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

Ulf Hansson
2019-03-25T13:27:59Z

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.

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
>