mmc: fix response timeout after switch command

After issuing the switch command: Wait until 'current state' of the card
status becomes 'tran'. This prevents from response timeout at the next
command because of 'current state' = 'data'.

Signed-off-by: Stefan Bosch <stefan_b@posteo.net>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index d67af80..b4c8e7f 100644 (file)
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -841,7 +841,8 @@ static int __mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value,
                                 value);
                        return -EIO;
                }
-               if (!ret && (status & MMC_STATUS_RDY_FOR_DATA))
+               if (!ret && (status & MMC_STATUS_RDY_FOR_DATA) &&
+                   (status & MMC_STATUS_CURR_STATE) == MMC_STATE_TRANS)
                        return 0;
                udelay(100);
        } while (get_timer(start) < timeout_ms);

diff --git a/include/mmc.h b/include/mmc.h
index c12c7a0..effccaa 100644 (file)
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -178,6 +178,7 @@ static inline bool mmc_is_tuning_cmd(uint cmdidx)
 #define MMC_STATUS_ERROR       (1 << 19)
 
 #define MMC_STATE_PRG          (7 << 9)
+#define MMC_STATE_TRANS                (4 << 9)
 
 #define MMC_VDD_165_195                0x00000080      /* VDD voltage 1.65 - 1.95 */
 #define MMC_VDD_20_21          0x00000100      /* VDD voltage 2.0 ~ 2.1 */