It's also valid as SDHCI at Samsung SoCs.
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
On Sun, Jan 2, 2011 at 9:37 AM, Olof Johansson <olof@xxxxxxxxx> wrote:
> Some controllers misparse segment length 0 as being 0, not 65536. Add
> a quirk to deal with it.
>
> Change-Id: I1422c9c605095addc133e844c66fc49f187dc17d
> Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci.c | 10 +++++++---
> include/linux/mmc/sdhci.h | 2 ++
> 2 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index a25db426..c0094c1 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1928,10 +1928,14 @@ int sdhci_add_host(struct sdhci_host *host)
> * of bytes. When doing hardware scatter/gather, each entry cannot
> * be larger than 64 KiB though.
> */
> - if (host->flags & SDHCI_USE_ADMA)
> - mmc->max_seg_size = 65536;
> - else
> + if (host->flags & SDHCI_USE_ADMA) {
> + if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
> + mmc->max_seg_size = 65535;
> + else
> + mmc->max_seg_size = 65536;
> + } else {
> mmc->max_seg_size = mmc->max_req_size;
> + }
>
> /*
> * Maximum block size. This varies from controller to controller and
> diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
> index 1fdc673..dfb2106 100644
> --- a/include/linux/mmc/sdhci.h
> +++ b/include/linux/mmc/sdhci.h
> @@ -83,6 +83,8 @@ struct sdhci_host {
> #define SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 (1<<28)
> /* Controller doesn't have HISPD bit field in HI-SPEED SD card */
> #define SDHCI_QUIRK_NO_HISPD_BIT (1<<29)
> +/* Controller treats ADMA descriptors with length 0000h incorrectly */
> +#define SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC (1<<30)
>
> int irq; /* Device IRQ */
> void __iomem *ioaddr; /* Mapped address */
> --
> 1.7.3.GIT
>
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