From: Rakesh Pillai <pillair@xxxxxxxxxxxxxx> Enable STA idle mode power save(IMPS) for WCN3990 TLV target. In-order to support STA idle mode ps direct access to CE registers are protected via 2 mechanism. As target can power collapse based on idle inactivity and any target register access during that state can lead to un-clocked access. 2) Caching SRRI/DRRI in DDR. WN3990 has a shadow block in HW which is always on domain and allows HOST/APPS access irrespective of power state of the target(Common subsystem(includes CE block) might be down due to idle/inactivity). Any operation on the shadow registers are directly reflected back in the actual CE registers( SRWI/DRWI) once common subsystem gets up. The shadow registers configuration is supplied via QMI message. WC3990 has 24 shadow registers and mapping of shadow register(0-23) to CE registers(0-12) is as following. ----------------------------------------------------------- Shadow Register | CE | src/dst write index ----------------------------------------------------------- 0 | 0 | src 3 | 3 | src 4 | 4 | src 5 | 5 | src 7 | 7 | src 13 | 1 | dst 14 | 2 | dst 19 | 7 | dst 20 | 8 | dst 21 | 9 | dst 22 | 10 | dst 23 | 11 | dst 1) Caching SRWI/SRWI in HW shadow block. Since shadow block allows only WRITE access, for read access(SRRI/DRRI) driver allocates region in DDR(12CE*half WORD) which is being configured in CE UPD control register. CE SRRI/DRRI are restored and replayed on the configured region(DDR) on each update. HOST/APPS reads SRRI/DRRI from the DDR to make the access independent of target power state. Govind Singh (2): ath10k: Enable SRRI/DRRI support on ddr for WCN3990 ath10k: Enable sta idle power save Rakesh Pillai (2): ath10k: Add hw params for shadow register support ath10k: Add support for shadow register for WNC3990 drivers/net/wireless/ath/ath10k/ce.c | 245 +++++++++++++++++++++++++++++++-- drivers/net/wireless/ath/ath10k/ce.h | 14 ++ drivers/net/wireless/ath/ath10k/core.c | 26 ++++ drivers/net/wireless/ath/ath10k/hw.c | 9 +- drivers/net/wireless/ath/ath10k/hw.h | 17 ++- drivers/net/wireless/ath/ath10k/mac.c | 7 + drivers/net/wireless/ath/ath10k/snoc.c | 3 + 7 files changed, 310 insertions(+), 11 deletions(-) -- 2.14.1