linux-kernel - RE: [PATCH 3/3] drm/panel: simple: Add Newhaven ATXL#-CTP panel

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Message-ID: <TY2PR01MB29248DC3123F2AFAE80005F2DFAF0@TY2PR01MB2924.jpnprd01.prod.outlook.com>
Date:   Mon, 27 Apr 2020 11:03:58 +0000
From:   Gareth Williams <gareth.williams.jx@...esas.com>
To:     Sam Ravnborg <sam@...nborg.org>
CC:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/3] drm/panel: simple: Add Newhaven ATXL#-CTP panel

Hi Sam,

Thanks for giving feedback. When I send out v2 I'll CC you on the rest of the series
to be sure you have visibility. My responses are below.

> On Mon, Apr 27, 2020 at 09:41:49AM +0100, Sam Ravnborg wrote:
> Hi Gareth.
> 
> Looking forward to see the other patches - they seem to be stuck awaiting
> approval.
> 
> A few comments in the following.
> 
> 	Sam
> 
> On Mon, Apr 27, 2020 at 09:21:49AM +0100, Gareth Williams wrote:
> > This commit adds support for the Newhaven ATXL#-CTP panel used by the
> > Renesas RZ/N1 Demo Board.
> >
> > Signed-off-by: Gareth Williams <gareth.williams.jx@...esas.com>
> > ---
> >  drivers/gpu/drm/panel/panel-simple.c | 27
> +++++++++++++++++++++++++++
> >  1 file changed, 27 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/panel/panel-simple.c
> > b/drivers/gpu/drm/panel/panel-simple.c
> > index 5a93c4e..0b57b0e 100644
> > --- a/drivers/gpu/drm/panel/panel-simple.c
> > +++ b/drivers/gpu/drm/panel/panel-simple.c
> > @@ -2021,6 +2021,30 @@ static const struct panel_desc
> newhaven_nhd_43_480272ef_atxl = {
> >  		     DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE,  };
> >
> > +static const struct display_timing
> newhaven_nhd_50_800480tf_atxl_timing = {
> > +	.pixelclock = { 33300000, 33400000, 33500000 },
> > +	.hactive = { 800, 800, 800 },
> > +	.hfront_porch = { 40, 40, 40 },
> > +	.hback_porch = { 88, 88, 88 },
> > +	.hsync_len = { 1, 1, 1 },
> > +	.vactive = { 480, 480, 480 },
> > +	.vfront_porch = { 13, 13, 13 },
> > +	.vback_porch = { 32, 32, 32 },
> > +	.vsync_len = { 3, 3, 3 },
> > +	.flags = DISPLAY_FLAGS_HSYNC_HIGH |
> DISPLAY_FLAGS_VSYNC_HIGH, };
> > +
> > +static const struct panel_desc newhaven_nhd_50_800480tf_atxl = {
> > +		.timings = &newhaven_nhd_50_800480tf_atxl_timing,
> > +		.num_timings = 1,
> > +		.bpc = 8,
> > +		.size = {
> > +			.width = 400,
> > +			.height = 300,
> > +		},
> > +		.bus_flags = DRM_BUS_FLAG_DE_HIGH,
> Please add DRM_BUS_FLAG_PIXDATA too - as I assume this is an LVDS panel.

This is an RGB interface, however the manual lists that the rising edge is
being used so I will include the DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
flag.

> 
> > +};
> For new panels .connector_type is mandatory.
Okay, I will include this in v2 of the series.

> 
> 
> > +
> >  static const struct display_timing nlt_nl192108ac18_02d_timing = {
> >  	.pixelclock = { 130000000, 148350000, 163000000 },
> >  	.hactive = { 1920, 1920, 1920 },
> > @@ -2964,6 +2988,9 @@ static const struct of_device_id
> platform_of_match[] = {
> >  		.compatible = "newhaven,nhd-4.3-480272ef-atxl",
> >  		.data = &newhaven_nhd_43_480272ef_atxl,
> >  	}, {
> > +		.compatible = "newhaven,nhd-5.0-800480tf-atxl",
> > +		.data = &newhaven_nhd_50_800480tf_atxl,
> > +	}, {
> 
> I did not see the other patches - so this is maybe covered.
> But newhaven,nhd-5.0-800480tf-atxl must be documented in panel-
> simple.yaml before we can apply this.

I will include a separate documentation patch in v2 with you
on CC for this.


> 
> 	Sam
> 
> >  		.compatible = "nlt,nl192108ac18-02d",
> >  		.data = &nlt_nl192108ac18_02d,
> >  	}, {
> > --
> > 2.7.4

	Gareth