On 30/08/18 10:04, Chunyan Zhang wrote:
> On 30 August 2018 at 13:59, Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote:
>> 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
>
> I think you mean like this:
>
> if ((host->version >= SDHCI_SPEC_300) &&
> ((host->flags & SDHCI_USE_ADMA) ||
> !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) &&
> !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN))
>
> Otherwise, without checking (host->flags & SDHCI_USE_ADMA), if using
> ADMA and SDMA on v3 mode, auto-CMD23 would not be selected.
Yeah you are right - I was thinking SDHCI_USE_SDMA and SDHCI_USE_ADMA were
mutually exclusive. Thanks!
>
>>
>>>
>>>>> host->flags |= SDHCI_AUTO_CMD23;
>>>>> DBG("Auto-CMD23 available\n");
>>>>>
>>>>
>>>
>>
>
