On Wed, May 29, 2019 at 06:50:40PM +0200, Mario Kleiner wrote:
> On Wed, May 29, 2019 at 7:02 AM Ville Syrjala
> <[email protected]> wrote:
> >
> > From: Ville Syrjälä <[email protected]>
> >
> > From VESA EDID implementation guide v1.0:
> > "For EDID version 1 revision 2 or earlier data structures when offset 14h
> > bit 7 is set to one, the value of bits 6-0 are undefined, and therefore
> > cannot be interpreted to mean anything."
> >
> > And since EDID 1.4 redefines that bit let's consult it only for
> > EDID 1.3.
> >
> > Cc: Mario Kleiner <[email protected]>
> > Signed-off-by: Ville Syrjälä <[email protected]>
>
> Yes. Series is:
> Reviewed-by: Mario Kleiner <[email protected]>
>
> -mario
>
> On Wed, May 29, 2019 at 3:50 PM Alex Deucher <[email protected]> wrote:
> >
> > On Wed, May 29, 2019 at 7:02 AM Ville Syrjala
> > <[email protected]> wrote:
> > >
> > > From: Ville Syrjälä <[email protected]>
> > >
> > > From VESA EDID implementation guide v1.0:
> > > "For EDID version 1 revision 2 or earlier data structures when offset 14h
> > > bit 7 is set to one, the value of bits 6-0 are undefined, and therefore
> > > cannot be interpreted to mean anything."
> > >
> > > And since EDID 1.4 redefines that bit let's consult it only for
> > > EDID 1.3.
> > >
> > > Cc: Mario Kleiner <[email protected]>
> > > Signed-off-by: Ville Syrjälä <[email protected]>
> >
> > Series is:
> > Reviewed-by: Alex Deucher <[email protected]>
Thanks. Series pushed to drm-misc-next.
> >
> > > ---
> > > drivers/gpu/drm/drm_edid.c | 4 ++--
> > > 1 file changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> > > index dd601ed6a30e..c3296a72fff9 100644
> > > --- a/drivers/gpu/drm/drm_edid.c
> > > +++ b/drivers/gpu/drm/drm_edid.c
> > > @@ -4569,8 +4569,8 @@ u32 drm_add_display_info(struct drm_connector
> > > *connector, const struct edid *edi
> > > * tells us to assume 8 bpc color depth if the EDID doesn't have
> > > * extensions which tell otherwise.
> > > */
> > > - if ((info->bpc == 0) && (edid->revision < 4) &&
> > > - (edid->input & DRM_EDID_DIGITAL_DFP_1_X)) {
> > > + if (info->bpc == 0 && edid->revision == 3 &&
> > > + edid->input & DRM_EDID_DIGITAL_DFP_1_X) {
> > > info->bpc = 8;
> > > DRM_DEBUG("%s: Assigning DFP sink color depth as %d
> > > bpc.\n",
> > > connector->name, info->bpc);
> > > --
> > > 2.21.0
> > >
> > > _______________________________________________
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> > > [email protected]
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> > _______________________________________________
> > dri-devel mailing list
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> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Ville Syrjälä
Intel
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