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drm: don't add inferred modes for monitors that don't support them
If bit 0 of the features byte (0x18) is set to 0, then, according to the EDID spec, "the display is non-continuous frequency (multi-mode) and is only specified to accept the video timing formats that are listed in Base EDID and certain Extension Blocks". For more information, please see the EDID spec, check the notes of the table that explains the "Feature Support" byte (18h) and also the notes on the tables of the section that explains "Display Range Limits & Additional Timing Description Definition (tag #FDh)". Cc: stable@vger.kernel.org Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=45729 Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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1 changed files with 2 additions and 1 deletions
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@ -2054,7 +2054,8 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
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num_modes += add_cvt_modes(connector, edid);
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num_modes += add_standard_modes(connector, edid);
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num_modes += add_established_modes(connector, edid);
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num_modes += add_inferred_modes(connector, edid);
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if (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)
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num_modes += add_inferred_modes(connector, edid);
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num_modes += add_cea_modes(connector, edid);
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if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
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