linux-kernel - Re: [PATCH v5 2/2] drm/panel: simple: Add Satoz SAT050AT40H12R2 panel support

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Message-ID: <20200628072444.GA8391@pendragon.ideasonboard.com>
Date:   Sun, 28 Jun 2020 10:24:44 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v5 2/2] drm/panel: simple: Add Satoz SAT050AT40H12R2
 panel support

Hi Miquel,

On Thu, Jan 09, 2020 at 07:40:37PM +0100, Miquel Raynal wrote:
> Add support for the Satoz SAT050AT40H12R2 panel.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
> 
> Changes since v4:
> * None.
> 
> Changes since v3:
> * Added connector type.
> 
> Changes since v2:
> * Dropped two uneeded lines which would fail the build.
> 
> Changes since v1:
> * Switched to display_timing's instead of display_mode.
> 
>  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 aaa08beac13c..1aa6622abc49 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -2577,6 +2577,30 @@ static const struct panel_desc samsung_ltn140at29_301 = {
>  	},
>  };
>  
> +static const struct display_timing satoz_sat050at40h12r2_timing = {
> +	.pixelclock = {33300000, 33300000, 50000000},
> +	.hactive = {800, 800, 800},
> +	.hfront_porch = {16, 210, 354},
> +	.hback_porch = {46, 46, 46},
> +	.hsync_len = {1, 1, 40},
> +	.vactive = {480, 480, 480},
> +	.vfront_porch = {7, 22, 147},
> +	.vback_porch = {23, 23, 23},
> +	.vsync_len = {1, 1, 20},
> +};
> +
> +static const struct panel_desc satoz_sat050at40h12r2 = {
> +	.timings = &satoz_sat050at40h12r2_timing,
> +	.num_timings = 1,
> +	.bpc = 8,
> +	.size = {
> +		.width = 108,
> +		.height = 65,
> +	},
> +	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
> +	.connector_type = DRM_MODE_CONNECTOR_LVDS,

I'm trying to fix inconsistencies in the panel-simple driver, and this
caught my eyes. MEDIA_BUS_FMT_RGB888_1X24 isn't a correct format for
LVDS panels. MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,
MEDIA_BUS_FMT_RGB888_1X7X4_SPWG or MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA
should be used instead. As I couldn't find documentation for the panel,
I can't tell which format is correct. Could you please help ?

> +};
> +
>  static const struct drm_display_mode sharp_ld_d5116z01b_mode = {
>  	.clock = 168480,
>  	.hdisplay = 1920,
> @@ -3377,6 +3401,9 @@ static const struct of_device_id platform_of_match[] = {
>  	}, {
>  		.compatible = "samsung,ltn140at29-301",
>  		.data = &samsung_ltn140at29_301,
> +	}, {
> +		.compatible = "satoz,sat050at40h12r2",
> +		.data = &satoz_sat050at40h12r2,
>  	}, {
>  		.compatible = "sharp,ld-d5116z01b",
>  		.data = &sharp_ld_d5116z01b,

-- 
Regards,

Laurent Pinchart