QCA WCN36x0 WLAN Power Optimization Guide 80 Y0513 3 F
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QCA WCN36x0 WLAN Power Optimization Guide
80-Y0513-3 Rev. F
Confidential and Proprietary - Qualcomm Atheros, Inc.
Restricted Distribution: Not to be distributed to anyone who is not an employee of either Qualcomm or its subsidiaries without the express approval of Qualcomm's Configuration Management.
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Confidential and Proprietary - Qualcomm Atheros, Inc.
NO PUBLIC DISCLOSURE PERMITTED: Please report postings of this document on public servers or websites to: DocCtrlAgent@qualcomm.com.
Restricted Distribution: Not to be distributed to anyone who is not an employee of either Qualcomm or its subsidiaries of Qualcomm without the express approval of Qualcomm's
Configuration Management.
Not to be used, copied, reproduced, or modified in whole or in part, nor its contents revealed in any manner to others without the express written permission of Qualcomm Atheros, Inc.
Qualcomm is a registered trademark of QUALCOMM Incorporated. Atheros is a registered trademark of Qualcomm Atheros, Inc. All other registered and unregistered trademarks are the
property of QUALCOMM Incorporated, Qualcomm Atheros, Inc., or their respective owners and used with permission. Registered marks owned by QUALCOMM Incorporated and
Qualcomm Atheros, Inc., are registered in the United States of America and may be registered in other countries. Product descriptions contained herein are subject to change from time to
time without notice.
This technical data may be subject to U.S. and international export, re-export, or transfer ("export") laws. Diversion contrary to U.S. and international law is strictly prohibited.
Qualcomm Atheros, Inc.
1700 Technology Drive
San Jose, CA 95110
U.S.A.
© 2012-2013 Qualcomm Atheros, Inc.
–2–
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Revision History
Date
Description
A
Aug 2012
Initial release
B
Oct 2012
Updated WCN-SS Power Rails and Headswitches figure; expanded on description for Modulated DTIM and
missing beacon; updated testing
C
Oct 2012
Added WCNSS configuration guide; added references to WCNSS for Android and Windows
D
Dec 2012
Added PNO slides, MSM8974 WCN-SS Power Optimizations
E
Jan 2013
Updated Packet Filtering and ARP Offload and Driver Implementation sections
F
Feb 2013
Updated graphics on slides 6, 11, and 28; added information on WPM and descriptions of BET and miss
beacon; changed Riva to WCNSS
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Revision
–3–
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Table of Contents
WCN36x0 Power Management
Packet Filtering and ARP Offload
Power Management SW Architecture
Config Params
SW Component Hierarchy for Power Save
IOCTLs
Power Manager
IOCTL - WLAN_PRIV_SET_HOST_OFFLOAD Test with iwpriv
cCPU Clock Scaling
IOCTL - WLAN_SET_PACKET_FILTER_PARAMS
SVS Support
IOCTL - WLAN_SET_PACKET_FILTER_PARAMS – Test with iwpriv
ARM9 Clock Gating and Power Collapse with VDD MIN
Core BSP Resources Required
Wakeup Sequence – BT Schedule Activity
Enter Sleep Sequence
Exit Sleep Sequence
WLAN Power Save Mode (BMPS and IMPS)
Power Save Mode
Power Management Control
PMC Services
WCNSS Configuration Guide
BMPS
BMPS (Beacon Mode Power Save)
BMPS Listen Interval Negotiation
BMPS Sequence
Beacon Early Termination (BET)
Beacon Miss Detection
IMPS
IMPS (Idle Mode Power Save)
IMPS Sequence in Host
IMPS Sequence
Testing
ST
Driver Implementation
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Packet Filtering and ARP Offload – Driver Implementation
Call Graph - ARP Offload (config param)
Call Graph – ARP Offload (IOCTL)
Call Graph - MC/BC Packet Filtering (Config Param)
Call Graph - MC/BC Packet Filtering (IOCTL)
Call Graph - Packet Filter ALL and Allow Only from Registered
Addresses
Call Graph - Packet Filtering Based on Set Rules (IOCTL)
MC/BCering (Config Param)
Preferred Network Offloading (PNO)
PNO
Host-Affected Components
PNO Parameters
PNO Command Line Test
Integrate PNO in Android
MSM8974 WCN-SS Power Optimizations
Power Management Changes for MSM8974 WCN-SS
SPM (Subsystem Power Manager) Updates for MSM8974 WCN-SS
cMEM (Additional 64 KB) Updates for MSM8974 WCN-SS
uBSP in Low-Power Mode for MSM8974 WCN-SS
WLAN/BT Low-Power Mode for MSM8974 WCN-SS
References
Questions?
–4–
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
WCN-SS Power Rails and Headswitches
VDDmx is the memory voltage and
powers RAM blocks
VDDcx is the chip voltage and powers
digital (nonmemory) blocks
RPM controls the voltage of VDDcx and
VDDmx to satisfy the dynamic
requirements of all subsystems that share
access to these rails
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VDDCX
VDDMX
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WLAN_SS
Three blocks with isolated power control –
WLAN, Common, and Top (Always-On);
headswitches control power to WLAN and
Common
WMAC
PHY
Mem
Mem
WLAN software controls the headswitch
to WLAN block; shuts it down whenever
WLAN is idle
BT_HM
Subsystem Power Manager (SPM)
hardware block controls the headswitch to
common block
FM_HM
Common_SS
ARM9
Top
Mem
interrupt control
CMEM
Mem
clk, reset control
DXE (Common
DMA Engine)
Reg_initialization
Module
SPM/SAW2
GFS_CNTL
AHB
–5–
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WCN36x0 has an optional
48 MHz reference clock
that is required for WLAN
5 GHz operation.
WCNSS has its own
960 MHz PLL which is on
the GCC and provides the
clock source for much of
the WCNSS subsystem.
19.2 MHz clock from the
PMIC XO or 24 MHz clock
derived from an optional
crystal that is attached to
Iris - The PLL outputs both
a 960 MHz clock and a
480 MHz clock.
CGPLL is needed for
various Bluetooth and FM
analog components; it is
controlled by Power
Manager by Clock Regime
driver.
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WCN36x0 Clock
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WCN36x0 Clock (cont.)
48MHz XO on Iris
CGPLL
ST
The 48MHz XO on Iris is an optional crystal that, if present, can supply a 48MHz clock to
the WLAN RF. It is needed in order to support WLAN 80MHz mode.
