diff options
| author | Shawn Lin <shawn.lin@rock-chips.com> | 2016-07-01 15:45:28 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-07-25 10:34:47 +0200 |
| commit | a0c3b68c72a355f5dab33c3ddcd257e5a718de0c (patch) | |
| tree | 4a571c7a8f641773e4eb18110c1d821c8aa4d476 | |
| parent | 39f80bcb0eed20e08090f8b6ed10a0709f1ae36d (diff) | |
| download | linux-a0c3b68c72a355f5dab33c3ddcd257e5a718de0c.tar.bz2 | |
mmc: core: Allow hosts to specify non-support for MMC commands
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@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | drivers/mmc/core/core.c | 5 | ||||
| -rw-r--r-- | 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 4c823df8deb4..94cbf4e170e3 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 c22476d23b84..aa4bfbf129e4 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 */ |