From a0c3b68c72a355f5dab33c3ddcd257e5a718de0c Mon Sep 17 00:00:00 2001 From: Shawn Lin Date: Fri, 1 Jul 2016 15:45:28 +0800 Subject: 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 Signed-off-by: Ulf Hansson 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 */ -- cgit v0.10.2