Re: [Intel-gfx] [PATCH v3 13/13] drm/i915: replace drm_detect_hdmi_monitor() with drm_display_info.is_hdmi

Ville Syrjälä
2021-10-22T12:02:07Z

On Fri, Oct 22, 2021 at 12:25:33PM +0200, Claudio Suarez wrote:
> On Thu, Oct 21, 2021 at 04:49:59PM +0300, Ville Syrjälä wrote:
> > On Wed, Oct 20, 2021 at 12:51:21AM +0200, Claudio Suarez wrote:
> > > drm_get_edid() internally calls to drm_connector_update_edid_property()
> > > and then drm_add_display_info(), which parses the EDID.
> > > This happens in the function intel_hdmi_set_edid() and
> > > intel_sdvo_tmds_sink_detect() (via intel_sdvo_get_edid()).
> > >
> > > Once EDID is parsed, the monitor HDMI support information is available
> > > through drm_display_info.is_hdmi. Retriving the same information with
> > > drm_detect_hdmi_monitor() is less efficient. Change to
> > > drm_display_info.is_hdmi
> >
> > I meant we need to examine all call chains that can lead to
> > .detect() to make sure all of them do in fact update the
> > display_info beforehand.
>
> Well, I studied it carefully and, yes, all call chains that can lead to
> drm_display_info.is_hdmi / drm_detect_hdmi_monitor() update display_info
> beforehand. In the case that this doesn't happen, the code is unchanged.
>
> Do you want I explain the changes in the code here again ? Or do you want
> to me change the commit message to be more clear ? In the first case, I can
> write here a detailed explanation. In the second case I can make a longer commit
> message.
>
> Or both?

I want all those call chains explained in the commit message,
otherwise I have no easy way to confirm whether the change
is correct or not.

--
Ville Syrjälä
Intel