[PATCH] mmc: core: Initial support for SD express card/host

[Arnd Bergmann]

On Thu, Jul 16, 2020 at 4:16 PM Ulf Hansson <ulf.hansson at linaro.org> wrote:

> +       /* Continue with the SD express init, if the card supports it. */
> +       resp &= 0x3000;
> +       if (pcie_bits && resp) {
> +               if (resp == 0x3000)
> +                       host->ios.timing = MMC_TIMING_SD_EXP_1_2V;
> +               else
> +                       host->ios.timing = MMC_TIMING_SD_EXP;
> +
> +               /*
> +                * According to the spec the clock shall also be gated, but
> +                * let's leave this to the host driver for more flexibility.
> +                */
> +               return host->ops->init_sd_express(host, &host->ios);
> +       }
> +
>         return 0;
>  }

Does this need an additional handshake or timeout to see if the
device was successfully probed by the nvme driver?

It looks like the card would just disappear here if e.g. the nvme driver
is not loaded or runs into a runtime error.

     Arnd