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mmc: core: Allow hosts to specify non-support for MMC commands

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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>
This commit is contained in:
Shawn Lin 2016-07-01 15:45:28 +08:00 committed by Ulf Hansson
parent 39f80bcb0e
commit a0c3b68c72
2 changed files with 4 additions and 2 deletions
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5
drivers/mmc/core/core.c
View File

@ -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;

1
include/linux/mmc/host.h
View File

@ -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 */