On 30/08/18 11:21, Chunyan Zhang wrote:
> When Host Version 4 Enable is set to 1, SDMA uses ADMA System Address
> register (05Fh-058h) instead of using register (000h-004h) to indicate
> its system address of data location. The register (000h-004h) is
> re-assigned to 32-bit Block Count and Auto CMD23 argument, so then SDMA
> may use Auto CMD23.
>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@xxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 62d843ac90..606d331 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -3834,10 +3834,13 @@ int sdhci_setup_host(struct sdhci_host *host)
> if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
> host->flags |= SDHCI_AUTO_CMD12;
>
> - /* Auto-CMD23 stuff only works in ADMA or PIO. */
> + /*
> + * For v3 mode, Auto-CMD23 stuff only works in ADMA or PIO.
> + * For v4 mode, SDMA may use Auto-CMD23 as well.
> + */
> if ((host->version >= SDHCI_SPEC_300) &&
> ((host->flags & SDHCI_USE_ADMA) ||
> - !(host->flags & SDHCI_USE_SDMA)) &&
> + !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) &&
> !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
> host->flags |= SDHCI_AUTO_CMD23;
> DBG("Auto-CMD23 available\n");
>
