[PATCH v4 3/3] drm/mediatek: fix the wrong pixel clock when resolution is 4K
From: Bibby Hsieh <hidden>
Date: 2016-08-17 06:58:19
Also in:
dri-devel, linux-mediatek, lkml
Subsystem:
drm drivers, drm drivers for mediatek, the rest · Maintainers:
David Airlie, Simona Vetter, Chun-Kuang Hu, Philipp Zabel, Linus Torvalds
From: Junzhi Zhao <redacted> Pixel clock should be 297MHz when resolution is 4K. Signed-off-by: Junzhi Zhao <redacted> Signed-off-by: Bibby Hsieh <redacted> --- drivers/gpu/drm/mediatek/mtk_dpi.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 0186e50..90fb831 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c@@ -432,11 +432,16 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi, unsigned long pll_rate; unsigned int factor; + /* let pll_rate can fix the valid range of tvdpll (1G~2GHz) */ pix_rate = 1000UL * mode->clock; - if (mode->clock <= 74000) + if (mode->clock <= 27000) + factor = 16 * 3; + else if (mode->clock <= 84000) factor = 8 * 3; - else + else if (mode->clock <= 167000) factor = 4 * 3; + else + factor = 2 * 3; pll_rate = pix_rate * factor; dev_dbg(dpi->dev, "Want PLL %lu Hz, pixel clock %lu Hz\n",
--
1.7.9.5