linux-kernel - Re: [PATCH] mmc: sdhci-pci-gli: Enlarge ASPM L1 entry delay of GL975x

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Date:   Thu, 15 Apr 2021 14:02:33 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Ben Chuang <benchuanggli@...il.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        SeanHY.Chen@...esyslogic.com.tw,
        ReniusChen[陳建宏] 
        <Renius.Chen@...esyslogic.com.tw>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        GregTu[杜啟軒] <greg.tu@...esyslogic.com.tw>
Subject: Re: [PATCH] mmc: sdhci-pci-gli: Enlarge ASPM L1 entry delay of GL975x

On Thu, 15 Apr 2021 at 05:23, Ben Chuang <benchuanggli@...il.com> wrote:
>
> GL975x enters ASPM L1 state after a short idle in default.
> Enlarge the idle period to 7.9us for improving the R/W performance.
>
> Signed-off-by: Ben Chuang <benchuanggli@...il.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/sdhci-pci-gli.c | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> index eb1ebb67e113..592d79082f58 100644
> --- a/drivers/mmc/host/sdhci-pci-gli.c
> +++ b/drivers/mmc/host/sdhci-pci-gli.c
> @@ -22,6 +22,10 @@
>  #define   GLI_9750_WT_EN_ON        0x1
>  #define   GLI_9750_WT_EN_OFF       0x0
>
> +#define SDHCI_GLI_9750_CFG2          0x848
> +#define   SDHCI_GLI_9750_CFG2_L1DLY    GENMASK(28, 24)
> +#define   GLI_9750_CFG2_L1DLY_VALUE    0x1F
> +
>  #define SDHCI_GLI_9750_DRIVING      0x860
>  #define   SDHCI_GLI_9750_DRIVING_1    GENMASK(11, 0)
>  #define   SDHCI_GLI_9750_DRIVING_2    GENMASK(27, 26)
> @@ -113,6 +117,10 @@
>  #define   PCI_GLI_9755_LFCLK    GENMASK(14, 12)
>  #define   PCI_GLI_9755_DMACLK   BIT(29)
>
> +#define PCI_GLI_9755_CFG2          0x48
> +#define   PCI_GLI_9755_CFG2_L1DLY    GENMASK(28, 24)
> +#define   GLI_9755_CFG2_L1DLY_VALUE  0x1F
> +
>  #define PCI_GLI_9755_PLL            0x64
>  #define   PCI_GLI_9755_PLL_LDIV       GENMASK(9, 0)
>  #define   PCI_GLI_9755_PLL_PDIV       GENMASK(14, 12)
> @@ -408,6 +416,22 @@ static void sdhci_gl9750_set_clock(struct sdhci_host *host, unsigned int clock)
>         sdhci_enable_clk(host, clk);
>  }
>
> +static void gl9750_hw_setting(struct sdhci_host *host)
> +{
> +       u32 value;
> +
> +       gl9750_wt_on(host);
> +
> +       value = sdhci_readl(host, SDHCI_GLI_9750_CFG2);
> +       value &= ~SDHCI_GLI_9750_CFG2_L1DLY;
> +       /* set ASPM L1 entry delay to 7.9us */
> +       value |= FIELD_PREP(SDHCI_GLI_9750_CFG2_L1DLY,
> +                           GLI_9750_CFG2_L1DLY_VALUE);
> +       sdhci_writel(host, value, SDHCI_GLI_9750_CFG2);
> +
> +       gl9750_wt_off(host);
> +}
> +
>  static void gli_pcie_enable_msi(struct sdhci_pci_slot *slot)
>  {
>         int ret;
> @@ -555,6 +579,13 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
>         value &= ~PCI_GLI_9755_SCP_DIS;
>         pci_write_config_dword(pdev, PCI_GLI_9755_SerDes, value);
>
> +       pci_read_config_dword(pdev, PCI_GLI_9755_CFG2, &value);
> +       value &= ~PCI_GLI_9755_CFG2_L1DLY;
> +       /* set ASPM L1 entry delay to 7.9us */
> +       value |= FIELD_PREP(PCI_GLI_9755_CFG2_L1DLY,
> +                           GLI_9755_CFG2_L1DLY_VALUE);
> +       pci_write_config_dword(pdev, PCI_GLI_9755_CFG2, value);
> +
>         gl9755_wt_off(pdev);
>  }
>
> @@ -562,6 +593,7 @@ static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
>  {
>         struct sdhci_host *host = slot->host;
>
> +       gl9750_hw_setting(host);
>         gli_pcie_enable_msi(slot);
>         slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
>         sdhci_enable_v4_mode(host);
> --
> 2.30.0
>