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authorMasahiro Yamada <yamada.masahiro@socionext.com>2016-12-08 21:50:54 +0900
committerUlf Hansson <ulf.hansson@linaro.org>2016-12-08 15:02:45 +0100
commit85a882c2e91d3655927ecdc1db823d1420a65b8f (patch)
treea8c832b9c8f636a782675cd309129300cef98fe4 /drivers/mmc
parent6b11e70bb72c5bfbd7d1544518d26d4b1100aae1 (diff)
downloadlinux-85a882c2e91d3655927ecdc1db823d1420a65b8f.tar.bz2
mmc: sdhci: export sdhci_execute_tuning()
Some SDHCI-compat controllers support not only SD, but also eMMC, but they use different commands for tuning: CMD19 for SD, CMD21 for eMMC. Due to the difference of the underlying mechanism, some controllers (at least, the Cadence IP is the case) provide their own registers for the eMMC tuning. This commit will be useful when we want to override .execute_tuning callback (for eMMC HS200 tuning), but still let it fall back to sdhci_execute_tuning() for SD timing. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci.c3
-rw-r--r--drivers/mmc/host/sdhci.h1
2 files changed, 3 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 2b89fb9e9a6b..111991e5b9a0 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2100,7 +2100,7 @@ static void __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode,
sdhci_reset_tuning(host);
}
-static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
+int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host = mmc_priv(mmc);
int err = 0;
@@ -2168,6 +2168,7 @@ out_unlock:
return err;
}
+EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
static int sdhci_select_drive_strength(struct mmc_card *card,
unsigned int max_dtr, int host_drv,
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 2fe9e8053359..0b66f210ae82 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -690,6 +690,7 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
void sdhci_set_bus_width(struct sdhci_host *host, int width);
void sdhci_reset(struct sdhci_host *host, u8 mask);
void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
+int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
#ifdef CONFIG_PM
extern int sdhci_suspend_host(struct sdhci_host *host);