mmc: core: fix the decision of HS200/DDR card-type

Current implementation decides the card type exclusively. Even though
eMMC device can support both HS200 and DDR mode, card type will be
set only for HS200. If the host doesn't support HS200 but has DDR
capability, then DDR mode can't be selected.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 32 insertions, 49 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 54df5adc0413..0477769a8841 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -235,6 +235,36 @@ static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
         return err;
 }
 
+static void mmc_select_card_type(struct mmc_card *card)
+{
+        struct mmc_host *host = card->host;
+        u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
+        unsigned int caps = host->caps, caps2 = host->caps2;
+        unsigned int hs_max_dtr = 0;
+
+        if (card_type & EXT_CSD_CARD_TYPE_26)
+                hs_max_dtr = MMC_HIGH_26_MAX_DTR;
+
+        if (caps & MMC_CAP_MMC_HIGHSPEED &&
+                        card_type & EXT_CSD_CARD_TYPE_52)
+                hs_max_dtr = MMC_HIGH_52_MAX_DTR;
+
+        if ((caps & MMC_CAP_1_8V_DDR &&
+                        card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) ||
+            (caps & MMC_CAP_1_2V_DDR &&
+                        card_type & EXT_CSD_CARD_TYPE_DDR_1_2V))
+                hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
+
+        if ((caps2 & MMC_CAP2_HS200_1_8V_SDR &&
+                        card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) ||
+            (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
+                        card_type & EXT_CSD_CARD_TYPE_SDR_1_2V))
+                hs_max_dtr = MMC_HS200_MAX_DTR;
+
+        card->ext_csd.hs_max_dtr = hs_max_dtr;
+        card->ext_csd.card_type = card_type;
+}
+
 /*
  * Decode extended CSD.
  */
@@ -284,56 +314,9 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
                         mmc_card_set_blockaddr(card);
         }
+
         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
-        switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
-        case EXT_CSD_CARD_TYPE_SDR_ALL:
-        case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_8V:
-        case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_2V:
-        case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_52:
-                card->ext_csd.hs_max_dtr = 200000000;
-                card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_200;
-                break;
-        case EXT_CSD_CARD_TYPE_SDR_1_2V_ALL:
-        case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_8V:
-        case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_2V:
-        case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_52:
-                card->ext_csd.hs_max_dtr = 200000000;
-                card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_2V;
-                break;
-        case EXT_CSD_CARD_TYPE_SDR_1_8V_ALL:
-        case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_8V:
-        case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_2V:
-        case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_52:
-                card->ext_csd.hs_max_dtr = 200000000;
-                card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_8V;
-                break;
-        case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
-             EXT_CSD_CARD_TYPE_26:
-                card->ext_csd.hs_max_dtr = 52000000;
-                card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
-                break;
-        case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
-             EXT_CSD_CARD_TYPE_26:
-                card->ext_csd.hs_max_dtr = 52000000;
-                card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
-                break;
-        case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
-             EXT_CSD_CARD_TYPE_26:
-                card->ext_csd.hs_max_dtr = 52000000;
-                card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
-                break;
-        case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
-                card->ext_csd.hs_max_dtr = 52000000;
-                break;
-        case EXT_CSD_CARD_TYPE_26:
-                card->ext_csd.hs_max_dtr = 26000000;
-                break;
-        default:
-                /* MMC v4 spec says this cannot happen */
-                pr_warning("%s: card is mmc v4 but doesn't "
-                        "support any high-speed modes.\n",
-                        mmc_hostname(card->host));
-        }
+        mmc_select_card_type(card);
 
         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
         card->ext_csd.raw_erase_timeout_mult =