[v4 3/5] drm/mediatek: add mt8183 dpi dual edge support

Jitao Shi
2019-05-18T09:56:16Z

Add mt8183 dual edge support.
DPI sample the data both rising and falling edge.
It can reduce half data io pins.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
---
drivers/gpu/drm/mediatek/mtk_dpi.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index ccef3ac1c560..77e6e0f99188 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -682,6 +682,16 @@ static unsigned int mt2701_calculate_factor(int clock)
return 2;
}

+static unsigned int mt8183_calculate_factor(int clock)
+{
+ if (clock <= 27000)
+ return 8;
+ else if (clock <= 167000)
+ return 4;
+ else
+ return 2;
+}
+
static const struct mtk_dpi_conf mt8173_conf = {
.cal_factor = mt8173_calculate_factor,
.reg_h_fre_con = 0xe0,
@@ -693,6 +703,12 @@ static const struct mtk_dpi_conf mt2701_conf = {
.edge_sel_en = true,
};

+static const struct mtk_dpi_conf mt8183_conf = {
+ .cal_factor = mt8183_calculate_factor,
+ .reg_h_fre_con = 0xe0,
+ .dual_edge = true,
+};
+
static int mtk_dpi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -788,6 +804,9 @@ static const struct of_device_id mtk_dpi_of_ids[] = {
{ .compatible = "mediatek,mt8173-dpi",
.data = &mt8173_conf,
},
+ { .compatible = "mediatek,mt8183-dpi",
+ .data = &mt8183_conf,
+ },
{ },
};

--
2.21.0