ENGR00175692-01 [MX6DL] SD3.0: can not recognize SD3.0 cards on some boards.

Improve compatibility by doing the following:
	- Change DSE to 34ohm for 200MHz
	- Reset host controller before changing clk tuning ctrl reg

Signed-off-by: Ryan QIAN <b32804@freescale.com>

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index b7291e0444f6188dbcdbe60357e1df38027485a1..5d9d7529e130b3f7e971d29bcba2be164d4b7794 100644 (file)
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -637,11 +637,13 @@ static int mmc_sd_init_uhs_card(struct mmc_card *card)
                        min += card->host->tuning_step;
                }
 
-               max = min;
+               max = min + card->host->tuning_step;
                while (max < card->host->tuning_max) {
                        mmc_set_tuning(card->host, max);
-                       if (!mmc_send_tuning_cmd(card))
+                       if (mmc_send_tuning_cmd(card)) {
+                               max -= card->host->tuning_step;
                                break;
+                       }
                        max += card->host->tuning_step;
                }