[PATCH v2 1/3] drm/mediatek: mtk_dpi: Add check for max clock rate in mode_valid
From: Jitao Shi <hidden>
Date: 2021-02-08 01:28:18
Also in:
dri-devel, linux-arm-kernel, linux-devicetree, lkml
Subsystem:
drm drivers, drm drivers for mediatek, the rest · Maintainers:
David Airlie, Simona Vetter, Chun-Kuang Hu, Philipp Zabel, Linus Torvalds
Add per-platform max clock rate check in mtk_dpi_bridge_mode_valid. Signed-off-by: Jitao Shi <redacted> --- drivers/gpu/drm/mediatek/mtk_dpi.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 52f11a63a330..ffa4a0f1989f 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c@@ -118,6 +118,7 @@ struct mtk_dpi_yc_limit { struct mtk_dpi_conf { unsigned int (*cal_factor)(int clock); u32 reg_h_fre_con; + u32 max_clock_khz; bool edge_sel_en; };
@@ -555,9 +556,22 @@ static void mtk_dpi_bridge_enable(struct drm_bridge *bridge) mtk_dpi_set_display_mode(dpi, &dpi->mode); } +static enum drm_mode_status +mtk_dpi_bridge_mode_valid(struct drm_bridge *bridge, + const struct drm_display_mode *mode) +{ + struct mtk_dpi *dpi = bridge_to_dpi(bridge); + + if (dpi->conf->max_clock_khz && mode->clock > dpi->conf->max_clock_khz) + return MODE_CLOCK_HIGH; + + return MODE_OK; +} + static const struct drm_bridge_funcs mtk_dpi_bridge_funcs = { .attach = mtk_dpi_bridge_attach, .mode_set = mtk_dpi_bridge_mode_set, + .mode_valid = mtk_dpi_bridge_mode_valid, .disable = mtk_dpi_bridge_disable, .enable = mtk_dpi_bridge_enable, };
@@ -673,17 +687,20 @@ static unsigned int mt8183_calculate_factor(int clock) static const struct mtk_dpi_conf mt8173_conf = { .cal_factor = mt8173_calculate_factor, .reg_h_fre_con = 0xe0, + .max_clock_khz = 300000, }; static const struct mtk_dpi_conf mt2701_conf = { .cal_factor = mt2701_calculate_factor, .reg_h_fre_con = 0xb0, .edge_sel_en = true, + .max_clock_khz = 150000, }; static const struct mtk_dpi_conf mt8183_conf = { .cal_factor = mt8183_calculate_factor, .reg_h_fre_con = 0xe0, + .max_clock_khz = 100000, }; static int mtk_dpi_probe(struct platform_device *pdev)
--
2.25.1
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