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

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Message-ID: <YqObYPttYuRDikrO@ravnborg.org>
Date:   Fri, 10 Jun 2022 21:28:32 +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.
On Fri, Jun 10, 2022 at 07:47:20PM +0200, Stephen Kitt wrote:
> Hi Sebastian,
> 
> On Thu, 9 Jun 2022 23:52:36 +0200, Sebastian Reichel
> <sebastian.reichel@...labora.com> wrote:
> > On Tue, Jun 07, 2022 at 08:20:25PM +0200, Stephen Kitt wrote:
> > > diff --git a/drivers/gpu/drm/panel/panel-dsi-cm.c
> > > b/drivers/gpu/drm/panel/panel-dsi-cm.c index b58cb064975f..aa36dc6cedd3
> > > 100644 --- a/drivers/gpu/drm/panel/panel-dsi-cm.c
> > > +++ b/drivers/gpu/drm/panel/panel-dsi-cm.c
> > > @@ -86,16 +86,10 @@ static void dsicm_bl_power(struct panel_drv_data
> > > *ddata, bool enable) return;
> > >  
> > >  	if (enable) {
> > > -		backlight->props.fb_blank = FB_BLANK_UNBLANK;
> > > -		backlight->props.state = ~(BL_CORE_FBBLANK |
> > > BL_CORE_SUSPENDED);
> > > -		backlight->props.power = FB_BLANK_UNBLANK;
> > > +		backlight_enable(backlight);
> > >  	} else {
> > > -		backlight->props.fb_blank = FB_BLANK_NORMAL;
> > > -		backlight->props.power = FB_BLANK_POWERDOWN;
> > > -		backlight->props.state |= BL_CORE_FBBLANK |
> > > BL_CORE_SUSPENDED;
> > > +		backlight_disable(backlight);
> > >  	}  
> > 
> > The brackets can be removed now. Otherwise:
> 
> > 
> > Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> 
> 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.

	Sam