Re: [PATCH v3 1/4] mmc: dw_mmc: exynos: incorporate ciu_div into timing property

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On 31 December 2014 at 07:43, Alim Akhtar <alim.akhtar@xxxxxxxxxxx> wrote:
> From: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
>
> ciu_div may not be common value for all speed mode.
> So, it needs to be attached to CLKSEL timing.
> This also introduce a new compatibale 'dw-mshc-hs200-timing'
> for selecting hs200 timing value

According to the patch you are adding a new DT property not a
"compatible". Please update the commit message.

The rest looks good to me.

Kind regards
Uffe

>
> Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
> Signed-off-by: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
> ---
>  .../devicetree/bindings/mmc/exynos-dw-mshc.txt     |   15 ++--
>  drivers/mmc/host/dw_mmc-exynos.c                   |   81 ++++++++++++++------
>  drivers/mmc/host/dw_mmc-exynos.h                   |    1 +
>  3 files changed, 67 insertions(+), 30 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
> index ee4fc05..06455de 100644
> --- a/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
> +++ b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
> @@ -23,10 +23,6 @@ Required Properties:
>         - "samsung,exynos7-dw-mshc-smu": for controllers with Samsung Exynos7
>           specific extensions having an SMU.
>
> -* samsung,dw-mshc-ciu-div: Specifies the divider value for the card interface
> -  unit (ciu) clock. This property is applicable only for Exynos5 SoC's and
> -  ignored for Exynos4 SoC's. The valid range of divider value is 0 to 7.
> -
>  * samsung,dw-mshc-sdr-timing: Specifies the value of CIU clock phase shift value
>    in transmit mode and CIU clock phase shift value in receive mode for single
>    data rate mode operation. Refer notes below for the order of the cells and the
> @@ -37,11 +33,16 @@ Required Properties:
>    data rate mode operation. Refer notes below for the order of the cells and the
>    valid values.
>
> +* samsung,dw-mshc-hs200-timing: Similar with dw-mshc-sdr-timing.
> +
>    Notes for the sdr-timing and ddr-timing values:
>
>      The order of the cells should be
>        - First Cell: CIU clock phase shift value for tx mode.
>        - Second Cell: CIU clock phase shift value for rx mode.
> +      - Thrid Cell: Specifies the divider value for the card interface
> +        unit (ciu) clock. This property is applicable only for Exynos5 SoC's and
> +        ignored for Exynos4 SoC's. The valid range of divider value is 0 to 7.
>
>      Valid values for SDR and DDR CIU clock timing for Exynos5250:
>        - valid value for tx phase shift and rx phase shift is 0 to 7.
> @@ -79,8 +80,8 @@ Example:
>                 broken-cd;
>                 fifo-depth = <0x80>;
>                 card-detect-delay = <200>;
> -               samsung,dw-mshc-ciu-div = <3>;
> -               samsung,dw-mshc-sdr-timing = <2 3>;
> -               samsung,dw-mshc-ddr-timing = <1 2>;
> +               samsung,dw-mshc-sdr-timing = <2 3 3>;
> +               samsung,dw-mshc-ddr-timing = <1 2 3>;
> +               samsung,dw-mshc-hs200-timing = <0 2 3>;
>                 bus-width = <8>;
>         };
> diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
> index 12a5eaa..be6530e 100644
> --- a/drivers/mmc/host/dw_mmc-exynos.c
> +++ b/drivers/mmc/host/dw_mmc-exynos.c
> @@ -40,6 +40,7 @@ struct dw_mci_exynos_priv_data {
>         u8                              ciu_div;
>         u32                             sdr_timing;
>         u32                             ddr_timing;
> +       u32                             hs200_timing;
>         u32                             cur_speed;
>  };
>
> @@ -71,6 +72,21 @@ static struct dw_mci_exynos_compatible {
>         },
>  };
>
> +static inline u8 dw_mci_exynos_get_ciu_div(struct dw_mci *host)
> +{
> +       struct dw_mci_exynos_priv_data *priv = host->priv;
> +
> +       if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412)
> +               return EXYNOS4412_FIXED_CIU_CLK_DIV;
> +       else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210)
> +               return EXYNOS4210_FIXED_CIU_CLK_DIV;
> +       else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
> +                       priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
> +               return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL64)) + 1;
> +       else
> +               return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL)) + 1;
> +}
> +
>  static int dw_mci_exynos_priv_init(struct dw_mci *host)
>  {
>         struct dw_mci_exynos_priv_data *priv = host->priv;
> @@ -85,6 +101,8 @@ static int dw_mci_exynos_priv_init(struct dw_mci *host)
>                            SDMMC_MPSCTRL_NON_SECURE_WRITE_BIT);
>         }
>
> +       priv->ciu_div = dw_mci_exynos_get_ciu_div(host);
> +
>         return 0;
>  }
>
> @@ -92,7 +110,7 @@ static int dw_mci_exynos_setup_clock(struct dw_mci *host)
>  {
