From 3d565a21f2ce1f37479e91914734478c39b5c6fc Mon Sep 17 00:00:00 2001 From: Neil Armstrong Date: Wed, 20 Mar 2019 09:11:10 +0100 Subject: [PATCH] drm/meson: fix TMDS clock filtering for DMT monitors DMT monitors does not necessarely report a maximum TMDS clock in a VSDB EDID extension. In this case, all modes are wrongly rejected, including the DRM fallback EDID. This patch only rejects modes whith clock > max_tmds_clock if the max_tmds_clock is specified. This will only reject 4:2:0 HDMI2.0 modes, who reports a clock > max_tmds_clock. Reported-by: Maxime Jourdan Fixes: d7d8fb7046b6 ("drm/meson: add HDMI div40 TMDS mode") Signed-off-by: Neil Armstrong Tested-by: Maxime Jourdan Reviewed-by: Maxime Jourdan Link: https://patchwork.freedesktop.org/patch/msgid/20190320081110.1718-1-narmstrong@baylibre.com --- drivers/gpu/drm/meson/meson_dw_hdmi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c index e28814f4ea6c..563953ec6ad0 100644 --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c @@ -569,7 +569,8 @@ dw_hdmi_mode_valid(struct drm_connector *connector, DRM_DEBUG_DRIVER("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode)); /* If sink max TMDS clock, we reject the mode */ - if (mode->clock > connector->display_info.max_tmds_clock) + if (connector->display_info.max_tmds_clock && + mode->clock > connector->display_info.max_tmds_clock) return MODE_BAD; /* Check against non-VIC supported modes */