On 29 August 2018 at 18:59, Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote:
> On 29/08/18 10:03, 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>
>> ---
>> drivers/mmc/host/sdhci.c | 8 ++++++--
>> 1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index 62d843ac90..ac92e0f 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -3834,10 +3834,14 @@ 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->v4_mode && !(host->flags & SDHCI_USE_SDMA)) ||
>> + (host->v4_mode && (host->flags & SDHCI_USE_SDMA))) &&
>> !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
>
> This is over complicated. We can use auto-CMD23 if not using SDMA or if in
> v4_mode i.e.
>
> if (host->version >= SDHCI_SPEC_300 &&
> (!(host->flags & SDHCI_USE_SDMA) || host->v4_mode) &&
> !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
>
So no matter whether SDHCI_USE_ADMA is selected, right?
>> host->flags |= SDHCI_AUTO_CMD23;
>> DBG("Auto-CMD23 available\n");
>>
>
