Re: [PATCH v3 2/3] mmc: sdhci-of-arasan: Add DTS property to disable DCMDs.

Christoph Müllner
2019-03-25T13:39:42Z

> On 25.03.2019, at 14:27, Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> On Fri, 22 Mar 2019 at 12:39, Christoph Muellner
> <christoph.muellner@theobroma-systems.com> wrote:
>>
>> Direct commands (DCMDs) are an optional feature of eMMC 5.1's command
>> queue engine (CQE). The Arasan eMMC 5.1 controller uses the CQHCI,
>> which exposes a control register bit to enable the feature.
>> The current implementation sets this bit unconditionally.
>>
>> This patch allows to suppress the feature activation,
>> by specifying the property disable-cqe-dcmd.
>>
>> Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
>> Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
>> Acked-by: Adrian Hunter <adrian.hunter@intel.com>
>
> Applied for next, thanks!
>
> Perhaps both patch1 and patch2 should be tagged for stable? Then
> please tell me and I can add a tag.

Hi Ulf,

yes tagging for stable would be nice.
I guess, the following would fit:

Fixes: 84362d79f436 ("mmc: sdhci-of-arasan: Add CQHCI support for arasan,sdhci-5.1")

Thanks,
Christoph

>
> Kind regards
> Uffe
>
>
>
>> ---
>> drivers/mmc/host/sdhci-of-arasan.c | 5 ++++-
>> 1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
>> index c9e3e050ccc8..88dc3f00a5be 100644
>> --- a/drivers/mmc/host/sdhci-of-arasan.c
>> +++ b/drivers/mmc/host/sdhci-of-arasan.c
>> @@ -832,7 +832,10 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>> host->mmc_host_ops.start_signal_voltage_switch =
>> sdhci_arasan_voltage_switch;
>> sdhci_arasan->has_cqe = true;
>> - host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
>> + host->mmc->caps2 |= MMC_CAP2_CQE;
>> +
>> + if (!of_property_read_bool(np, "disable-cqe-dcmd"))
>> + host->mmc->caps2 |= MMC_CAP2_CQE_DCMD;
>> }
>>
>> ret = sdhci_arasan_add_host(sdhci_arasan);
>> --
>> 2.11.0
>>