linux-kernel - Re: [PATCH V2] mmc: sdhci-pci-gli: GL975[05]: Mask the replay timer timeout of AER

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Message-ID: <CAPDyKFob14Tc4c0UxRfj2qbXJkDn7NRwNwRuYQ6m9t3c27Kp=Q@mail.gmail.com>
Date:   Fri, 3 Nov 2023 11:28:22 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Victor Shih <victorshihgli@...il.com>
Cc:     adrian.hunter@...el.com, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, benchuanggli@...il.com,
        HL.Liu@...esyslogic.com.tw, Greg.tu@...esyslogic.com.tw,
        SeanHY.Chen@...esyslogic.com.tw, kai.heng.feng@...onical.com,
        Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: Re: [PATCH V2] mmc: sdhci-pci-gli: GL975[05]: Mask the replay timer
 timeout of AER

On Fri, 3 Nov 2023 at 11:13, Victor Shih <victorshihgli@...il.com> wrote:
>
> Hi, Ulf
>
> Please help review this patch and give me some advice.
> I look forward to your reply.
>
> Thanks, Victor Shih

I don't have in-depth knowledge of how to properly solve this for pci,
so I am relying on Kai and others to help review.

>
> On Wed, Oct 18, 2023 at 6:33 PM Victor Shih <victorshihgli@...il.com> wrote:
> >
> > From: Victor Shih <victor.shih@...esyslogic.com.tw>
> >
> > Due to a flaw in the hardware design, the GL975x replay timer frequently
> > times out when ASPM is enabled. As a result, the warning messages that will
> > often appear in the system log when the system accesses the GL975x
> > PCI config. Therefore, the replay timer timeout must be masked.
> >
> > Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>

The code looks good to me, but let's allow Kai to get some time to
come back to this before I apply it.

Kind regards
Uffe

> > ---
> >
> > Updates in V2:
> >  - Modify the commit message.
> >
> > ---
> >
> >  drivers/mmc/host/sdhci-pci-gli.c | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> > index d83261e857a5..d8a991b349a8 100644
> > --- a/drivers/mmc/host/sdhci-pci-gli.c
> > +++ b/drivers/mmc/host/sdhci-pci-gli.c
> > @@ -28,6 +28,9 @@
> >  #define PCI_GLI_9750_PM_CTRL   0xFC
> >  #define   PCI_GLI_9750_PM_STATE          GENMASK(1, 0)
> >
> > +#define PCI_GLI_9750_CORRERR_MASK                              0x214
> > +#define   PCI_GLI_9750_CORRERR_MASK_REPLAY_TIMER_TIMEOUT         BIT(12)
> > +
> >  #define SDHCI_GLI_9750_CFG2          0x848
> >  #define   SDHCI_GLI_9750_CFG2_L1DLY    GENMASK(28, 24)
> >  #define   GLI_9750_CFG2_L1DLY_VALUE    0x1F
> > @@ -152,6 +155,9 @@
> >  #define PCI_GLI_9755_PM_CTRL     0xFC
> >  #define   PCI_GLI_9755_PM_STATE    GENMASK(1, 0)
> >
> > +#define PCI_GLI_9755_CORRERR_MASK                              0x214
> > +#define   PCI_GLI_9755_CORRERR_MASK_REPLAY_TIMER_TIMEOUT         BIT(12)
> > +
> >  #define SDHCI_GLI_9767_GM_BURST_SIZE                   0x510
> >  #define   SDHCI_GLI_9767_GM_BURST_SIZE_AXI_ALWAYS_SET    BIT(8)
> >
> > @@ -561,6 +567,11 @@ static void gl9750_hw_setting(struct sdhci_host *host)
> >         value &= ~PCI_GLI_9750_PM_STATE;
> >         pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
> >
> > +       /* mask the replay timer timeout of AER */
> > +       pci_read_config_dword(pdev, PCI_GLI_9750_CORRERR_MASK, &value);
> > +       value |= PCI_GLI_9750_CORRERR_MASK_REPLAY_TIMER_TIMEOUT;
> > +       pci_write_config_dword(pdev, PCI_GLI_9750_CORRERR_MASK, value);
> > +
> >         gl9750_wt_off(host);
> >  }
> >
> > @@ -770,6 +781,11 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
> >         value &= ~PCI_GLI_9755_PM_STATE;
> >         pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
> >
> > +       /* mask the replay timer timeout of AER */
> > +       pci_read_config_dword(pdev, PCI_GLI_9755_CORRERR_MASK, &value);
> > +       value |= PCI_GLI_9755_CORRERR_MASK_REPLAY_TIMER_TIMEOUT;
> > +       pci_write_config_dword(pdev, PCI_GLI_9755_CORRERR_MASK, value);
> > +
> >         gl9755_wt_off(pdev);
> >  }
> >
> > --
> > 2.25.1
> >