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This PLL on Iris provides clocks to various Bluetooth and FM analog components; it will
be enabled and disabled by the Power Manager as needed when entering and exiting an
active BT or FM mode of operation; Power Manager will control the CGPLL via the Clock
Regime driver
cCPU Clock
The ARM9 (cCPU) clock is programmable to run at 240 MHz, 120 MHz, or 60 MHz; it is
controlled via the Clock Regime driver; Power Manager will dynamically change the
cCPU clock when it is notified of a change in the active wireless technology state
In order to achieve MIPS requirement targets, the CoreBSP sleep driver must restore the
cCPU clock frequency during wake to the same value it was when going to sleep
–7–
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WCN-SS HW – Power Rails
All rails to WCN3660 and WCNSS are controlled by RPM
No PMIC driver in WCNSS, i.e., no way for WCNSS to talk directly to PMIC
We use NPA Remoting to forward PMIC control via RPM
ST
PMIC NPA nodes will be provided by the PMIC driver team for each supply, and
control will be managed through these NPA nodes
All rails will be turned ON in the Wake Set from WCNSS and turned OFF in the
Sleep Set
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Including the 2.9V rail for the Transmit PA; very low leakage if PA is not used
WCN3660 requires that 1.8V SMPS I/O supply must come up before 1.3V
All the other supply domains (1.8V LDO, 1.2V and 2.9V) protect their inputs until 1.3V
supply comes up
Once 1.3V supply comes up, we release isolation by S/W control, assuming S/W knows
all the necessary supplies have been up
–8–
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RAM Leakage Reduction Modes
Description
ACTIVE
RAM block is being actively used (read/write)
DORMANT
• Standard Cell Power-Collapsed, Memory Periphery
Footswitched
• RAM contents are retained, but the RAM may not be
accessed (no read/write)
OFF
All contents of RAM are lost; leakage current is minimized
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RAM Mode
There are four memory blocks in WCNSS
cMEM and Cache on Common_SS
WMAC and PHY memories on WLAN_SS
–9–
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WCN-SS HW – GDHS and RAM Supply Rails
WCNSS SW will directly control the WLAN GDHS via register writes
The COMMON GDHS is controlled by SAW2 (SPM); SAW2 is configured by
register writes in the Sleep Driver
TOP is always on, but subject to non-functionality due to VDDmin
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Note: QGIC is actually in COMMON; requires save and restore of QGIC registers by the
Sleep Driver around power collapse
All RAM blocks support for low-power modes of operation
WLAN RAM will be directly controlled by WCNSS SW via register writes
COMMON RAM will be controlled by SAW2, which is configured by register writes in the
Sleep Driver
ACTIVE during wake
OFF during sleep (assumes that cMEM and cache contents are always lost during power collapse)
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All WCNSS clocks are
derived from the
960 MHz PLL in the
GCC, except during
sleep or the first steps
of the wakeup cycle
before the PLL is
enabled
For WLAN, the cCPU
clock frequency setting
is independent of the
phy clock setting; any
combination can be
used, as long as the
data rate requirements
are met
For BT, only the PLL
generated 32 MHz clock
is used for the link
controller
For FM, only the PLL
generated 19.2 MHz
clock is supported
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WCN-SS HW – Clocks
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WCN-SS HW – Clocks (cont.)
PMIC supplies 19.2 MHz reference clock and 32 kHz sleep clock
IRIS has an optional 48 MHz reference clock that is required for WLAN 5 GHz
operation
960 MHz PLL output is used to drive the WCNSS clock tree in operational mode
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Until PLL output is stable, WCNSS is clocked directly off the 19.2 MHz ref clk
32 kHz sleep clock drives all the WCNSS sleep logic and low-frequency timers
CGPLL on IRIS is used to drive modem, ADC/DAC, and WCN3660 digital blocks
for BT and FM; controlled by Power Manager SW by sending an SSBI command
to IRIS
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WCN-SS HW – Clocks (cont.)
960 MHz PLL will not be reprogrammed dynamically depending on connectivity mode of operation
List of system clocks generated from PLL (Note: Most clocks also run temporarily off the 19.2 MHz
XO during boot and wake)
WLAN_PHY_CLK (Root1_320_160_80)
Controlled by Power Manager
CLK_XO_19_2 (Root7_19_2)
Also shared with Coexistence; controlled by Power Manager
BT_FM_19_2_CLK (Root6_19_2)
Used for cCPU and AHB (AHB is always div2)
Divider selects between frequencies depending on MIPS requirements
Can change cCPU freq independent of all other technology clocks
Controlled by Power Manager
BT_CLK (Root5_32)
Divider selects between 240/120/60 MHz depending on WLAN BW Mode (20 MHz/ 40 MHz/ 80 MHz)
Controlled by Power Manager
CPU_CLK (Root3_240_120_60)
Divider selects from 320/160/80 MHz depending on WLAN BW Mode (20 MHz/ 40 MHz/ 80 MHz)
Controlled by Power Manager
WLAN_ADC_DAC_CLK (Root2_240_120_60)
ST
All required clocks are derived from this single PLL freq source
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This is the main clock that everything comes up on from boot; SPM also uses this
SLEEP_CLK (Root8_32_768K)
Used for a WLAN sleep timer and for BT sleep clock calibration (if needed)
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WCN-SS HW – Clocks (cont.)
The 48 MHz XO and GCC PLL are controlled by the sleep driver SW
The clock tree settings that exist on entry to sleep are restored upon exit from
sleep by the sleep driver
All requests for clocks are accomplished by function calls to the Clock Regime
driver
Clock Regime maintains and enforces dependencies
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Example: will control VDD NPA node to raise VDD to Nominal before switching cCPU to 240 MHz
Function calls to Clock Regime are blocking until complete
PM requests clocks that are shared between wireless technologies
WLAN_RFIF_CLK if it controls common HW (UART baud rate), need feedback
BT Clock (32 MHz) because it is shared with WLAN due to Coexistence
BT/FM Clock (19.2 MHz) because it is shared by BT and FM
cCPU Clock (120 MHz/240 MHz) because it is shared by everything
Other clocks that are technology-specific (i.e., all WLAN clocks) are requested by
the respective stack SW
– 14 –
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WCN-SS HW – Timers
There are 32 kHz local timers on both the collapsible COMMON and the alwayson TOP domains
BT_CLK needs to be saved and restored around power collapse
Configured in Power Manager since BT_CLK is also used in WLAN as part of
Coexistence
ST
Specific HW was added to accurately account for exact number of 32 kHz ticks spent in
sleep mode, used to resynchronize BT_CLK by SW
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WLAN_CLK needs to be saved and restored around power collapse
Also uses specific HW; is done in WLAN stack SW
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ST
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WCN36x0 Power Management
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Power Management SW Architecture
BT Stack
FM Stack
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WLAN Stack
Power Manager
NPA Sleep
RPM Driver
GDDS
Headswitch
Driver
CoreBSP Sleep
Timer Driver
Clock Regime
Driver
Power Management HW (SPM, Clocks/PLL, GDDS
headswitches, etc)
GCC Sleep
Timer
– 17 –
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SW Component Hierarchy for Power Save
ST
Individual stacks (WLAN, BT, FM) decide
when they can go idle for a period of
time
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Set a CoreBSP timer
Idle the HW specific to that technology (including
IRIS)
Notify the Connectivity Power Manager of the
mode change
Power Manager (PM) aggregates the modes
of all technologies, controls shared HW
resources, like cCPU clock, and in doing so,
configures NPA for sleep
RPM aggregates control over shared HW
resources across all MSM™ subsystems
– 18 –
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Power Manager
PM_WLAN_DISABLED
PM_WLAN_80MHZ_ENABLED_ACTIVE
PM_WLAN_80MHZ_ENABLED_INACTIVE
PM_BT_DISABLED
PM_BT_ENABLED_ACTIVE
PM_BT_ENABLED_INACTIVE
PM_BT_VOICE_ENABLED_ACTIVE
etc.
