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.shi@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);