On 16/08/18 10:54, Chunyan Zhang wrote:
> For version 4.10 and aboves, SDHCI_ARGUMENT2 is also uses to indicate
> 32-bit number of blocks, it doesn't support stuff bits in argument of
> CMD23, but only block count for the following command (CMD18/25).
>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@xxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci.c | 9 +++++++++
> drivers/mmc/host/sdhci.h | 1 +
> 2 files changed, 10 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index b3328ee..a72ad0d 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1729,6 +1729,15 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
> }
> }
>
> + /*
> + * For version 4.10 and above, ARGUMENT2 register is also used as 32-bit
> + * block count register which don't support stuff bits of CMD23 argument
> + */
> + if (host->version >= SDHCI_SPEC_410 &&
> + mrq->sbc && (mrq->sbc->arg & SDHCI_ARG2_STUFF) &&
> + (host->flags & SDHCI_AUTO_CMD23))
> + host->flags &= ~SDHCI_AUTO_CMD23;
I would prefer this be done in sdhci-sprd.c by hooking ->request(). Someone
sent a patch recently to export sdhci_request().
> +
> if (!present || host->flags & SDHCI_DEVICE_DEAD) {
> mrq->cmd->error = -ENOMEDIUM;
> sdhci_finish_mrq(host, mrq);
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index d34971ac..daf8c1e 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -28,6 +28,7 @@
>
> #define SDHCI_DMA_ADDRESS 0x00
> #define SDHCI_ARGUMENT2 SDHCI_DMA_ADDRESS
> +#define SDHCI_ARG2_STUFF GENMASK(31, 16)
> #define SDHCI_32BIT_BLK_CNT SDHCI_DMA_ADDRESS
>
> #define SDHCI_BLOCK_SIZE 0x04
>
