mmc: core: add mmc_card_can_cmd23

Add a dedicated helper to check for CMD23 support for MMC card, similar
to mmc_host_can_cmd23 for the host, as it is easy to get the check
wrong.

Signed-off-by: Benoît Monin <benoit.monin@bootlin.com>
Link: https://lore.kernel.org/r/20250818-mobileye-emmc-for-upstream-4-v4-1-34ecb3995e96@bootlin.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 874c6fe92855e3535ec0ebc0254146f4b96bccc3..88fd231fee1d150b22baebddb7ad47472c24fb32 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1875,6 +1875,15 @@ bool mmc_card_can_secure_erase_trim(struct mmc_card *card)
 }
 EXPORT_SYMBOL(mmc_card_can_secure_erase_trim);
 
+bool mmc_card_can_cmd23(struct mmc_card *card)
+{
+       return ((mmc_card_mmc(card) &&
+                card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
+               (mmc_card_sd(card) && !mmc_card_ult_capacity(card) &&
+                card->scr.cmds & SD_SCR_CMD23_SUPPORT));
+}
+EXPORT_SYMBOL(mmc_card_can_cmd23);
+
 int mmc_erase_group_aligned(struct mmc_card *card, sector_t from,
                            unsigned int nr)
 {

diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 622085cd766f91334d5b9362cd7b96245af8884d..73f5d3d8c77d5da53795fe09beb384f134d6a886 100644 (file)
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -123,6 +123,7 @@ bool mmc_card_can_trim(struct mmc_card *card);
 bool mmc_card_can_discard(struct mmc_card *card);
 bool mmc_card_can_sanitize(struct mmc_card *card);
 bool mmc_card_can_secure_erase_trim(struct mmc_card *card);
+bool mmc_card_can_cmd23(struct mmc_card *card);
 int mmc_erase_group_aligned(struct mmc_card *card, sector_t from, unsigned int nr);
 unsigned int mmc_calc_max_discard(struct mmc_card *card);