PM_FM_DISABLED
PM_FM_ENABLED_ACTIVE
PM_FM_AUDIO_ENABLED_INACTIVE
etc.
ST
Provides an API for WLAN/BT/FM modules to indicate a change in mode
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etc.
Abstracts the power management details from the WLAN/BT/FM modules
Co-locates all power management details in one module
Finds the least common denominator among all currently enabled modes
Sets LPRMs for LPRs registered with Sleep driver
Controls cCPU clock
– 19 –
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cCPU Clock Scaling
cCPU clock frequency is required to be 240 MHz for all BT Active modes and
WLAN Active mode
VDDcx must be at nominal level for cCPU to operate at 240 MHz
Clock Regime Driver includes NPA request to VDD_Dig node to ensure VDDcx is
at the correct level before setting cCPU clock to requested frequency
To minimize the RPM messages on a cCPU clock frequency change, the Power
Manager makes its own NPA request to the VDD_Dig node; this is bundled with
the request to the Internal Bus Driver in an NPA Transaction, which results in a
single message to the RPM that includes all requests generated by the VDD_Dig
request and Internal Bus Driver requests
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ST
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SVS Support
The default VDDcx voltage level is SVS
WCNSS will request a nominal voltage level if it requires the cCPU to operate at
240 MHz; cCPU operates at 240 MHz for all Bluetooth and WLAN Active modes
WCNSS will request a return to SVS voltage level once the mode that required the
240 MHz cCPU clock frequency is changed
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ARM9 Clock Gating and Power Collapse with VDD MIN
On cCPU entering Idle thread, there are only two expected options for the state to
enter
The first of these is ARM9 Clock Gating; this state is entered when the next
expected wake time is too close to the current time, or when the PM has disabled
GDHS; ARM9 Clock Gating mode gates the cCPU clock to the ARM9; no other
hardware is turned off
The PM uses an NPA node provided by the Sleep Driver to disable GDHS; this is
done based on the Power Manager mode set by each technology
If there is enough time until the next expected wakeup, the Power Collapse with
VDD min state is entered
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ST
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Core BSP Resources Required
Clock Regime Driver
CPU clock frequency changes are requested through /clk/cpu NPA node
All other clocks needed by WCNSS are configured using the DAL Clock API
Handles the switch to/from the IRIS 48 MHz XO on power collapse entry/exit
ST
Sleep Driver
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GDHS Disable requests are made using the /core/cpu/vdd NPA node
Configures RPM’s Sleep set for WCNSS/Iris voltage supplies
Internal Bus Driver
Bus bandwidth requests are made through the icbarb API, which uses the /icb/arbiter NPA
node
Bus Bandwidth requests are made based on PM mode changes
PMIC NPA
The PM uses PMIC NPA nodes to request the voltage supplies to be placed in the RPM’s
active set
PMIC Driver used to communicate directly with PMIC does not exist on WCNSs
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Wakeup Sequence - BT Scheduled Activity
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ST
WCN36x0
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Enter Sleep Sequence
Enter Sleep
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cCPU
ST
CoreBSP Sleep Driver sends RPM resource set change, and RPM sleep timer value for scheduled wake time
CoreBSP Sleep Driver configures SPM for sleep
CoreBSP Sleep Driver uses Clock Regime driver to set clock gen MUX to 19.2M output
CoreBSP Sleep Driver uses Clock Regime driver to disable 960 MHz PLL (clears bit in GCC)
RPM/MPM
SPM
CoreBSP Sleep Driver uses Clock Regime driver to configure Iris clock plan and disable 48M XO (if used)
CoreBSP Sleep Driver saves state of cCPU in DDR RAM, executes SWFI
SPM asserts Common reset
SPM enables Common isolation
SPM disables Common clocks
SPM drives cMEM into retention mode (if required)
SPM disables headswitch to Common
SPM notifies RPM is in sleep state
RPM grants sleep request
RPM takes down Iris voltage sources
RPM instructs MPM to set VDDcx & VDDmx to proper levels
MPM changes VDDcx and VDDmx from nominal to retention (or off) levels
MPM disables 19.2M PMIC XO buffer
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Exit Sleep Sequence
SPM enables Common headswitches
SPM drives cMEM into functional mode
SPM enables Common clocks
SPM disables Common isolation
SPM de-asserts Common reset
ST
MPM Changes VDDcx and VDDmx from retention/off to nominal levels (1.05V)
MPM Enables RPM
RPM Sends wakeup to SPM
SPM issues bringup_req to RPM
RPM brings up Iris voltage sources
RPM issues bringup_ack to SPM
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RPM/SPM
MPM
Exit Sleep
MPM Timer Expires (t = 0)
MPM Enables 19.2M PMIC XO buffer
cCPU
cCPU executes warm boot code in CoreBSP, OS restores context from DDR, and returns to the SWFI instruction
CoreBSP Sleep Driver uses Clock Regime driver to configure Iris clock plan and enable 48M XO (if used)
CoreBSP Sleep Driver uses Clock Regime driver to enable 960MHz PLL (sets bit in GCC)
CoreBSP Sleep Driver uses Clock Regime driver to set clock gen MUX to PLL output
CoreBSP Sleep Driver restores local Sleep Timer by reading MPM counter
CoreBSP Sleep Driver umasks interrupts; cCPU processes interrupt
– 26 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
ST
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WLAN Power Save Mode (BMPS and IMPS)
– 27 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
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ST
Android Power Save Mode
– 28 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Power Management Control
PMC features
Part of the Station Management Entity (SME)
Designed to be independent of the OS platform
Independent of a target hardware device to accommodate future products
Provides services to HDD, CSR, QoS and other driver modules
Uses vOSS and PE/HAL services to accomplish power management-related tasks
ST
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– 29 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
PMC Services
Driver modules can use these PMC services
Query the current Power Save state of the system
Request to enter a specific Power Save mode, e.g., IMPS and BMPS
Request Full Power
Disallow entry into Power Save modes
Control Power Save modes, wakeup cycles, etc. by updating the config
Signal power-related events, e.g., hibernate, etc.
ST
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– 30 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Power-Save FW
Aggregate votes (from
the clients using API)
and their modes of
operation
Four states exist in
WPM:
RXONLY
ACTIVE
Low_pwr1: BMPS
Low_pwr2: IMPS or no
vote from any clients
ST
WPM (WLAN Power
Manager)
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– 31 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
WCNSS Configuration Guide
Name
gEnableImps
Default
1
1
gBmpsMinListenInterval
gBmpsModListenInterval
gBmpsMaxListenInterval
gEnableModulatedDTIM
gEnableDynamicDTIM
gTelescopicBeaconWakeupEn
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ST
gEnableBmps
Description
Enable Idle Mode Power Save
1 – Enable
0 – Disable
Enable Beacon Mode Power Save
1 – Enable
0 – Disable
Default Configure DTIM
1 – Min
65535 – Max
Use Modulated DTIM
0 – Disable
5 – Max
Use Dynamic DTIM
0 – Disable
5 – Max
Use Tele-DTIM
0 – Disable
1 – Enable
Configure Tele-DTIM
For Interval: 1 – Min 7 – Max
For NumIdleBcns 5 – Min 255 – Max
telescopicBeaconTransListenInterval
telescopicBeaconTransListenIntervalNumIdleBcns
telescopicBeaconMaxListenInterval
telescopicBeaconMaxListenIntervalNumIdleBcns
1
0
0
0
3
10
5
15
See Q2 and Q3 for more information.
