mmc: sdio: Add high speed support to sdio_reset_comm()

Signed-off-by: San Mehat <san@google.com>

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 0b976f0..9de1f54 100644 (file)
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -968,7 +968,28 @@ int sdio_reset_comm(struct mmc_card *card)
                        goto err;
        }
 
-       mmc_set_clock(host, card->cis.max_dtr);
+       /*
+        * Switch to high-speed (if supported).
+        */
+       err = sdio_enable_hs(card);
+       if (err)
+               goto err;
+
+       /*
+        * Change to the card's maximum speed.
+        */
+       if (mmc_card_highspeed(card)) {
+               /*
+                * The SDIO specification doesn't mention how
+                * the CIS transfer speed register relates to
+                * high-speed, but it seems that 50 MHz is
+                * mandatory.
+                */
+               mmc_set_clock(host, 50000000);
+       } else {
+               mmc_set_clock(host, card->cis.max_dtr);
+       }
+
        err = sdio_enable_wide(card);
        if (err)
                goto err;