linux-kernel - Re: [PATCH] mmc: sprd: Fix eMMC init failure after hw reset

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Date:   Thu, 7 Dec 2023 14:58:56 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Wenchao Chen <wenchao.chen@...soc.com>
Cc:     zhang.lyra@...il.com, orsonzhai@...il.com,
        baolin.wang@...ux.alibaba.com, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, wenchao.chen666@...il.com,
        zhenxiong.lai@...soc.com, yuelin.tang@...soc.com
Subject: Re: [PATCH] mmc: sprd: Fix eMMC init failure after hw reset

On Mon, 4 Dec 2023 at 07:50, Wenchao Chen <wenchao.chen@...soc.com> wrote:
>
> Some eMMC devices that do not close the auto clk gate
> after hw reset will cause eMMC initialization to fail.
>
> Signed-off-by: Wenchao Chen <wenchao.chen@...soc.com>

I assume we want this tagged for stable kernels too, but do we have a
corresponding fixes commit that we can point out?

Kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci-sprd.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index 6b8a57e2d20f..bed57a1c64b5 100644
> --- a/drivers/mmc/host/sdhci-sprd.c
> +++ b/drivers/mmc/host/sdhci-sprd.c
> @@ -239,15 +239,19 @@ static inline void _sdhci_sprd_set_clock(struct sdhci_host *host,
>         div = ((div & 0x300) >> 2) | ((div & 0xFF) << 8);
>         sdhci_enable_clk(host, div);
>
> +       val = sdhci_readl(host, SDHCI_SPRD_REG_32_BUSY_POSI);
> +       mask = SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN | SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN;
>         /* Enable CLK_AUTO when the clock is greater than 400K. */
>         if (clk > 400000) {
> -               val = sdhci_readl(host, SDHCI_SPRD_REG_32_BUSY_POSI);
> -               mask = SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN |
> -                       SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN;
>                 if (mask != (val & mask)) {
>                         val |= mask;
>                         sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
>                 }
> +       } else {
> +               if (val & mask) {
> +                       val &= ~mask;
> +                       sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
> +               }
>         }
>  }
>
> --
> 2.17.1
>