– 32 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
ST
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BMPS
– 33 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
BMPS (Beacon Mode Power Save)
In WCNSS_qcom_cfg.ini
gEnableBmps = 1
Associated with an access point and no traffic in Tx or Rx
WLAN digital domain is power-collapsed along with the corresponding domain in
the WCN3660 chipset; if no other connectivity technology (BT or FM) is active, the
entire WCN subsystem is power-collapsed
BMPS Enter trigger can come from two places
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ST
HDD - WLAN host device driver
PMC – WCNSS FW autonomously may decide to put the system in BMPS mode
Wake up every Listen/DTIM interval to listen to Beacon to check DTIM information
to retrieve packets buffered at AP and check capability information
BMPS Exit trigger can come from
Explicit Exit indication from HDD
WCNSS FW can decide to bring the chip out of BMPS
WCNSS FW is responsible for putting the chip back to BMPS
– 34 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
BMPS Listen Interval Negotiation
gBmpsMinListenInterval
gBmpsModListenInterval
gBmpsMaxListenInterval
ST
If gIgnoreDtim isn’t set, set the LI using
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Use gPowerUsage to identify which listen interval to use
DTIM = AP interval
Listen Interval Calculation
1) If DTIMs ≤ LI then LI = DTIMs.
2) ELSE
(1) If DTIMs is divisible by LI then LI will not be changed.
Example: a. LI=4 and DTIMs=8, LI=4. b. LI=3 and DTIMs=6, LI=3
(2) If DTIMs is not divisible by LI, then from GCD to LI, get the biggest value that can divide
the DTIMs.
Example: a. LI=4 and DTIMs=9, LI=3 b. LI = 7 and DTIMs = 12, LI = 6
– 35 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
BMPS Listen Interval Negotiation (cont.)
Set gEnableModulatedDTIM = MDTIM
Modulate DTIM
When the system is in suspend (maximum beacon will be at 1s == 10)
If maxModulatedDTIM ((MAX_LI_VAL = 10) / DTIMs) equal or larger than MDTIM (configured in
WCNSS_qcom_cfg.ini)
Set LI to MDTIM * DTIM
If Dtim = 2 and Mdtim = 2 then LI is 4
Else
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ST
Set LI to maxModulatedDTIM * DTIMs
When the system wakes up
Set LI to DTIM
– 36 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
BMPS Listen Interval Negotiation (cont.)
gIgnoreDtim = 1
ignoreDtim
Ignore DTIM interval; set the current LI
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ST
Use the gEnableDynamicDTIM = a
Dynamic DTIM
When the system into the suspend – LCD off
Reconfigure power parameters (DTIMa)
Exit BMPS
Re-enter BMPS so that WCNSS takes into account the DTIMa
When the system wakes up
Reconfigure power parameters (DTIM1)
Exit BMPS
Re-enter BMPS so that WCNSS takes into account the DTIMa
– 37 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
BMPS Listen Interval Negotiation (cont.)
Set gTelescopicBeaconWakeupEn = 1
x = count how long it stays in that node without packet
l1 = telescopicBeaconTransListenIntervalNumIdleBcns
l2 = telescopicBeaconMaxListenIntervalNumIdleBcns
x > l2 & !packet
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x > l1 & !packet
x <= l2 & !packet
x <= l1 & !packet
packet
LI1
LI2
packet
Telescopic DTIM
ST
LI3
Start with interval of 1
Stay in interval of 1 for telescopicBeaconTransListenIntervalNumIdleBcns amount
If no data during that period move to telescopicBeaconTransListenInterval interval
Stay in this interval for telescopicBeaconMaxListenIntervalNumIdleBcns amount
– If no data during that period move to telescopicBeaconMaxListenInterval
If data is presented, move back to interval of LI1
If two consecutive beacons are missed, move back to interval of LI1
After first beacon miss, it tries to receive the next earliest arriving beacon
See Q1 for more information.
– 38 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
BMPS Sequence
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ST
HAL
– 39 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Beacon Early Termination (BET)
Terminate the reception of beacon if the TIM element is clear for the power saving
BET can be configured in a WCNSS configuration file
BET is supported only in 2.4 Ghz for Infra STA case
For P2P Client BET is disabled as FW has to parse NOA attributes in Beacon
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ST
Beacon Early Termination (BET) Config
(‘enableBeaconEarlyTermination=1’)
beaconEarlyTerminationWakeInterval=3
beaconEarlyTerminationWakeInterval=9
beaconEarlyTerminationWakeInterval=10
Behavior
Every 2nd Beacon is a Non-BET beacon and hence
has longer active duration
Every 4th Beacon is a Non-BET beacon and hence
has longer active duration
Every 5th Beacon is a Non-BET beacon and hence
has longer active duration
– 40 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Beacon Miss Detection
Maintains a circular buffer with Beacon wait times for last 50 beacons
Pick a maximum value from the buffer and use it as next timeout period for
receiving beacon (range: ucMinBcnWaitTU, ucMaxBcnWaitTU)
Beacon Wait Window extends with consecutive beacon misses
Beacon window is flexible for APs with good and poor connectivity
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ST
Beacon window extension with consecutive bcn misses
– 41 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
ST
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IMPS
– 42 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IMPS (Idle Mode Power Save)
To enable, in WCNSS_qcom_cfg.ini
gEnableImps = 1
ST
Station is not connected to AP
CSR requests PMC enter IMPS between scans
IMPS exit or does not start during
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Idle scan is disabled
Device stays in IMPS until it is explicitly requested to exit that mode
Entry/exit from this mode is triggered by host software
WLAN register contents need to be restored upon exiting this mode
Hardware state
WLAN hardware domain is power-collapsed
WCNSS common may or may not be power-collapsed based on the scan
– 43 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IMPS (cont.)
