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drm/edid: Reset more of the display info 

We're currently failing to reset everything in display_info.hdmi
which will potentially cause us to use stale information when
swapping monitors. Eg. if the user replaces a HDMI 2.0 monitor
with a HDMI 1.x monitor we will continue to think that the monitor
supports scrambling. That will lead to a black screen since the
HDMI 1.x monitor won't understand the scrambled signal.

Fix the problem by clearing display_info.hdmi fully. And while at
eliminate some duplicated code by calling drm_reset_display_info()
in drm_add_display_info().

Cc: stable@vger.kernel.org
Cc: Antony Chen <antonychen@qnap.com>
Cc: Shashank Sharma <shashank.sharma@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105655
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180424130250.7028-1-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Antony Chen <antonychen@qnap.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
hifive-unleashed-5.1
Ville Syrjälä 2018-04-24 16:02:50 +03:00 committed by Sean Paul
parent d02d270014
commit 1f6b8eef11
1 changed files with 3 additions and 8 deletions
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11
drivers/gpu/drm/drm_edid.c
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@ -4451,6 +4451,7 @@ drm_reset_display_info(struct drm_connector *connector)
info->max_tmds_clock = 0;
info->dvi_dual = false;
info->has_hdmi_infoframe = false;
memset(&info->hdmi, 0, sizeof(info->hdmi));
info->non_desktop = 0;
}
@ -4462,17 +4463,11 @@ u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edi
u32 quirks = edid_get_quirks(edid);
drm_reset_display_info(connector);
info->width_mm = edid->width_cm * 10;
info->height_mm = edid->height_cm * 10;
/* driver figures it out in this case */
info->bpc = 0;
info->color_formats = 0;
info->cea_rev = 0;
info->max_tmds_clock = 0;
info->dvi_dual = false;
info->has_hdmi_infoframe = false;
info->non_desktop = !!(quirks & EDID_QUIRK_NON_DESKTOP);
DRM_DEBUG_KMS("non_desktop set to %d\n", info->non_desktop);