mmc: meson-gx: add support for HS400 mode
Subsystems (2)
PATCH 1/1 mmc: meson-gx: add support for HS400 mode
Add support for HS400 mode.
Successfully tested on a Odroid C2 (S905 GXBB).
--- drivers/mmc/host/meson-gx-mmc.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
drivers/mmc/host/meson-gx-mmc.c +11 -0
@@ -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
@@ -412,6 +413,16 @@ 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)
Signature · 1 line
2.11.0
Kevin Hilman
maintainerPATCH 1/1 mmc: meson-gx: add support for HS400 mode
Quoted 5 lines · Heiner Kallweit
Add support for HS400 mode.
Successfully tested on a Odroid C2 (S905 GXBB).
Signed-off-by Heiner Kallweit <[email protected]>
Excellent! Thanks for the patch.
Some folks on IRC had reported that eMMC wasn't working on some boards (like Amlogic P200) and with this patch, it's working again for me on P200.
@Andreas: does this patch fix your R-box Pro?
Kevin
Quoted 33 lines
--- drivers/mmc/host/meson-gx-mmc.c | 11 +++++++++++ 1 file changed, 11 insertions(+)drivers/mmc/host/meson-gx-mmc.c +11
-0@@ -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@@ -412,6 +413,16 @@ 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)
PATCH 1/1 mmc: meson-gx: add support for HS400 mode
Quoted 13 lines · Kevin Hilman
Quoted 5 lines · Heiner Kallweit
Add support for HS400 mode.
Successfully tested on a Odroid C2 (S905 GXBB).
Signed-off-by Heiner Kallweit <[email protected]>Excellent! Thanks for the patch.
Reviewed-by Kevin Hilman <[email protected]>Tested-by Kevin Hilman <[email protected]>
Quoted 6 lines
Some folks on IRC had reported that eMMC wasn't working on some boards (like Amlogic P200) and with this patch, it's working again for me on P200.
@Andreas: does this patch fix your R-box Pro?
Kevin
Hi Heiner,
Actually activating HS400 and DDR modes should need DT attributes to actually enable them in the MMC core code, and it seems the hardware needs some timings adjustment to use these modes. If you consider they are enabled by U-boot, good but it won't always be the case !
Ulf, what is exactly needed to support these modes ?
In other drivers and Amlogic own driver, they have support for the some calibration commands handling.
Neil
Quoted 34 lines
Quoted 34 lines
--- drivers/mmc/host/meson-gx-mmc.c | 11 +++++++++++ 1 file changed, 11 insertions(+)drivers/mmc/host/meson-gx-mmc.c +11
-0@@ -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@@ -412,6 +413,16 @@ 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)
PATCH 1/1 mmc: meson-gx: add support for HS400 mode
Am 06.02.2017 um 10:32 schrieb Neil Armstrong:
Quoted 19 lines · Kevin Hilman
Quoted 18 lines
Quoted 5 lines · Heiner Kallweit
Add support for HS400 mode.
Successfully tested on a Odroid C2 (S905 GXBB).
Signed-off-by Heiner Kallweit <[email protected]>Excellent! Thanks for the patch.
Reviewed-by Kevin Hilman <[email protected]>Tested-by Kevin Hilman <[email protected]>Some folks on IRC had reported that eMMC wasn't working on some boards (like Amlogic P200) and with this patch, it's working again for me on P200.
@Andreas: does this patch fix your R-box Pro?
Quoted 8 lines
Quoted 1 line
Kevin
Hi Heiner,
Actually activating HS400 and DDR modes should need DT attributes to actually enable them in the MMC core code, and it seems the hardware needs some timings adjustment to use these modes. If you consider they are enabled by U-boot, good but it won't always be the case !
Sure, to enable HS400 the related DT property needs to be set. I did this for my tests. HS400 worked out of the box with 200MHz and a Hardkernel 8GB eMMC card. However with a Hardkernel 128GB card I have issues with 200MHz even in SDR mode. So yes, it seems at least tuning support needs to be added to the driver.
By the way: With the current mainline driver I have terrible performance, reads in the range 10-15 MB/s. Even the uboot driver is faster, at least it states that it reads the kernel image with 40 MB/s.
Quoted 4 lines
Ulf, what is exactly needed to support these modes ?
In other drivers and Amlogic own driver, they have support for the some calibration commands handling.
Chip-internal calibration support sounds nice, however I have only the Amlogic driver as basis and the pure register description in the Hardkernel-provided S905GXBB spec. The spec misses more detailed information on how the calibration support works and how the registers are supposed to be used.
Quoted 38 lines
Neil
Quoted 34 lines
Quoted 34 lines
--- drivers/mmc/host/meson-gx-mmc.c | 11 +++++++++++ 1 file changed, 11 insertions(+)drivers/mmc/host/meson-gx-mmc.c +11
-0@@ -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@@ -412,6 +413,16 @@ 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)