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    Subject[PATCH v6 3/4] drm/mediatek: add the mipitx driving control
    Date
    Add a property in device tree to control the driving by different
    board.

    Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
    Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
    Signed-off-by: Jitao Shi <jitao.shi@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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