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authorHeiner Kallweit <hkallweit1@gmail.com>2017-02-07 22:35:59 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2017-02-14 09:10:58 +0100
commite21e6fdd2935e147f845de7ddf39d6204a075a46 (patch)
tree7e74a7f27b648d722021740e44ccc0b82abc8cd6 /drivers/mmc
parent62d721a646a9d515bd7b13bede78a1c02890b956 (diff)
downloadop-kernel-dev-e21e6fdd2935e147f845de7ddf39d6204a075a46.zip
op-kernel-dev-e21e6fdd2935e147f845de7ddf39d6204a075a46.tar.gz
mmc: meson-gx: add support for HS400 mode
Add support for HS400 mode. The driver still misses support for tuning, therefore highspeed modes like HS400 might not work under all circumstances yet. Successfully tested on a Odroid C2 (S905 GXBB). Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Reviewed-by: Kevin Hilman <khilman@baylibre.com> Tested-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/meson-gx-mmc.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 3cc6334..5a95978 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -83,6 +83,7 @@
#define CFG_RC_CC_MASK 0xf
#define CFG_STOP_CLOCK BIT(22)
#define CFG_CLK_ALWAYS_ON BIT(18)
+#define CFG_CHK_DS BIT(20)
#define CFG_AUTO_CLK BIT(23)
#define SD_EMMC_STATUS 0x48
@@ -408,6 +409,16 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
val &= ~(CFG_RC_CC_MASK << CFG_RC_CC_SHIFT);
val |= ilog2(SD_EMMC_CFG_CMD_GAP) << CFG_RC_CC_SHIFT;
+ val &= ~CFG_DDR;
+ if (ios->timing == MMC_TIMING_UHS_DDR50 ||
+ ios->timing == MMC_TIMING_MMC_DDR52 ||
+ ios->timing == MMC_TIMING_MMC_HS400)
+ val |= CFG_DDR;
+
+ val &= ~CFG_CHK_DS;
+ if (ios->timing == MMC_TIMING_MMC_HS400)
+ val |= CFG_CHK_DS;
+
writel(val, host->regs + SD_EMMC_CFG);
if (val != orig)
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