mmc: sdhci: fix incorrect command used in tuning

commit 473b095a72a95ba719905b1f2e82cd18d099a427 upstream.

For SD hosts using retuning mode 1, when retuning timer expired, it will
need to do retuning in sdhci_request before processing the actual
request. But the retuning command is fixed: cmd19 for SD card and cmd21
for eMMC card, so we can't use the original request's command to do the
tuning.

And since the tuning command depends on the card type attached to the
host, we will need to know the card type to use the correct tuning
command.

Signed-off-by: Aaron Lu <aaron.lu@amd.com>
Reviewed-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index f4b8b4db3a9acd8ccc1c3fdf32c18efc2a8bc88d..1dffebe5c4737187acb572005694e64dc68c6be9 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -27,6 +27,7 @@
 
 #include <linux/mmc/mmc.h>
 #include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
 
 #include "sdhci.h"
 
@@ -1245,6 +1246,7 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
        struct sdhci_host *host;
        bool present;
        unsigned long flags;
+       u32 tuning_opcode;
 
        host = mmc_priv(mmc);
 
@@ -1292,8 +1294,12 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
                 */
                if ((host->flags & SDHCI_NEEDS_RETUNING) &&
                    !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) {
+                       /* eMMC uses cmd21 while sd and sdio use cmd19 */
+                       tuning_opcode = mmc->card->type == MMC_TYPE_MMC ?
+                               MMC_SEND_TUNING_BLOCK_HS200 :
+                               MMC_SEND_TUNING_BLOCK;
                        spin_unlock_irqrestore(&host->lock, flags);
-                       sdhci_execute_tuning(mmc, mrq->cmd->opcode);
+                       sdhci_execute_tuning(mmc, tuning_opcode);
                        spin_lock_irqsave(&host->lock, flags);
 
                        /* Restore original mmc_request structure */