On 15/11/16 12:13, Michael Walle wrote:
> Since commit 87a18a6a5652 ("mmc: mmc: Use ->card_busy() to detect busy
> cards in __mmc_switch()") the ESDHC driver is broken:
> mmc0: Card stuck in programming state! __mmc_switch
> mmc0: error -110 whilst initialising MMC card
>
> Since this commit __mmc_switch() uses ->card_busy(), which is
> sdhci_card_busy() for the esdhc driver. sdhci_card_busy() uses the
> PRESENT_STATE register, specifically the DAT0 signal level bit. But the
> ESDHC uses a non-conformant PRESENT_STATE register, thus a read fixup is
> required to make the driver work again.
>
> Signed-off-by: Michael Walle <michael@xxxxxxxx>
> Fixes: 87a18a6a5652 ("mmc: mmc: Use ->card_busy() to detect busy cards in __mmc_switch()")
> Acked-by: Yangbo Lu <yangbo.lu@xxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> v4:
> - add and use SDHCI_CMD_LVL macro
> - fix typo in comment, thanks alex
> - add acked-by
>
> v3:
> - explain the bits in the comments
> - use bits[19:0] from the original value, all other will be taken from the
> fixup value.
>
> v2:
> - use lower bits of the original value (that was actually a typo)
> - add fixes tag
> - fix typo
>
> drivers/mmc/host/sdhci-of-esdhc.c | 14 ++++++++++++++
> drivers/mmc/host/sdhci.h | 1 +
> 2 files changed, 15 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
> index fb71c86..1bb11e4 100644
> --- a/drivers/mmc/host/sdhci-of-esdhc.c
> +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> @@ -66,6 +66,20 @@ static u32 esdhc_readl_fixup(struct sdhci_host *host,
> return ret;
> }
> }
> + /*
> + * The DAT[3:0] line signal levels and the CMD line signal level are
> + * not compatible with standard SDHC register. The line signal levels
> + * DAT[7:0] are at bits 31:24 and the command line signal level is at
> + * bit 23. All other bits are the same as in the standard SDHC
> + * register.
> + */
> + if (spec_reg == SDHCI_PRESENT_STATE) {
> + ret = value & 0x000fffff;
> + ret |= (value >> 4) & SDHCI_DATA_LVL_MASK;
> + ret |= (value << 1) & SDHCI_CMD_LVL;
> + return ret;
> + }
> +
> ret = value;
> return ret;
> }
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index c722cd2..ea38962 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -73,6 +73,7 @@
> #define SDHCI_DATA_LVL_MASK 0x00F00000
> #define SDHCI_DATA_LVL_SHIFT 20
> #define SDHCI_DATA_0_LVL_MASK 0x00100000
> +#define SDHCI_CMD_LVL 0x01000000
>
> #define SDHCI_HOST_CONTROL 0x28
> #define SDHCI_CTRL_LED 0x01
>
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