UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Rajkumar Manoharan 2012-06-11 12:19:32 +05:30 committed by John W. Linville
parent 9dd9b0dc1d
commit 3863495b86
3 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/net/wireless/ath/ath9k/ar9003_mci.c
View File

@ -893,6 +893,9 @@ void ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g,
udelay(100);
}
/* Check pending GPM msg before MCI Reset Rx */
ar9003_mci_state(ah, MCI_STATE_CHECK_GPM_OFFSET, NULL);
regval |= SM(1, AR_MCI_COMMAND2_RESET_RX);
REG_WRITE(ah, AR_MCI_COMMAND2, regval);
udelay(1);
@ -1190,6 +1193,21 @@ u32 ar9003_mci_state(struct ath_hw *ah, u32 state_type, u32 *p_data)
value = MS(REG_READ(ah, AR_MCI_GPM_1), AR_MCI_GPM_WRITE_PTR);
mci->gpm_idx = value;
break;
case MCI_STATE_CHECK_GPM_OFFSET:
/*
* This should only be called before "MAC Warm Reset" or
* "MCI Reset Rx".
*/
value = MS(REG_READ(ah, AR_MCI_GPM_1), AR_MCI_GPM_WRITE_PTR);
if (mci->gpm_idx == value)
break;
ath_dbg(common, MCI,
"GPM cached write pointer mismatch %d %d\n",
mci->gpm_idx, value);
mci->query_bt = true;
mci->need_flush_btinfo = true;
mci->gpm_idx = 0;
break;
case MCI_STATE_NEXT_GPM_OFFSET:
case MCI_STATE_LAST_GPM_OFFSET:
/*

1
drivers/net/wireless/ath/ath9k/ar9003_mci.h
View File

@ -190,6 +190,7 @@ enum mci_bt_state {
enum mci_state_type {
MCI_STATE_ENABLE,
MCI_STATE_INIT_GPM_OFFSET,
MCI_STATE_CHECK_GPM_OFFSET,
MCI_STATE_NEXT_GPM_OFFSET,
MCI_STATE_LAST_GPM_OFFSET,
MCI_STATE_BT,

3
drivers/net/wireless/ath/ath9k/hw.c
View File

@ -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);