[v5,PATCH 1/3] drm/mediatek: dpi dual edge sample mode support
From: Rex-BC Chen <hidden>
Date: 2021-05-26 08:52:35
Also in:
linux-devicetree, linux-mediatek, lkml
Subsystem:
drm drivers, drm drivers for mediatek, the rest · Maintainers:
David Airlie, Simona Vetter, Chun-Kuang Hu, Philipp Zabel, Linus Torvalds
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. Use num_output_fmts to determine whether it is dual edge mode. Signed-off-by: Jitao Shi <redacted> Signed-off-by: Rex-BC Chen <redacted> --- drivers/gpu/drm/mediatek/mtk_dpi.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index bea91c81626e..f034ebd12fa6 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c@@ -83,6 +83,7 @@ struct mtk_dpi { struct pinctrl *pinctrl; struct pinctrl_state *pins_gpio; struct pinctrl_state *pins_dpi; + unsigned int output_fmt; int refcount; };
@@ -381,6 +382,20 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi, } } +static void mtk_dpi_dual_edge(struct mtk_dpi *dpi) +{ + if ((dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_LE) || + (dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_BE)) { + mtk_dpi_mask(dpi, DPI_DDR_SETTING, DDR_EN | DDR_4PHASE, + DDR_EN | DDR_4PHASE); + mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, + dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_LE ? + EDGE_SEL : 0, EDGE_SEL); + } else { + mtk_dpi_mask(dpi, DPI_DDR_SETTING, DDR_EN | DDR_4PHASE, 0); + } +} + static void mtk_dpi_power_off(struct mtk_dpi *dpi) { if (WARN_ON(dpi->refcount == 0))
@@ -455,7 +470,13 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi, pll_rate = clk_get_rate(dpi->tvd_clk); vm.pixelclock = pll_rate / factor; - clk_set_rate(dpi->pixel_clk, vm.pixelclock); + if ((dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_LE) || + (dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_BE)) + clk_set_rate(dpi->pixel_clk, vm.pixelclock * 2); + else + clk_set_rate(dpi->pixel_clk, vm.pixelclock); + + vm.pixelclock = clk_get_rate(dpi->pixel_clk); dev_dbg(dpi->dev, "Got PLL %lu Hz, pixel clock %lu Hz\n",
@@ -519,6 +540,7 @@ 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);
@@ -800,6 +822,8 @@ static int mtk_dpi_probe(struct platform_device *pdev) return ret; } + dpi->output_fmt = MEDIA_BUS_FMT_RGB888_1X24; + return 0; }
--
2.18.0
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