linux-kernel - Re: [PATCH v1 2/2] drm/panel-simple: Add missing BUS descriptions for some panels

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Message-ID: <20200628075245.GA128039@ravnborg.org>
Date:   Sun, 28 Jun 2020 09:52:45 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] drm/panel-simple: Add missing BUS descriptions
 for some panels

Hi Laurent.

On Sun, Jun 28, 2020 at 10:07:45AM +0300, Laurent Pinchart wrote:
> Hi Dmitry,
> 
> On Sun, Jun 28, 2020 at 02:44:15AM +0300, Dmitry Osipenko wrote:
> > 27.06.2020 23:43, Laurent Pinchart пишет:
> > > On Mon, Jun 22, 2020 at 01:27:42AM +0300, Dmitry Osipenko wrote:
> > >> This patch adds missing BUS fields to the display panel descriptions of
> > >> the panels which are found on NVIDIA Tegra devices:
> > >>
> > >>   1. AUO B101AW03
> > >>   2. Chunghwa CLAA070WP03XG
> > >>   3. Chunghwa CLAA101WA01A
> > >>   4. Chunghwa CLAA101WB01
> > >>   5. Innolux N156BGE L21
> > >>   6. Samsung LTN101NT05
> > >>
> > >> Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > >> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> > >> ---
> > >>  drivers/gpu/drm/panel/panel-simple.c | 12 ++++++++++++
> > >>  1 file changed, 12 insertions(+)
> > >>
> > >> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> > >> index 87edd2bdf09a..986df9937650 100644
> > >> --- a/drivers/gpu/drm/panel/panel-simple.c
> > >> +++ b/drivers/gpu/drm/panel/panel-simple.c
> > >> @@ -698,6 +698,8 @@ static const struct panel_desc auo_b101aw03 = {
> > >>  		.width = 223,
> > >>  		.height = 125,
> > >>  	},
> > >> +	.bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,
> > >> +	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
> > > 
> > > Does DRM_BUS_FLAG_PIXDATA_DRIVE_* make sense for LVDS ?
> > 
> > To be honest I don't know whether it make sense or not for LVDS. I saw
> > that other LVDS panels in panel-simple.c use the PIXDATA flag and then
> > looked at what timing diagrams in the datasheets show.
> 
> I think we should drop DRM_BUS_FLAG_PIXDATA_DRIVE_* for LVDS panels.
> I'll submit a patch.

We should also clean up all the DRM_BUS_FLAG_* one day.
No need for the deprecated values, so a few files needs an update.
And we could document what flags makes sense for LVDS etc.

On the TODO list...

	Sam
> 
> > > The rest looks good, except the Samsung panel for which I haven't been
> > > able to locate a datasheet.
> > > 
> > > Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > 
> > Thanks to you and Sam!
> 
> -- 
> Regards,
> 
> Laurent Pinchart