mmc: sd: report correct speed and capacity of uhs cards

Since only UHS-I cards respond with S18A set in response to ACMD41,
we set the card as ultra-high-speed after successfull initialization.
We need to decide whether a card is SDXC based on the C_SIZE field
of CSDv2.0 register. According to Physical Layer spec v3.01, the
minimum value of C_SIZE for SDXC card is 00FFFFh.

Tested by Zhangfei Gao with a Toshiba uhs card and general hs card,
on mmp2 in SDMA mode.

Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Reviewed-by: Philip Rakity <prakity@marvell.com>
Tested-by: Philip Rakity <prakity@marvell.com>
Acked-by: Zhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 8e2d8012e4cb..732c3171ceca 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -130,7 +130,7 @@ static int mmc_decode_csd(struct mmc_card *card)
                 break;
         case 1:
                 /*
-                 * This is a block-addressed SDHC card. Most
+                 * This is a block-addressed SDHC or SDXC card. Most
                  * interesting fields are unused and have fixed
                  * values. To avoid getting tripped by buggy cards,
                  * we assume those fixed values ourselves.
@@ -144,6 +144,11 @@ static int mmc_decode_csd(struct mmc_card *card)
                 e = UNSTUFF_BITS(resp, 96, 3);
                 csd->max_dtr      = tran_exp[e] * tran_mant[m];
                 csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
+                csd->c_size       = UNSTUFF_BITS(resp, 48, 22);
+
+                /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
+                if (csd->c_size >= 0xFFFF)
+                        mmc_card_set_ext_capacity(card);
 
                 m = UNSTUFF_BITS(resp, 48, 22);
                 csd->capacity     = (1 + m) << 10;
@@ -911,6 +916,9 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
                 err = mmc_sd_init_uhs_card(card);
                 if (err)
                         goto free_card;
+
+                /* Card is an ultra-high-speed card */
+                mmc_sd_card_set_uhs(card);
         } else {
                 /*
                  * Attempt to change to high-speed (if supported)