drm/mediatek: add the mipitx driving control

Add a property in device tree to control the driving by different
board.

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

diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
index e4d3448..e301af6 100644 (file)
--- 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 413f35d..eea4432 100644 (file)
--- 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 91f08a3..e4cc967 100644 (file)
--- 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);
 }