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drm/meson: fix TMDS clock filtering for DMT monitors

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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 <mjourdan@baylibre.com>
Fixes: d7d8fb7046 ("drm/meson: add HDMI div40 TMDS mode")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Maxime Jourdan <mjourdan@baylibre.com>
Reviewed-by: Maxime Jourdan <mjourdan@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190320081110.1718-1-narmstrong@baylibre.com
This commit is contained in:
Neil Armstrong 2019-03-20 09:11:10 +01:00
parent 2d8f92897a
commit 3d565a21f2
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/meson/meson_dw_hdmi.c
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@ -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 */