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 <mjourdan@baylibre.com>
Fixes: d7d8fb7046b6 ("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

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index e28814f4ea6cd2e05724ee46a0892b261d3d4cef..563953ec6ad03fd904c2e5c38de8cbe1dc2edce0 100644 (file)
--- 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 */