On Tue, Apr 24, 2018 at 04:18:37PM +0200, Daniel Vetter wrote: > On Tue, Apr 24, 2018 at 04:02:50PM +0300, Ville Syrjala wrote: > > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > > > 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: Antony Chen <antonychen@xxxxxxxx> > > Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx> > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105655 > > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > --- > > drivers/gpu/drm/drm_edid.c | 11 +++-------- > > 1 file changed, 3 insertions(+), 8 deletions(-) > > > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > > index 134069f36482..39f1db4acda4 100644 > > --- a/drivers/gpu/drm/drm_edid.c > > +++ b/drivers/gpu/drm/drm_edid.c > > @@ -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); > > + > > Strictly speaking this is a separate bugfix, for the case where you > immediately go from one output to a different one. Keith already fixed the > case where at least somewhere in between you go to the disconnected state > in: > > commit 170178fe99dd212bf25e70c89bc4b6e195564ffc > Author: Keith Packard <keithp@xxxxxxxxxx> > Date: Wed Dec 13 00:44:26 2017 -0800 > > drm: Update edid-derived drm_display_info fields at edid property set [v2] > > With the above explained in the commit message: The drm_reset_display_info() call is just the "deduplicate the code" part. The memset() is the bugfix, and applies in all cases. > > Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> > > > 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); > > -- > > 2.16.1 > > > > _______________________________________________ > > Intel-gfx mailing list > > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx > > -- > Daniel Vetter > Software Engineer, Intel Corporation > http://blog.ffwll.ch -- Ville Syrjälä Intel _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