Station looks in its existing profile list and sends a probe request, with SSID
specified in profile
Station repeats process and continues to repeat steps until it is associated with an
AP
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ST
– 44 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IMPS Sequence in Host
PMC
CSR
PE
HAL
WDI
WDA
pmcRequestImps
eWNI_PMC_ENTER_IM
PS_REQ
pmcEnterImpsState
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Check if:
Imps Enabled/Imps Allowed/Not already in IMPS
ST
(pTimeInterval)
Check if:
Not associated/ PE in IDLE state
WDA_ENTER_IMPS_REQ
pmmImpsSendChangePwr
SaveMsg
Populate ADU Register List
Any
Request
for Full
Power
will be
deferred
WDI_EnterImpsReq
WDA_ProcessEnterImpsReq
WLAN_HAL_ENTER_IMPS_REQ
WDI_2_HAL_REQ_TYPE
halPS_SetListenIntervalParam:
Set interval to config
WLAN_HAL_ENTER_IMPS_
RSP
eWNI_PMC_ENTER_IM
PS_RSP
WDA_ENTER_IMPS_RSP
halPS_HandleFwEnterImpsRsp
HAL_2_WDI_RSP_TYPE
WDA_EnterImpsReqCallback
pmmEnterImpsResponseHan
dler
If request for full power is pending
start wakeup procedure
Success/False
pmcProcessResponse
– 45 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IMPS Sequence in WCNSS
SLM
WLAN HW
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ST
HAL
QWLANFW_HOST2FW_ENTER_IMPS_REQ
halPS_HandleEnterImpsReq
Update ADU register List
Configure HW for IMPS mode
QWLANFW_ERR_STATUS_OK \
QWLANFW_ERR_MBOX_SEND_MSG_FAILURE
slmPsImpsPwrDownSeq
eHAL_STATUS_SUCCESS \
eHAL_STATUS_FAILURE
halPS_HandleFwEnterImpsRsp
– 46 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Testing
Almost all the target numbers are calculated on screen room
Only one client connected to AP
No noise generated
Broadcast/multicast filter is on
It is performance-configured (many apps and debug features are turned off)
During BMPS and IMPS
ST
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In default, Android wakes up the host every 5 min in IMPS
In default, Android wakes up the host every 30 min in BMPS
During those modes, if the current consumption goes up to 70mA and stays there for
more than 1 sec, it could be app processor not going to suspend mode
WCNSS should not exceed 2 % of usage during those modes
Disconnect JTAG and USB during your current measurement
DTIMx
x indicates what interval it is. x = 1 then 100 ms each beacon during BMPS
– 47 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Testing (cont.)
Capture kernel log with iwpriv enabled
SME: Iwpriv wlan0 setwlandbg 6 8 1
WDA: Iwpriv wlan0 setwlandbg 8 8 1
HDD: Iwpriv wlan0 setwlandbg 5 4 1
Capture powertop log
This will display the extra log message
ST
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To see what kind of process is running at that moment and processor speed
Capture tcpdump
To debug what kinds of packets trigger apps processor to wake up
In ADB shell
tcpdump -i any -s 0 -w /data/ip2.pcap
– 48 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
ST
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Packet Filtering and ARP Offload
– 49 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Packet Filtering and ARP Offload
Packet Filtering
There are two different types of Packet Filtering
ST
Filter received Multicast/Broadcast packets completely without passing them to host driver
Filter received Multicast/Broadcast packets selectively based on set rules
ARP Offload
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Host offloads the process of sending ARP response messages
WCNSS sends ARP response messages
WCNSS_qcom_cfg.ini contains config params for Packet Filtering and ARP
Offload
Whenever the system is going into early suspend (screen off), wlan driver will apply the filters
Whenever the system is moving out of suspend (late resume) these filters will be cleared
– 50 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
ARP Offload and Packet Filtering during Concurrency
WCNSS stays in Active mode during concurrency (STA + P2P Client or STA +
P2PGo)
WCNSS Active mode Offloads is Disabled
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ST
Config param gEnableActiveModeOffload=0
ARP offload and MC filtering is done in WCNSS when phone enters Suspend mode and
when WCNSS is in BMPS mode of operation
This implies that ARP offload and MC filtering will not happen during concurrency if
WCNSS Active mode Offloads is disabled
WCNSS Active mode Offloads is Enabled
Config param gEnableActiveModeOffload=1
ARP offload and MC filtering becomes independent of the BMPS mode
ARP offload and MC filtering works even in WCNSS Active mode
This implies that ARP offload and MC filtering will happen during concurrency if WCNSS
Active mode Offloads is enabled
– 51 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Packet Filtering and ARP Offload – Config Params
The following Config Params are supported in WCNSS_qcom_cfg.ini
Functionality
Allowed Values
mcastBcastFilter
To filter Mcast / Bcast Rx packets
completely
0: No filtering
1: Filter all Multicast.
2: Filter all Broadcast.
3: Filter all Mcast and Bcast
hostArpOffload
To enable HostARPOffload feature so
that ARP response will be sent
0 – Disable
1 – Enable
isMcAddrListFilter
To allow Mcast RX packets from
registered addresses only and filter
remaining Mcast and Bcast Rx packets
0 – Disable
1 - Enable
ST
Config param
in ini
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If gEnableActiveModeOffload=1 following will be the behavior during concurrency
Concurrent Mode
STA + P2P Client
STA + P2P GO
ARP Offload
hostArpOffload=1
ARP Offload is enabled
for STA and P2P Client
modes.
ARP Offload is enabled
for STA mode Only.
MCPacket Filtering
isMcAddrListFilter=1
Packet Filtering is
enabled for both STA and
P2P Client modes
Packet Filtering is
enabled for STA mode
ONLY.
– 52 –
MCBC Filtering
McastBcastFilter=0
Currently Not Supported
in concurrency.
Currently Not Supported
in Concurrency.
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Packet Filtering and ARP Offload – Config Params (cont.)
mcastBcastFilter
0: No filtering 1: Filter all Multicast.
2: Filter all Broadcast. 3: Filter all Mcast and Bcast
hostArpOffload
0 – Disable 1 – Enable
isMcAddrListFilter
0 – Disable 1 - Enable
isMcAddrListFilter
ST
Allowed Values
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mcastBcastFilter
Config param in ini
hostArpOffload
0
1
2
3
0
0
0
0
0
1
0
0
0
0
0
1
2
1
1
3
0
1
2
3
1
0
0
0
0
0
1
1
1
2
1
1
1
1
3
1
1
0
0
0
1
1
1
1
Expected Behavior
Multicast Packets
Broadcast Packets
Filtered by FW/HW
Filtered by
FW /HW
NO
NO
YES
NO
NO
YES
YES
YES
YES – Except for the
YES
registered Addresses
YES
YES
YES – Except for the
YES
registered Addresses
YES
YES
NO
NO
YES
NO
NO
NO
YES
NO(filter internally
set to MC only)
YES – Except for the
YES
registered Addresses
YES
YES
YES – Except for the
YES
registered Addresses
YES
YES
– 53 –
ARP Rsp
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Packet Filtering and ARP Offload - IOCTLs
ST
The following IOCTLs are available to set Packet Filtering and ARP Offload
features
IOCTL
WLAN_PRIV_SET_MCBC_FILTER
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Functionality
To filter Mcast/Bcast RX packets completely
WLAN_PRIV_CLEAR_MCBC_FILTER
To clear the filters for Mcast/Bcast RX packets
WLAN_PRIV_SET_HOST_OFFLOAD
To enable HostARPOffload feature so that ARP response
will be sent. This IOCTL can also be used for Neighbor
Discovery Offload.
