rtw88: use read_poll_timeout instead of fixed sleep

In current wow flow, driver calls rtw_wow_fw_start and sleep for 100ms,
to wait firmware finish preliminary work and then update the value of
WOWLAN_WAKE_REASON register to zero. But later firmware will start wow
function with power-saving mode, in which mode the value of
WOWLAN_WAKE_REASON register is 0xea. So driver may get 0xea value and
return fail. We use read_poll_timeout instead to check the value to avoid
this issue.

Signed-off-by: Chin-Yen Lee <timlee@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210728014335.8785-2-pkshih@realtek.com

diff --git a/drivers/net/wireless/realtek/rtw88/wow.c b/drivers/net/wireless/realtek/rtw88/wow.c
index fc9544f..bdccfa7 100644 (file)
--- a/drivers/net/wireless/realtek/rtw88/wow.c
+++ b/drivers/net/wireless/realtek/rtw88/wow.c
@@ -283,15 +283,26 @@ static void rtw_wow_rx_dma_start(struct rtw_dev *rtwdev)
 
 static int rtw_wow_check_fw_status(struct rtw_dev *rtwdev, bool wow_enable)
 {
-       /* wait 100ms for wow firmware to finish work */
-       msleep(100);
+       int ret;
+       u8 check;
+       u32 check_dis;
 
        if (wow_enable) {
-               if (rtw_read8(rtwdev, REG_WOWLAN_WAKE_REASON))
+               ret = read_poll_timeout(rtw_read8, check, !check, 1000,
+                                       100000, true, rtwdev,
+                                       REG_WOWLAN_WAKE_REASON);
+               if (ret)
                        goto wow_fail;
        } else {
-               if (rtw_read32_mask(rtwdev, REG_FE1IMR, BIT_FS_RXDONE) ||
-                   rtw_read32_mask(rtwdev, REG_RXPKT_NUM, BIT_RW_RELEASE))
+               ret = read_poll_timeout(rtw_read32_mask, check_dis,
+                                       !check_dis, 1000, 100000, true, rtwdev,
+                                       REG_FE1IMR, BIT_FS_RXDONE);
+               if (ret)
+                       goto wow_fail;
+               ret = read_poll_timeout(rtw_read32_mask, check_dis,
+                                       !check_dis, 1000, 100000, false, rtwdev,
+                                       REG_RXPKT_NUM, BIT_RW_RELEASE);
+               if (ret)
                        goto wow_fail;
        }