Hi,
From: Alexandru Gagniuc mr.nuke.me@gmail.com Sent: mardi 15 septembre 2020 21:52
"cap-mmc-highspeed" enables support for 26 MHz MMC, but there is no additional flag to enable 52 MHz MMC. In Linux. "cap-mmc-highspeed" is used for MMC HS at both 26MHz and 52MHz.
Use the same approach and enable MMC_CAP(MMC_HS_52) host capability when "cap-mmc-highspeed" is found in the devicetree. In the event an MMC card doesn't support 52 MHz, it will be clocked at a speed based on its EXT CSD, even on 52 MHz host controllers
Signed-off-by: Alexandru Gagniuc mr.nuke.me@gmail.com
drivers/mmc/mmc-uclass.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c index 90690c8d1e..6d2310eff3 100644 --- a/drivers/mmc/mmc-uclass.c +++ b/drivers/mmc/mmc-uclass.c @@ -198,7 +198,7 @@ int mmc_of_parse(struct udevice *dev, struct mmc_config *cfg) if (dev_read_bool(dev, "cap-sd-highspeed")) cfg->host_caps |= MMC_CAP(SD_HS); if (dev_read_bool(dev, "cap-mmc-highspeed"))
cfg->host_caps |= MMC_CAP(MMC_HS);
cfg->host_caps |= MMC_CAP(MMC_HS) |MMC_CAP(MMC_HS_52); if (dev_read_bool(dev, "sd-uhs-sdr12")) cfg->host_caps |= MMC_CAP(UHS_SDR12); if (dev_read_bool(dev, "sd-uhs-sdr25")) -- 2.25.4
Reviewed-by: Patrick Delaunay patrick.delaunay@st.com Tested-by: Patrick Delaunay patrick.delaunay@st.com
Tested on STM32MP157C-EV1, for mmc 1 = emmc with patch [1]
Mode: MMC High Speed (52MHz)
[1]: mmc: stm32_sdmmc2: Use mmc_of_parse() to read host capabilities http://patchwork.ozlabs.org/project/uboot/patch/20200909215402.366561-1-mr.n...
Thanks
Patrick