[PATCH v4 3/4] drm/mediatek: add the mipitx driving control

[Chun-Kuang Hu]

Hi, Jitao:

Jitao Shi <jitao.shi at mediatek.com> 於 2020年3月31日 週二 下午4:28寫道：
>
> Add a property in device tree to control the driving by different
> board.

Reviewed-by: Chun-Kuang Hu <chunkuang.hu at kernel.org>

>
> Reviewed-by: Matthias Brugger <matthias.bgg at gmail.com>
> Signed-off-by: Jitao Shi <jitao.shi at mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_mipi_tx.c        | 14 ++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_mipi_tx.h        |  1 +
>  drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c |  7 +++++++
>  3 files changed, 22 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
> index e4d34484ecc8..e301af64809e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
> @@ -125,6 +125,20 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev)
>                 return ret;
>         }
>
> +       ret = of_property_read_u32(dev->of_node, "drive-strength-microamp",
> +                                  &mipi_tx->mipitx_drive);
> +       /* If can't get the "mipi_tx->mipitx_drive", set it default 0x8 */
> +       if (ret < 0)
> +               mipi_tx->mipitx_drive = 4600;
> +
> +       /* check the mipitx_drive valid */
> +       if (mipi_tx->mipitx_drive > 6000 || mipi_tx->mipitx_drive < 3000) {
> +               dev_warn(dev, "drive-strength-microamp is invalid %d, not in 3000 ~ 6000\n",
> +                        mipi_tx->mipitx_drive);
> +               mipi_tx->mipitx_drive = clamp_val(mipi_tx->mipitx_drive, 3000,
> +                                                 6000);
> +       }
> +
>         ref_clk_name = __clk_get_name(ref_clk);
>
>         ret = of_property_read_string(dev->of_node, "clock-output-names",
> diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.h b/drivers/gpu/drm/mediatek/mtk_mipi_tx.h
> index 413f35d86219..eea44327fe9f 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mipi_tx.h
> +++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.h
> @@ -27,6 +27,7 @@ struct mtk_mipi_tx {
>         struct device *dev;
>         void __iomem *regs;
>         u32 data_rate;
> +       u32 mipitx_drive;
>         const struct mtk_mipitx_data *driver_data;
>         struct clk_hw pll_hw;
>         struct clk *pll;
> diff --git a/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c
> index 91f08a351fd0..e4cc967750cb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c
> @@ -17,6 +17,9 @@
>  #define RG_DSI_BG_CORE_EN              BIT(7)
>  #define RG_DSI_PAD_TIEL_SEL            BIT(8)
>
> +#define MIPITX_VOLTAGE_SEL     0x0010
> +#define RG_DSI_HSTX_LDO_REF_SEL                (0xf << 6)
> +
>  #define MIPITX_PLL_PWR         0x0028
>  #define MIPITX_PLL_CON0                0x002c
>  #define MIPITX_PLL_CON1                0x0030
> @@ -123,6 +126,10 @@ static void mtk_mipi_tx_power_on_signal(struct phy *phy)
>         mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_D3_SW_CTL_EN, DSI_SW_CTL_EN);
>         mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_CK_SW_CTL_EN, DSI_SW_CTL_EN);
>
> +       mtk_mipi_tx_update_bits(mipi_tx, MIPITX_VOLTAGE_SEL,
> +                               RG_DSI_HSTX_LDO_REF_SEL,
> +                               (mipi_tx->mipitx_drive - 3000) / 200 << 6);
> +
>         mtk_mipi_tx_set_bits(mipi_tx, MIPITX_CK_CKMODE_EN, DSI_CK_CKMODE_EN);
>  }
>
> --
> 2.21.0
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