mmc: core: Block CMD23 support for UHS104/SDXC cards.

SD cards operating at UHS104 or better support SET_BLOCK_COUNT.

Signed-off-by: Andrei Warkentin <andreiw@motorola.com>
Reviewed-by: Arindam Nath <arindam.nath@amd.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index a380accaba9a..71da5641e258 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1057,9 +1057,12 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
         blk_queue_logical_block_size(md->queue.queue, 512);
         set_capacity(md->disk, size);
 
-        if (mmc_host_cmd23(card->host) &&
-            mmc_card_mmc(card))
-                md->flags |= MMC_BLK_CMD23;
+        if (mmc_host_cmd23(card->host)) {
+                if (mmc_card_mmc(card) ||
+                    (mmc_card_sd(card) &&
+                     card->scr.cmds & SD_SCR_CMD23_SUPPORT))
+                        md->flags |= MMC_BLK_CMD23;
+        }
 
         if (mmc_card_mmc(card) &&
             md->flags & MMC_BLK_CMD23 &&