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mwifiex: add support for sleep cookie in PCIe 

This patch adds support to read sleep cookie for command
response before accessing buffer.

Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Avinash Patil 2014-03-18 22:19:17 -07:00 committed by John W. Linville
parent cc5c1afb1e
commit c4bc980f1b
2 changed files with 28 additions and 0 deletions
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26
drivers/net/wireless/mwifiex/pcie.c
View File

@ -327,6 +327,30 @@ static void mwifiex_pcie_dev_wakeup_delay(struct mwifiex_adapter *adapter)
return;
}
static void mwifiex_delay_for_sleep_cookie(struct mwifiex_adapter *adapter,
u32 max_delay_loop_cnt)
{
struct pcie_service_card *card = adapter->card;
u8 *buffer;
u32 sleep_cookie, count;
for (count = 0; count < max_delay_loop_cnt; count++) {
buffer = card->cmdrsp_buf->data - INTF_HEADER_LEN;
sleep_cookie = *(u32 *)buffer;
if (sleep_cookie == MWIFIEX_DEF_SLEEP_COOKIE) {
dev_dbg(adapter->dev,
"sleep cookie found at count %d\n", count);
break;
}
usleep_range(20, 30);
}
if (count >= max_delay_loop_cnt)
dev_dbg(adapter->dev,
"max count reached while accessing sleep cookie\n");
}
/* This function wakes up the card by reading fw_status register. */
static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter)
{
@ -1539,6 +1563,8 @@ static int mwifiex_pcie_process_cmd_complete(struct mwifiex_adapter *adapter)
"Write register failed\n");
return -1;
}
mwifiex_delay_for_sleep_cookie(adapter,
MWIFIEX_MAX_DELAY_COUNT);
while (reg->sleep_cookie && (count++ < 10) &&
mwifiex_pcie_ok_to_access_hw(adapter))
usleep_range(50, 60);

2
drivers/net/wireless/mwifiex/pcie.h
View File

@ -97,6 +97,8 @@
#define MWIFIEX_PCIE_BLOCK_SIZE_FW_DNLD 256
/* FW awake cookie after FW ready */
#define FW_AWAKE_COOKIE (0xAA55AA55)
#define MWIFIEX_DEF_SLEEP_COOKIE 0xBEEFBEEF
#define MWIFIEX_MAX_DELAY_COUNT 5
struct mwifiex_pcie_card_reg {
u16 cmd_addr_lo;