mmc: mediatek: correct the implementation of msdc_card_busy

msdc_card_busy only need check if the data0 is low.
In sdio data1 irq mode, data1 may be low because of interruption.

Signed-off-by: Yong Mao <yong.mao@mediatek.com>
Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index d33828e..8e32580 100644 (file)
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -1075,11 +1075,8 @@ static int msdc_card_busy(struct mmc_host *mmc)
        struct msdc_host *host = mmc_priv(mmc);
        u32 status = readl(host->base + MSDC_PS);
 
-       /* check if any pin between dat[0:3] is low */
-       if (((status >> 16) & 0xf) != 0xf)
-               return 1;
-
-       return 0;
+       /* only check if data0 is low */
+       return !(status & BIT(16));
 }
 
 static void msdc_request_timeout(struct work_struct *work)