linux-kernel - Re: [RESEND, PATCH] mmc: sdhci-pci-gli: A workaround to allow GL9755 to enter ASPM L1.2

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Message-ID: <CACT4zj9rRmwPBTg6GE1qd_F_sUuaJeQbB4U3K0h24jWKe8oRWQ@mail.gmail.com>
Date:   Mon, 25 Apr 2022 08:53:22 +0800
From:   Ben Chuang <benchuanggli@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        SeanHY.Chen@...esyslogic.com.tw,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        greg.tu@...esyslogic.com.tw,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>
Subject: Re: [RESEND, PATCH] mmc: sdhci-pci-gli: A workaround to allow GL9755
 to enter ASPM L1.2

On Thu, Apr 21, 2022 at 9:55 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Thu, 14 Apr 2022 at 11:49, Ben Chuang <benchuanggli@...il.com> wrote:
> >
> > From: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> >
> > When GL9755 enters ASPM L1 sub-states, it will stay at L1.1 and will not
> > enter L1.2. The workaround is to toggle PM state to allow GL9755 to enter
> > ASPM L1.2.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
>
> This didn't apply cleanly, I fixed it up this time. So, applied for
> next, thanks!
>
> Kind regards
> Uffe

I forgot to rebase to v5.18rc. I will pay more attention next time. Thank you.

Best regards,
Ben

>
>
> > ---
> >  drivers/mmc/host/sdhci-pci-gli.c | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> > index 97035d77c18c..52230857388f 100644
> > --- a/drivers/mmc/host/sdhci-pci-gli.c
> > +++ b/drivers/mmc/host/sdhci-pci-gli.c
> > @@ -137,6 +137,9 @@
> >  #define PCI_GLI_9755_SerDes  0x70
> >  #define PCI_GLI_9755_SCP_DIS   BIT(19)
> >
> > +#define PCI_GLI_9755_PM_CTRL     0xFC
> > +#define   PCI_GLI_9755_PM_STATE    GENMASK(1, 0)
> > +
> >  #define GLI_MAX_TUNING_LOOP 40
> >
> >  /* Genesys Logic chipset */
> > @@ -597,6 +600,13 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
> >                             GLI_9755_CFG2_L1DLY_VALUE);
> >         pci_write_config_dword(pdev, PCI_GLI_9755_CFG2, value);
> >
> > +       /* toggle PM state to allow GL9755 to enter ASPM L1.2 */
> > +       pci_read_config_dword(pdev, PCI_GLI_9755_PM_CTRL, &value);
> > +       value |= PCI_GLI_9755_PM_STATE;
> > +       pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
> > +       value &= ~PCI_GLI_9755_PM_STATE;
> > +       pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
> > +
> >         gl9755_wt_off(pdev);
> >  }
> >
> > --
> > 2.35.1
> >