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

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Date:   Fri, 8 Dec 2023 19:52:12 +0800
From:   Wenchao Chen <wenchao.chen666@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Wenchao Chen <wenchao.chen@...soc.com>, zhang.lyra@...il.com,
        orsonzhai@...il.com, baolin.wang@...ux.alibaba.com,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhenxiong.lai@...soc.com, yuelin.tang@...soc.com
Subject: Re: [PATCH] mmc: sprd: Fix eMMC init failure after hw reset

On Thu, 7 Dec 2023 at 21:59, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> 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
>

Hi Uffe
Sorry, I forgot to add fixes commit.

Fixes: ff874dbc4f86 ("mmc: sdhci-sprd: Disable CLK_AUTO when the clock
is less than 400K")

Thanks

> > ---
> >  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
> >