[PATCH 1/3] drm/mediatek: dpi dual edge sample mode support

[Jitao Shi]

DPI can sample on falling, rising or both edge.
When DPI sample the data both rising and falling edge.
It can reduce half data io pins.

Signed-off-by: Jitao Shi <jitao....@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c 
b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 52f11a63a330..ccd681a2a4c2 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -81,6 +81,7 @@ struct mtk_dpi {
        struct pinctrl *pinctrl;
        struct pinctrl_state *pins_gpio;
        struct pinctrl_state *pins_dpi;
+       bool ddr_edge_sel;
        int refcount;
 };
 
@@ -119,6 +120,7 @@ struct mtk_dpi_conf {
        unsigned int (*cal_factor)(int clock);
        u32 reg_h_fre_con;
        bool edge_sel_en;
+       bool dual_edge;
 };
 
 static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
@@ -378,6 +380,15 @@ static void mtk_dpi_config_color_format(struct mtk_dpi 
*dpi,
        }
 }
 
+static void mtk_dpi_dual_edge(struct mtk_dpi *dpi)
+{
+       if (dpi->conf->dual_edge) {
+               mtk_dpi_mask(dpi, DPI_DDR_SETTING, DDR_EN | DDR_4PHASE,
+                            DDR_EN | DDR_4PHASE);
+               mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, dpi->ddr_edge_sel ? 
EDGE_SEL : 0, EDGE_SEL);
+       }
+}
+
 static void mtk_dpi_power_off(struct mtk_dpi *dpi)
 {
        if (WARN_ON(dpi->refcount == 0))
@@ -516,6 +527,7 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
        mtk_dpi_config_yc_map(dpi, dpi->yc_map);
        mtk_dpi_config_color_format(dpi, dpi->color_format);
        mtk_dpi_config_2n_h_fre(dpi);
+       mtk_dpi_dual_edge(dpi);
        mtk_dpi_config_disable_edge(dpi);
        mtk_dpi_sw_reset(dpi, false);
 
-- 
2.12.5