linux-kernel - Re: [PATCH 1/4] mmc: sdhci-omap: Fix DCRC error handling during tuning

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Message-ID: <CAPDyKFo==Up-pTGZcjMvKWY70-m7i44A5Yr_qJjtpBFjWK8J5g@mail.gmail.com>
Date:   Mon, 19 Nov 2018 14:18:39 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Faiz Abbas <faiz_abbas@...com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Kishon <kishon@...com>, Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 1/4] mmc: sdhci-omap: Fix DCRC error handling during tuning

On 19 November 2018 at 12:16, Faiz Abbas <faiz_abbas@...com> wrote:
> Commit 7d33c3581536 ("mmc: sdhci-omap: Workaround for Errata i802")
> disabled DCRC interrupts during tuning. This write to the interrupt
> enable register gets overwritten in sdhci_prepare_data() and the
> interrupt is not in fact disabled. Fix this by disabling the interrupt
> in the host->ier variable.
>
> Signed-off-by: Faiz Abbas <faiz_abbas@...com>

Should we have fixes/stable tag?

Kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci-omap.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
> index 88347ce78f23..87138067e334 100644
> --- a/drivers/mmc/host/sdhci-omap.c
> +++ b/drivers/mmc/host/sdhci-omap.c
> @@ -290,7 +290,6 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
>         u32 start_window = 0, max_window = 0;
>         u8 cur_match, prev_match = 0;
>         u32 length = 0, max_len = 0;
> -       u32 ier = host->ier;
>         u32 phase_delay = 0;
>         int ret = 0;
>         u32 reg;
> @@ -317,9 +316,7 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
>          * during the tuning procedure. So disable it during the
>          * tuning procedure.
>          */
> -       ier &= ~SDHCI_INT_DATA_CRC;
> -       sdhci_writel(host, ier, SDHCI_INT_ENABLE);
> -       sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
> +       host->ier &= ~SDHCI_INT_DATA_CRC;
>
>         while (phase_delay <= MAX_PHASE_DELAY) {
>                 sdhci_omap_set_dll(omap_host, phase_delay);
> @@ -366,6 +363,8 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
>
>  ret:
>         sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
> +       /* Reenable forbidden interrupt */
> +       host->ier |= SDHCI_INT_DATA_CRC;
>         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
>         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
>         return ret;
> --
> 2.19.1
>