linux-kernel - Re: [PATCH] mmc: sdhci-pci-gli: Finetune HS400 RX delay for GL9763E

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Date:   Tue, 19 Jan 2021 14:42:55 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Renius Chen <reniuschengl@...il.com>
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: Finetune HS400 RX delay for GL9763E

On Mon, 11 Jan 2021 at 09:22, Renius Chen <reniuschengl@...il.com> wrote:
>
> To improve the compatibility of GL9763E with HS400 eMMC cards,
> finetune the RX delay of HS400 mode.
>
> Signed-off-by: Renius Chen <reniuschengl@...il.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/sdhci-pci-gli.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> index 2d13bfcbcacf..14d9154f3af1 100644
> --- a/drivers/mmc/host/sdhci-pci-gli.c
> +++ b/drivers/mmc/host/sdhci-pci-gli.c
> @@ -95,6 +95,10 @@
>  #define PCIE_GLI_9763E_MMC_CTRL  0x960
>  #define   GLI_9763E_HS400_SLOW     BIT(3)
>
> +#define PCIE_GLI_9763E_CLKRXDLY  0x934
> +#define   GLI_9763E_HS400_RXDLY    GENMASK(31, 28)
> +#define   GLI_9763E_HS400_RXDLY_5  0x5
> +
>  #define SDHCI_GLI_9763E_CQE_BASE_ADDR   0x200
>  #define GLI_9763E_CQE_TRNS_MODE           (SDHCI_TRNS_MULTI | \
>                                     SDHCI_TRNS_BLK_CNT_EN | \
> @@ -801,6 +805,11 @@ static void gli_set_gl9763e(struct sdhci_pci_slot *slot)
>         value |= FIELD_PREP(GLI_9763E_CFG2_L1DLY, GLI_9763E_CFG2_L1DLY_MAX);
>         pci_write_config_dword(pdev, PCIE_GLI_9763E_CFG2, value);
>
> +       pci_read_config_dword(pdev, PCIE_GLI_9763E_CLKRXDLY, &value);
> +       value &= ~GLI_9763E_HS400_RXDLY;
> +       value |= FIELD_PREP(GLI_9763E_HS400_RXDLY, GLI_9763E_HS400_RXDLY_5);
> +       pci_write_config_dword(pdev, PCIE_GLI_9763E_CLKRXDLY, 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);
> --
> 2.27.0
>