linux-kernel - Re: [PATCH 2/3] drm/panel: panel-dsi-cm: Use backlight helpers

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Message-ID: <YqOmRTVGQMXy2HVM@ravnborg.org>
Date:   Fri, 10 Jun 2022 22:15:01 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Stephen Kitt <steve@....org>
Cc:     Sebastian Reichel <sebastian.reichel@...labora.com>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH 2/3] drm/panel: panel-dsi-cm: Use backlight helpers

Hi Stephen,
> > > > 
> > > > Thanks, I’ll wait a little more to see if there are any other reviews of
> > > > the patches and then push a v2 with that fix.    
> > > It would be very nice if you could kill all uses of FB_BLANK in the
> > > drivers/gpu/drm/panel/* drivers, and post them as one series.
> > > This is long overdue to introduce the backlight helpers.
> > > 
> > > The three you posted is already a nice step forward, and there may be
> > > more panel drivers I have missed.  
> > 
> > With this series on top of 5.19-rc1, the only remaining .fb_blank reference
> > is in acx565akm_backlight_init() in panel-sony-acx565akm.c; I was planning
> > on nuking that along with the other .fb_blank initialisers in a series
> > removing .fb_blank entirely from backlight_properties. I’ll add it as a
> > fourth patch for drm/panel if that makes things easier!
> 
> That’s in drivers/gpu/drm/panel of course, there are a few others elsewhere
> (I’ve got patches in flight for most of them, I’ve got the rest ready for
> submission).
> 
> > There will still be references to FB_BLANK constants since they’re used for
> > backlight_properties.power values. Would it make sense to rename those?
> 
> Just to make sure — I’m cleaning up backlight_properties.fb_blank, not
> fb_ops.fb_blank. I wasn’t planning on touching the latter...

Nuking props.fb_blank - that a fine goal - so keep focus there.
We can then later revisit the other clean-up possibilities.

Since you do this tree-wide do not do the mistake and try to cover too
much at the same time, because then you never finish.
So forget my comment for now and keep up the good work on removing
props.fb_blank.

	Sam