WLAN_SET_PACKET_FILTER_PARAMS
To filter Mcast and Bcast RX packets selectively based
on filter params
– 54 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IOCTL - WLAN_PRIV_SET_HOST_OFFLOAD
IOCTL WLAN_PRIV_SET_HOST_OFFLOAD can be used for ARP Offload or
Neighbor Discovery Offload
Input Params
Offload Type
0 - WLAN_IPV4_ARP_REPLY_OFFLOAD
1 - WLAN_IPV6_NEIGHBOR_DISCOVERY_OFFLOAD
Enable Or Disable Flag
0 - WLAN_OFFLOAD_DISABLE
0x1 - WLAN_OFFLOAD_ENABLE
WLAN_OFFLOAD_ARP_AND_BC_FILTER_ENABLE
It is valid only in the context of ARP Offload type
Its value is (WLAN_OFFLOAD_ENABLE | WLAN_OFFLOAD_BC_FILTER_ENABLE)
0x2 - WLAN_OFFLOAD_BC_FILTER_ENABLE
If Offload Type is ARP and the request is for Enable
IPV6 Address
IPV4 Address
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ST
If Offload Type is Neighbor Discovery and the request is for Enable
Refer wlan_hdd_host_offload.h for more details
– 55 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IOCTL - WLAN_SET_PACKET_FILTER_PARAMS
WLAN_SET_PACKET_FILTER_PARAMS
Packet Filtering feature enables FW to filter multicast and broadcast packets and send
only those packets that match the configured filter rules up to the host SW even when the
Host is active
Provides flexibility to filter intended multicast and broadcast packets at reception in STA
Active mode
Received packets that do not match the filter rules set will be dropped and not sent to
host
Unicast frames will unconditionally be sent to host
Parameters are configured dynamically through a private IOCTL
ST
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– 56 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IOCTL - WLAN_SET_PACKET_FILTER_PARAMS (cont.)
Packet Filtering IOCTL requires input parameters
filterAction – Enum Type To Set and Clear filters
filterId – ID of the filter
numParams – Number of parameters/frame headers to add for filtering
paramsData – Array of structures with protocol layer header, comparison flags & data
fields corresponding to the header as below
ST
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protocolLayer – Type of protocol layer header to which the data being configured correspond
cmpFlag – Comparison type
dataOffset – Offset of the data to compare from the respective protocol layer header start (as per
the respective protocol specification) in terms of bytes
dataLength – Length of data to compare
compareData – Array of 8 bytes
dataMask – Mask to be applied on the received packet data (array of 8 bytes)
– 57 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IOCTL - WLAN_SET_PACKET_FILTER_PARAMS (cont.)
Possible values for the input parameters
filterAction can have 2 valid values
filterId can have the following possible values
filterId = 0 to 9
Elements of paramsData structure can take the following values
filterAction = 1 means to set the filter
filterAction = 2 means to clear the filter
ST
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protocolLayer = 1 for MAC header
protocolLayer = 2 for ARP header
protocolLayer = 3 for IP header
cmpFlag can have the following values
cmpFlag = 0 means comparison is invalid
cmpFlag = 1 means compare for equality of the data present in received packet to the
corresponding configured data
cmpFlag = 2 means for equality of the data present in received packet to the corresponding
configured data after applying the mask
cmpFlag = 3 means compare for non-equality of the data present in received packet to the
corresponding configured data
cmpFlag = 4 means compare for non-equality of the data present in received packet to the
corresponding configured data after applying the mask
cmpFlag can be programmed with any of the above values in such a way that received frames can
selectively be allowed to host or dropped at FW
– 58 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IOCTL - WLAN_SET_PACKET_FILTER_PARAMS (cont.)
ST
Example (1) – Add a filter for IPv6 multicast packets (multicast address starting
with 0x33 33) at FW even when host is in Active mode and FW will allow/push
the packets matching with this filter to host. All other data packets received which
do not fall into this filter category will be dropped by FW and will not be allowed to
host
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With filterAction = 1, filterId = 2, numParams = , 2paramsData [0]. protocolLayer = 1,
paramsData [0].cmpFlag = 3, paramsData [0].compareData = 0x333300000000,
paramsData [0].dataMask = 0xFFFF00000000, paramsData [0].dataOffset = 4,
paramsData [0]. dataLength = 6 ; paramsData [1]. protocolLayer = 1, paramsData
[1].cmpFlag = 1, paramsData [1].compareData = 0x86DD, paramsData [1]. dataLength
= 2 & paramsData [1].dataOffset = 34,
– 59 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IOCTL - WLAN_SET_PACKET_FILTER_PARAMS (cont.)
Example (2) – To drop IPv6 multicast frames with IP address range as FFxx::\16
at FW, the filter need to be configured as follows
filterAction = 1
filterId = 7 (can be any value from 0 to 9)
numParams = 4
paramsData [0]. protocolLayer = 2, paramsData [0].cmpFlag = 3, paramsData
[0].dataOffset = 6, paramsData [0]. dataLength = 2 , paramsData [0].compareData =
0x86DD, paramsData [0].dataMask = 0x0
paramsData [1]. protocolLayer = 3, paramsData [1].cmpFlag = 4, paramsData
[1].dataOffset = 24, paramsData [1]. dataLength = 2, paramsData [1].compareData =
0xFF, paramsData [1]. dataMask = 0xFF
paramsData [2]. protocolLayer = 3, paramsData [2].cmpFlag = 3, paramsData
[2].dataOffset = 28, paramsData [2]. dataLength = 8, paramsData [2].compareData =
0x0, paramsData [2].dataMask = 0x0
paramsData [3]. protocolLayer = 3, paramsData [3].cmpFlag = 3, paramsData
[3].dataOffset = 36, paramsData [3]. dataLength = 4 , paramsData [3].compareData =
0x22, paramsData [3].dataMask = 0x0
ST
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– 60 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
IOCTL - WLAN_SET_PACKET_FILTER_PARAMS - Test with iwpriv
Command to set filter to drop ipv4 MC (address range :- 224.0.0.0 to
239.255.255.255) by using mask not equal(4)
Command that clears above ipv4 MC filter
adb shell iwpriv wlan0 setPktFilter 2 8 1 3 4 16 1 224 0 0 0 0 0 0 0 240 0 0 0 0 0 0 0 0 0 0
000000000000000000
Command to set filter to drop ipv6 MC (address range :- FFxx::\16) by using not
equal(3) and mask not equal(4)
adb shell iwpriv wlan0 setPktFilter 1 8 1 3 4 16 1 224 0 0 0 0 0 0 0 240 0 0 0 0 0 0 0 0 0 0
000000000000000000
ST
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adb shell iwpriv wlan0 setPktFilter 1 7 4 2 3 6 2 134 221 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 4 24
2 255 0 0 0 0 0 0 0 255 0 0 0 0 0 0 0 3 3 28 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 3 36 4 0 0
0 22 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Command that clears the ipv6 MC filter
adb shell iwpriv wlan0 setPktFilter 2 7 4 2 3 6 2 134 221 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 4 24
2 255 0 0 0 0 0 0 0 255 0 0 0 0 0 0 0 3 3 28 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 3 36 4 0 0
0 22 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
– 61 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
ST
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Driver Implementation
– 62 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Packet Filtering and ARP Offload – Driver Implementation
Whenever the system goes into early suspend (screen off), wlan driver will apply
the filters based on config params
Based on ini params appropriate function is called in early suspend to filter
packets
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hdd_conf_hostarpoffload() - To enable ARP Offload feature
wlan_hdd_set_mc_addr_list() - To allow Mcast RX packets from registered addresses
only and filter remaining Mcast and Bcast Rx packets
sme_ConfigureSuspendInd() - To filter Mcast / Bcast Rx packets completely
– 63 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Call Graph - ARP Offload (config param)
ST
Call Graph for setting ARP Offload feature through ini param hostArpOffload
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– 64 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Call Graph - ARP Offload (IOCTL)
ST
Call Graph for setting ARP Offload feature through IOCTL
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– 65 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Call Graph - MC/BC Packet Filtering (Config Param)
ST
Call Graph for filtering Mcast/Bcast pkts completely through ini param
mcastBcastFilter
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– 66 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Call Graph - MC/BC Packet Filtering (IOCTL)
Call Graph for filtering Mcast/Bcast pkts completely through IOCTL
The above function call flow will happen if WLAN is already in suspended state
Otherwise the filter is set as part of next suspend event
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ST
Similar to the call graph corresponding to ini param mcastBcastFilter
– 67 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Call Graph - Packet Filter ALL and allow only from Registered
Addresses
ST
Call Graph for filtering ALL Mcast/Bcast pkts except the Mcast pkts from
registered addresses when isMcAddrListFilter is set
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– 68 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Call Graph - Packet Filtering Based on Set Rules (IOCTL)
ST
Call Graph for filtering Mcast/Bcast pkts based on set rules through IOCTL
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– 69 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
ST
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Preferred Network Offloading (PNO)
– 70 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
PNO
PNO enables a high-level application to request the WLAN firmware to look for
networks of choice in an efficient manner.
