Hi Sam,
On Sun, Jun 28, 2020 at 09:52:45AM +0200, Sam Ravnborg wrote:
> On Sun, Jun 28, 2020 at 10:07:45AM +0300, Laurent Pinchart wrote:
> > 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@xxxxxxxxxxxxxxxx>
> >>>> Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
> >>>> ---
> >>>> 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.
Where would you add that documentation ? The hardest part is to find a
place that will be noticed by developers :-)
I've just submitted a patch that adds a WARN_ON to catch similar issues
in the panel-simple driver. It's not ideal as we really shouldn't have
such code in the kernel, this is something that should be caught as part
of the integration process.
> On the TODO list...
>
> >>> 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@xxxxxxxxxxxxxxxx>
--
Regards,
Laurent Pinchart
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