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

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Date: Wed, 3 Jan 2024 11:27:16 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Wenchao Chen <wenchao.chen666@...il.com>
Cc: Baolin Wang <baolin.wang@...ux.alibaba.com>, Wenchao Chen <wenchao.chen@...soc.com>, 
	zhang.lyra@...il.com, orsonzhai@...il.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 Wed, 3 Jan 2024 at 02:41, Wenchao Chen <wenchao.chen666@...il.com> wrote:
>
> Gentle ping.

Thanks for pinging and sorry for the delay!

Patch applied for fixes and by adding a stable tag, thanks!

Kind regards
Uffe

>
> Thanks,
> Wenchao.Chen
>
> On Tue, 12 Dec 2023 at 10:57, Baolin Wang <baolin.wang@...ux.alibaba.com> wrote:
> >
> >
> >
> > On 12/8/2023 7:52 PM, Wenchao Chen wrote:
> > > 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")
> >
> > With the Fixes tag, looks goo to me.
> > Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
> >
> > >>> ---
> > >>>   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
> > >>>