Hi all,
The patch works: drivers/gpu/drm/drm_edid.c
I switch 4K@60 and 4K@30 monitors some times, monitors show correct output.
Thanks for your help.
What are the steps to close the issue in freedesktop? Append the patch by Ville Syrjälä, then I close it?
Antony
2018-04-25 3:36 GMT+08:00 Daniel Vetter <daniel@xxxxxxxx>:
On Tue, Apr 24, 2018 at 05:26:30PM +0300, Ville Syrjälä wrote:
> 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.
Hm ... I guess my brain wasn't fully working.
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
as-is.
-Daniel
>
> >
> > 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@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch
>
> --
> Ville Syrjälä
> Intel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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