On Mon, 2 Nov 2020 at 08:26, Yangbo Lu <yangbo.lu@xxxxxxx> wrote:
>
> There was no way for user to know what UHS-I modes the SD card
> supporting. We might not know, even the highest speed mode
> failed to use and fell back to a lower speed mode.
>
> This patch is to export sd3_bus_mode to user space to check.
Well, even if the user would know, what can it do about it?
Sound like you are looking for some debugging feature instead?
Kind regards
Uffe
>
> Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxx>
> ---
> drivers/mmc/core/sd.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
> index 6f054c4..13409c2 100644
> --- a/drivers/mmc/core/sd.c
> +++ b/drivers/mmc/core/sd.c
> @@ -689,6 +689,7 @@ MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
> MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
> MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
> MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
> +MMC_DEV_ATTR(sd3_bus_mode, "0x%08x\n", card->sw_caps.sd3_bus_mode);
>
>
> static ssize_t mmc_dsr_show(struct device *dev,
> @@ -753,6 +754,7 @@ static struct attribute *sd_std_attrs[] = {
> &dev_attr_ocr.attr,
> &dev_attr_rca.attr,
> &dev_attr_dsr.attr,
> + &dev_attr_sd3_bus_mode.attr,
> NULL,
> };
>
> --
> 2.7.4
>