The user application can save a list of preferred SSIDs.
WCNSS FW software scans for such SSIDs based on a higher level application
request, provided that the system is in the early suspended state, which enables
aCPU to preserve power while WCNSS looks for a preferred network.
WCNSS will notify aCPU if any of the saved SSIDs are found OTA.
Private IOCTL is exposed from driver to enable/disable PNO.
The PNO default scan interval is 5 seconds if the PNO scan timer is not set.
PNO scans for preferred networks start at aCPU early suspend state and stop as
soon as aCPU in late resume state.
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ST
– 71 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Host-Affected Components
ST
PNO code is featurized with the FEATURE_WLAN_SCAN_PNO flag
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– 72 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Host-Affected Components (cont.)
HDD
Exposes configuration IOCTL to set up preferred network list either via private IOCTL
with “pno” command or via extended private IOCTL, WLAN_SET_PNO
(SIOCIWFIRSTPRIV + 24)
Sends IWEVCUSTOM event to supplicant to notify preferred network found
wlan_hdd_wext.c
ST
iw_set_pno function handle PNO requests
found_pref_network_cb function sends IWEVCUSTOM event to supplicant
SME
Updates scan parameters to WCNSS initially and as soon as changes occur
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csrApiScan.c, pmcUpdateScanParams in csrApplyChannelPowerCountryInfo when changes occur
Posts WDA_SET_PNO_REQ message to WDA module with PNO settings
Callback HDD when getting indication eWNI_SME_PREF_NETWORK_FOUND_IND with
preferred network found
WDA/WDI
Sends PNO request to WCNSS via SMD
Handles WDI_PREF_NETWORK_FOUND_IND indication from WCNSS when preferred
network found and sends message eWNI_SME_PREF_NETWORK_FOUND_IND to
SME
– 73 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
PNO Parameters
: SSID length of the preferred network
: Preferred network SSID
: Authentication (0 – any authentication). Please refer to wlan_hal_msg.h, tAuthType
type
: Encryption (0 – any encryption). Please refer to wlan_hal_msg.h, tEdType type
: Number of channels. If 0 is mentioned, then all 2.4G/5G channels will be scanned.
: Channel number to scan. If 0 is set for , then this can be skipped
: preferred SSID is broadcast or hidden.
ST
: 0- disable, 1- enable
: Number of networks in preferred list
For each network
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0: Don’t know: Broadcast probe will be send first and if no probe response is received then a directed Probe
request will be send
Broadcast: Only broadcast Probe requests will be send
Hidden: Only directed Probe requests for that SSID will be send
: RSSI threshold, beyond this RSSI value the network will not be reported to APPS
: Number of scan timers. Max number of scan timers is 10.
For each scan timer
: scan interval in secs
: Number of times to scan using the scan interval. 0 means scan continuously till PNO
disabled
: 1 – to start PNO when aCPU in early suspend state and stop when in late resume
state
– 74 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
PNO Command Line Test
adb shell iwpriv wlan0 setpno "1 1 5 Prima 0 0 3 1 6 11 0 90 2 45 8 300 0 1"
‘1’: Enable PNO
‘1’ :1 network in preferred list
‘5’: SSID “Prima” length is 5
‘4’: ‘Prima’ as preferred network SSID
‘0’: any authentication
‘0’: any encryption
‘3’: Number of channels is 3 as channel 1, 6 and 11.
‘1 6 11’: scan channel 1, 6 and 11
‘0’: Don’t know: Broadcast probe is sent first, and if no probe response is received, then a
directed Probe request is sent
‘90’: RSSI threshold as -90
‘2’: Number of scan timers is 2
‘45’: First timer scan interval is 45 seconds
‘8’: scan 8 times every 45 seconds
‘300’: Second timer scan interval is 300 seconds
‘0’: scan every 300 seconds until PNO is disabled
‘1’: PNO scan to work in aCPU late suspend mode
ST
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– 75 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Integrate PNO in Android
Android framework has background scan implementation which relies on Wifi
PNO or RTC timer itself to scan periodically for preferred network
Set config_wifi_background_scan_support flag in
frameworks/base/core/res/res/values/config.xml to define using Wifi PNO or RTC timer
periodic wakeup scan
true: wifi chipset supports background scanning mechanism (PNO); this mechanism allows the
host to remain in suspend state and the wlan firmware to actively scan and wake the host when a
configured SSID is detected; set to true to use Wifi PNO
false: default value; use RTC timers to do periodic wakeup scan
wpa_supplicant has android_pno_start and android_pno_stop function attached
to framework to enable and disable PNO
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ST
In external/wpa_supplicant_8/src/drivers/driver_nl80211.c, customers have to change
these functions’ implementation for WCN solution PNO parameters
wpa_supplicant has to handle custom event received from driver
Customers have to modify wpa_supplicant to handle the event accordingly
– 76 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
ST
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MSM8974 WCN-SS Power Optimizations
– 77 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Power Management Changes for MSM8974 WCN-SS
SPM (Subsystem Power Manager)
cMEM
ST
SPM controls the IRIS XO, PLL
Limit access to the MSM DDR during low-power mode of operation
Increase the cMEM size by an additional 64 KB
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Total cMEM is 120 KBytes (56 KB + 64 KB)
uBSP running from cMEM to support WLAN BMPS and BT LPPS operations
– 78 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
SPM (Subsystem Power Manager) Updates for MSM8974 WCN-SS
Change to the warm-boot sequence
Wakeup from RPM/aCPU triggers SPM
SPM starts the power-up sequence
ST
SPM performs handshake with RPM to request resources
RPM enables WCN resources and acknowledges the request
SPM configures 5-wire WLAN GPIOs to prepare the 48 MHz Iris XO
SPM configures WCN36x0 clock plan and enables the 48 MHz XO (if used)
SPM enables WCN-SS 960 MHz PLL
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ARM9 starts fetching instructions from DDR/cMEM
– 79 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
cMEM (additional 64KB) Updates for MSM8974 WCN-SS
Minimize DDR access to
reduce the power
consumption in the lower
power mode (WLAN
BMPS and BT LPPS)
uBSP code will run in
cMEM space in the
lower-power mode
ST
Low-Power Mode
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Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
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ST
uBSP in Low-Power Mode for MSM8974 WCN-SS
– 81 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
WLAN/BT Low-Power Mode for MSM8974 WCN-SS
WLAN Low-power mode
WLAN BMPS mode handling in cMEM
ST
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TIM SET (Unicast Data Pending) – Fetch the instructions from DDR
DTIM SET (B/Mcast Data Pending) – Fetch the instructions from
DDR
TIM CLEAR – Power Down (no instruction fetching from DDR)
BT Low-power mode
BT LPPS (Low-Power Page Scan) handling in cMEM
1.28 Seconds Timer Interrupt
– 82 –
Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
References
Ref.
