On 21/08/17 10:41, Kishon Vijay Abraham I wrote:
> TI's implementation of sdhci controller used in DRA7 SoC's has
> CRC in responses with length 136 bits. Add quirk to indicate
> the controller has CRC in MMC_RSP_136. If this quirk is
> set sdhci library shouldn't shift the response present in
> SDHCI_RESPONSE register.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci.c | 3 +++
> drivers/mmc/host/sdhci.h | 2 ++
> 2 files changed, 5 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index ba639b7851cb..9c8d7428df3c 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1182,6 +1182,9 @@ static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
> cmd->resp[i] = sdhci_readl(host, reg);
> }
>
> + if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC)
> + return;
> +
> /* CRC is stripped so we need to do some shifting */
> for (i = 0; i < 4; i++) {
> cmd->resp[i] <<= 8;
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 399edc681623..54bc444c317f 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -435,6 +435,8 @@ struct sdhci_host {
> #define SDHCI_QUIRK2_ACMD23_BROKEN (1<<14)
> /* Broken Clock divider zero in controller */
> #define SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN (1<<15)
> +/* Controller has CRC in 136 bit Command Response */
> +#define SDHCI_QUIRK2_RSP_136_HAS_CRC (1<<16)
>
> int irq; /* Device IRQ */
> void __iomem *ioaddr; /* Mapped address */
>
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