linux-kernel - Re: [PATCH V1 2/4] mmc: sdhci-msm: Enable MMC_CAP_NEED_RSP

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Date:   Thu, 16 Apr 2020 14:16:24 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Andy Gross <agross@...nel.org>
Subject: Re: [PATCH V1 2/4] mmc: sdhci-msm: Enable MMC_CAP_NEED_RSP_BUSY host capability

On Sun, 12 Apr 2020 at 17:54, Veerabhadrarao Badiganti
<vbadigan@...eaurora.org> wrote:
>
> sdhci-msm controller requires the R1B response for commands that
> has this response associated with them.
>
> So enable MMC_CAP_NEED_RSP_BUSY capability.

I assume this potentially should be considered as fix and tagged for stable?

Another question, if there is there an upper limit of the busy timeout
in the HW (cmd->busy_timeout) or does the driver use a software
timeout that is adjustable?

Kind regards
Uffe

>
> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
> ---
>  drivers/mmc/host/sdhci-msm.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 013dcea..d826e9b 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -2088,6 +2088,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>         }
>
>         msm_host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
> +       msm_host->mmc->caps |= MMC_CAP_NEED_RSP_BUSY;
>
>         pm_runtime_get_noresume(&pdev->dev);
>         pm_runtime_set_active(&pdev->dev);
> --
> Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project