Document
Qualcomm
Application Note: Telescopic Beacon Wakeup
Q2
WCNSS Android™ Configuration Guide
Q3
WCNSS Windows Configuration Guide
80-N7461-1
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ST
Q1
80-N8140-1
80-N5047-23
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Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
ST
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Questions?
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Confidential and Proprietary - Qualcomm Atheros, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-Y0513-3 Rev. F
Source Exif Data:
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Title : QCA WCN36x0 WLAN Power Optimization Guide
Creator : QCA
Description : 80-Y0513-3 Rev. F
Producer : Adobe PDF Library 10.0
Company : Qualcomm Inc.
DC Nand Rev : 80-Y0456-x Rev. A
Dvar Proprietary 0 : Qualcomm Confidential and Proprietary
Dvar Proprietary 1 : Qualcomm Flarion Technologies Confidential and Proprietary
Dvar Permissions 0 : Not to be used, copied, reproduced in whole or in part, nor its contents revealed in any manner to others without the express written permission of Qualcomm.
Dvar Permissions 1 : Not to be used, copied, reproduced in whole or in part, nor its contents revealed in any manner to others without the express written permission of QUALCOMM Incorporated/QUALCOMM Israel Ltd.
Dvar Permissions 2 : Not to be used, copied, reproduced in whole or in part, nor its contents revealed in any manner to others without the express written permission of QUALCOMM (UK) Limited.
Dvar Permissions 3 : Not to be used, copied, reproduced in whole or in part, nor its contents revealed in any manner to others without the express written permission of QUALCOMM Incorporated/QUALCOMM India Private Limited.
Dvar Permissions 4 : Not to be used, copied, reproduced in whole or in part, nor its contents revealed in any manner to others without the express written permission of Qualcomm Flarion Technologies, Inc.
Dvar Rights 0 : Qualcomm reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed for any damages arising directly or indirectly by their use or application.
Dvar TM0 : QUALCOMM is a registered trademark of QUALCOMM Incorporated in the United States and may be registered in other countries.
Dvar TM1 : Other product and brand names may be trademarks or registered trademarks of their respective owners.
Dvar TM2 : CDMA2000 is a registered certification mark of the Telecommunications Industry Association, used under license.
Dvar TM3 : ARM is a registered trademark of ARM Limited.
Dvar TM4 : QDSP is a registered trademark of QUALCOMM Incorporated in the United States and other countries.
Dvar TM7 : Portions of this document may have been copied from various Microsoft publications and included herein with permission.
Dvar TM Trig 7 : Windows Mobile; Windows CE
Dvar Export 0 : This technical data may be subject to U.S. and international export, re-export, or transfer ("export") laws. Diversion contrary to U.S. and international law is strictly prohibited.
Dvar Export Footer 0 : MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION
Dvar Address 0 : QUALCOMM Incorporated..5775 Morehouse Drive..San Diego, CA 92121-1714..U.S.A.
Dvar Address 1 : QUALCOMM India Private Limited..Building 10, Mindspace..HiTech City, Madhapur..Hyderabad, Andhra Pradesh 500081..India
Dvar Address 2 : QUALCOMM Israel..Omega Center..MATAM Post Office..Haifa 31905..Israel
Dvar Address 3 : QUALCOMM (UK) Ltd ..Spectrum Point..279 Farnborough Road..Farnborough , Hants..GU14 7LS..UNITED KINGDOM
Dvar Address 4 : QUALCOMM Flarion Technologies, Inc...500 Somerset Corporate Boulevard..Bridgewater, NJ 08807..U.S.A.
Dvar Copyright 0 : Copyright © 2012 QUALCOMM Incorporated...All rights reserved.
Dvar Copyright 1 : Copyright © 2012 QUALCOMM Incorporated/QUALCOMM Israel Ltd...All rights reserved.
Dvar Copyright 2 : Copyright © 2012 QUALCOMM (UK) Limited...All rights reserved.
Dvar Copyright 3 : Copyright © 2012 QUALCOMM Flarion Technologies, Inc. ..All rights reserved.
Dvar Doc Owner : 4
Dvar Distribution : 0
Dvar Restricted 0 : Restricted Distribution.
Dvar Restricted 1 : Not to be distributed to anyone who is not an employee of either Qualcomm or a subsidiary of Qualcomm without the express approval of Qualcomm's Configuration Management.
Dvar Controlled 0 : Controlled Distribution.
Dvar Controlled 1 : To be reproduced, distributed or redistributed only by Qualcomm’s Configuration Management.
Dvar Controlled 4 : Controlled Distribution - DO NOT COPY
Dvar Rights 1 : The information provided in this document is provided on an "as is" basis.
Dvar Discard 0 : This document contains Qualcomm confidential and proprietary information and must be shredded with discarded.
Dvar Legends Date : 6/28/2012
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Dvar Proprietary 2 : Confidential and Proprietary - Qualcomm Atheros, Inc.
Dvar Permissions 5 : Not to be used, copied, reproduced in whole or in part, nor its contents revealed in any manner to others without the express written permission of Qualcomm Atheros, Inc.
Dvar TM8 : QUALCOMM is a registered trademark of QUALCOMM Incorporated. ATHEROS is a registered trademark of Qualcomm Atheros, Inc.
Dvar TM9 : All other registered and unregistered trademarks are the property of QUALCOMM Incorporated, Qualcomm Atheros, Inc., or their respective owners and used with permission.
Dvar TM10 : Registered marks owned by QUALCOMM Incorporated and Qualcomm Atheros, Inc., are registered in the United States of America and may be registered in other countries.
Dvar Address 5 : Qualcomm Atheros, Inc...1700 Technology Drive..San Jose, CA 95110-1383..U.S.A.
Dvar Copyright 4 : Copyright © 2012 Qualcomm Atheros, Inc...All rights reserved.
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Author : QCA
Subject : 80-Y0513-3 Rev. F
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