On 29/08/18 14:39, Chunyan Zhang wrote:
> 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?
Yes
>
>>> host->flags |= SDHCI_AUTO_CMD23;
>>> DBG("Auto-CMD23 available\n");
>>>
>>
>
