[PATCH 1/2] mmc: mmc_of_parse: Enable 52 MHz support with "cap-mmc-highspeed"

[Patrick DELAUNAY]

Hi,

> From: Alexandru Gagniuc <mr.nuke.me at 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 at 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 at st.com>
Tested-by: Patrick Delaunay <patrick.delaunay at 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.nuke.me@gmail.com/


Thanks

Patrick