Host drivers which needs to valdiate for non-supported MMC
commands and returnn error code for such requests.
To improve and simplify the behaviour, let's invent MMC_CAP2_NO_MMC
which these host drivers can set to tell the mmc core to skip sending MMC
commands during card initialization.
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
---
drivers/mmc/core/core.c | 5 +++--
include/linux/mmc/host.h | 1 +
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 4c823df..94cbf4e 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2510,8 +2510,9 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
if (!mmc_attach_sd(host))
return 0;
- if (!mmc_attach_mmc(host))
- return 0;
+ if (!(host->caps2 & MMC_CAP2_NO_MMC))
+ if (!mmc_attach_mmc(host))
+ return 0;
mmc_power_off(host);
return -EIO;
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c22476d..aa4bfbf 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -310,6 +310,7 @@ struct mmc_host {
#define MMC_CAP2_NO_SDIO (1 << 19) /* Do not send SDIO commands during initialization */
#define MMC_CAP2_HS400_ES (1 << 20) /* Host supports enhanced strobe */
#define MMC_CAP2_NO_SD (1 << 21) /* Do not send SD commands during initialization */
+#define MMC_CAP2_NO_MMC (1 << 22) /* Do not send (e)MMC commands during initialization */
mmc_pm_flag_t pm_caps; /* supported pm features */
--
2.3.7
--
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