ath9k_hw: check GPM HW write pointer before chip reset

Both "MAC Warm Reset" and "MCI Reset Rx" will reset GPM HW write_ptr.
We should check software cached write_ptr against HW write_ptr before
reset. Otherwise the pending DMA data will be lost.

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 6d893335f42b..8412128b842a 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1348,6 +1348,9 @@ static bool ath9k_hw_set_reset(struct ath_hw *ah, int type)
                 }
         }
 
+        if (ath9k_hw_mci_is_enabled(ah))
+                ar9003_mci_state(ah, MCI_STATE_CHECK_GPM_OFFSET, NULL);
+
         REG_WRITE(ah, AR_RTC_RC, rst_flags);
 
         REGWRITE_BUFFER_FLUSH(ah);