>         struct dw_mci_exynos_priv_data *priv = host->priv;
>
> -       host->bus_hz /= (priv->ciu_div + 1);
> +       host->bus_hz /= priv->ciu_div;
>
>         return 0;
>  }
> @@ -177,9 +195,14 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
>         struct dw_mci_exynos_priv_data *priv = host->priv;
>         unsigned int wanted = ios->clock;
>         unsigned long actual;
> -       u8 div = priv->ciu_div + 1;
>
> -       if (ios->timing == MMC_TIMING_MMC_DDR52) {
> +       if (ios->timing == MMC_TIMING_MMC_HS200) {
> +               if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
> +                       priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
> +                       mci_writel(host, CLKSEL64, priv->hs200_timing);
> +               else
> +                       mci_writel(host, CLKSEL, priv->hs200_timing);
> +       } else if (ios->timing == MMC_TIMING_MMC_DDR52) {
>                 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
>                         priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
>                         mci_writel(host, CLKSEL64, priv->ddr_timing);
> @@ -208,6 +231,7 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
>                 wanted = EXYNOS_CCLKIN_MIN;
>
>         if (wanted != priv->cur_speed) {
> +               u8 div = dw_mci_exynos_get_ciu_div(host);
>                 int ret = clk_set_rate(host->ciu_clk, wanted * div);
>                 if (ret)
>                         dev_warn(host->dev,
> @@ -220,14 +244,34 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
>         }
>  }
>
> +static int dw_mci_exynos_dt_populate_timing(struct dw_mci *host,
> +                                           unsigned int ctrl_type,
> +                                           const char *propname,
> +                                           u32 *out_values)
> +{
> +       struct device_node *np = host->dev->of_node;
> +       u32 timing[3];
> +       int ret;
> +
> +       ret = of_property_read_u32_array(np, propname, timing, 3);
> +       if (ret)
> +               return ret;
> +
> +       if (ctrl_type == DW_MCI_TYPE_EXYNOS4412 ||
> +           ctrl_type == DW_MCI_TYPE_EXYNOS4210)
> +               timing[2] = 0;
> +
> +       *out_values = SDMMC_CLKSEL_TIMING(timing[0], timing[1], timing[2]);
> +
> +       return 0;
> +}
> +
> +
>  static int dw_mci_exynos_parse_dt(struct dw_mci *host)
>  {
>         struct dw_mci_exynos_priv_data *priv;
>         struct device_node *np = host->dev->of_node;
> -       u32 timing[2];
> -       u32 div = 0;
> -       int idx;
> -       int ret;
> +       int idx, ret;
>
>         priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
>         if (!priv)
> @@ -238,29 +282,20 @@ static int dw_mci_exynos_parse_dt(struct dw_mci *host)
>                         priv->ctrl_type = exynos_compat[idx].ctrl_type;
>         }
>
> -       if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412)
> -               priv->ciu_div = EXYNOS4412_FIXED_CIU_CLK_DIV - 1;
> -       else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210)
> -               priv->ciu_div = EXYNOS4210_FIXED_CIU_CLK_DIV - 1;
> -       else {
> -               of_property_read_u32(np, "samsung,dw-mshc-ciu-div", &div);
> -               priv->ciu_div = div;
> -       }
> -
> -       ret = of_property_read_u32_array(np,
> -                       "samsung,dw-mshc-sdr-timing", timing, 2);
> +       ret = dw_mci_exynos_dt_populate_timing(host, priv->ctrl_type,
> +                       "samsung,dw-mshc-sdr-timing", &priv->sdr_timing);
>         if (ret)
>                 return ret;
>
> -       priv->sdr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
> -
> -       ret = of_property_read_u32_array(np,
> -                       "samsung,dw-mshc-ddr-timing", timing, 2);
> +       ret = dw_mci_exynos_dt_populate_timing(host, priv->ctrl_type,
> +                       "samsung,dw-mshc-ddr-timing", &priv->ddr_timing);
>         if (ret)
>                 return ret;
>
> -       priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
> +       dw_mci_exynos_dt_populate_timing(host, priv->ctrl_type,
> +               "samsung,dw-mshc-hs200-timing", &priv->hs200_timing);
>         host->priv = priv;
> +
>         return 0;
>  }
>
> diff --git a/drivers/mmc/host/dw_mmc-exynos.h b/drivers/mmc/host/dw_mmc-exynos.h
> index 7872ce5..c04ecef 100644
> --- a/drivers/mmc/host/dw_mmc-exynos.h
> +++ b/drivers/mmc/host/dw_mmc-exynos.h
> @@ -21,6 +21,7 @@
>  #define SDMMC_CLKSEL_CCLK_DRIVE(x)     (((x) & 7) << 16)
>  #define SDMMC_CLKSEL_CCLK_DIVIDER(x)   (((x) & 7) << 24)
>  #define SDMMC_CLKSEL_GET_DRV_WD3(x)    (((x) >> 16) & 0x7)
> +#define SDMMC_CLKSEL_GET_DIV(x)                (((x) >> 24) & 0x7)
>  #define SDMMC_CLKSEL_TIMING(x, y, z)   (SDMMC_CLKSEL_CCLK_SAMPLE(x) |  \
>                                          SDMMC_CLKSEL_CCLK_DRIVE(y) |   \
>                                          SDMMC_CLKSEL_CCLK_DIVIDER(z))
> --
> 1.7.9.5
>
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