hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Heiner Kallweit 2017-02-07 22:35:59 +01:00 committed by Ulf Hansson
parent 62d721a646
commit e21e6fdd29
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/mmc/host/meson-gx-mmc.c
View File

@ -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)