linux-kernel - Re: [PATCH] mmc: sdhci-pci-gli: Disable slow mode in HS400 mode for GL9763E

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Date:   Wed, 25 Nov 2020 18:43:06 +0800
From:   Ben Chuang <benchuanggli@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        greg.tu@...esyslogic.com.tw
Subject: Re: [PATCH] mmc: sdhci-pci-gli: Disable slow mode in HS400 mode for GL9763E

Hi Ulf,

On Wed, Nov 25, 2020 at 6:04 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Wed, 25 Nov 2020 at 10:59, Ben Chuang <benchuanggli@...il.com> wrote:
> >
> > From: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> >
> > The GL9763E uses 150Mhz (slow mode) by default in HS400 mode. In order
> > to make HS400 mode run at 200Mhz, the slow mode needs to be turned off.
> >
> > Fixes: 1ae1d2d6e555 ("mmc: sdhci-pci-gli: Add Genesys Logic GL9763E support")
>
> Why a fixes tag? This patch looks like an improvement and not a fix, right?
>

Since the specification defines that the HS400 mode must run at 200Mhz,
this patch fixes the HS400 mode to 200Mhz.

Best regards,
Ben

> Kind regards
> Uffe
>
> > Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> > ---
> >  drivers/mmc/host/sdhci-pci-gli.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> > index 9887485a4134..d45d7e529150 100644
> > --- a/drivers/mmc/host/sdhci-pci-gli.c
> > +++ b/drivers/mmc/host/sdhci-pci-gli.c
> > @@ -87,6 +87,9 @@
> >  #define PCIE_GLI_9763E_SCR      0x8E0
> >  #define   GLI_9763E_SCR_AXI_REQ           BIT(9)
> >
> > +#define PCIE_GLI_9763E_MMC_CTRL  0x960
> > +#define   GLI_9763E_HS400_SLOW     BIT(3)
> > +
> >  #define SDHCI_GLI_9763E_CQE_BASE_ADDR   0x200
> >  #define GLI_9763E_CQE_TRNS_MODE           (SDHCI_TRNS_MULTI | \
> >                                     SDHCI_TRNS_BLK_CNT_EN | \
> > @@ -764,6 +767,10 @@ static void gli_set_gl9763e(struct sdhci_pci_slot *slot)
> >         value |= GLI_9763E_SCR_AXI_REQ;
> >         pci_write_config_dword(pdev, PCIE_GLI_9763E_SCR, value);
> >
> > +       pci_read_config_dword(pdev, PCIE_GLI_9763E_MMC_CTRL, &value);
> > +       value &= ~GLI_9763E_HS400_SLOW;
> > +       pci_write_config_dword(pdev, PCIE_GLI_9763E_MMC_CTRL, value);
> > +
> >         pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
> >         value &= ~GLI_9763E_VHS_REV;
> >         value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_R);
> > --
> > 2.29.2
> >