linux-kernel - Re: [PATCH 1/2] drm/panel: Add Starry KR070PE2T

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Date:   Tue, 10 Mar 2020 19:54:23 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Pascal Roeleven <dev@...calroeleven.nl>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 1/2] drm/panel: Add Starry KR070PE2T

Hi Pascal.

Thanks for submitting.

On Tue, Mar 10, 2020 at 11:27:23AM +0100, Pascal Roeleven wrote:
> The KR070PE2T is a 7" panel with a resolution of 800x480.
> 
> KR070PE2T is the marking present on the ribbon cable. As this panel is
> probably available under different brands, this marking will catch
> most devices.
> 
> Signed-off-by: Pascal Roeleven <dev@...calroeleven.nl>

A few things to improve.

The binding should be a separate patch.
subject - shall start with dt-bindings:
Shall be sent to deveicetree mailing list.

For panel we no longer accept .txt bindings.
But the good news is that since the panel is simple,
you only need to list your compatible in the file
bindings/display/panel/panel-simple.yaml
- must be en alphabetical order
- vendor prefix must be present in vendor-prefixes



> ---
>  .../display/panel/starry,kr070pe2t.txt        |  7 +++++
>  drivers/gpu/drm/panel/panel-simple.c          | 26 +++++++++++++++++++
>  2 files changed, 33 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt b/Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt
> new file mode 100644
> index 000000000..699ad5eb2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt
> @@ -0,0 +1,7 @@
> +Starry 7" (800x480 pixels) LCD panel
> +
> +Required properties:
> +- compatible: should be "starry,kr070pe2t"
> +
> +This binding is compatible with the simple-panel binding, which is specified
> +in simple-panel.txt in this directory.
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index e14c14ac6..027a2612b 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -2842,6 +2842,29 @@ static const struct panel_desc shelly_sca07010_bfn_lnn = {
>  	.bus_format = MEDIA_BUS_FMT_RGB666_1X18,
>  };
>  
> +static const struct drm_display_mode starry_kr070pe2t_mode = {
> +	.clock = 33000,
> +	.hdisplay = 800,
> +	.hsync_start = 800 + 209,
> +	.hsync_end = 800 + 209 + 1,
> +	.htotal = 800 + 209 + 1 + 45,
> +	.vdisplay = 480,
> +	.vsync_start = 480 + 22,
> +	.vsync_end = 480 + 22 + 1,
> +	.vtotal = 480 + 22 + 1 + 22,
> +	.vrefresh = 60,
> +};

Please adjust so:
vrefresh * htotal * vtotal == clock.
I cannot say what needs to be adjusted.
But we are moving away from specifying vrefresh and want the
data to be OK.

> +
> +static const struct panel_desc starry_kr070pe2t = {
> +	.modes = &starry_kr070pe2t_mode,
> +	.num_modes = 1,
> +	.bpc = 8,
> +	.size = {
> +		.width = 152,
> +		.height = 86,
> +	},
> +};

For this part specifying the connector type is today mandatory.
And please investigate if you can be more precise concerning
bus_format, flags, etc.
See also what other panels do in the same file.

	Sam


> +
>  static const struct drm_display_mode starry_kr122ea0sra_mode = {
>  	.clock = 147000,
>  	.hdisplay = 1920,
> @@ -3474,6 +3497,9 @@ static const struct of_device_id platform_of_match[] = {
>  	}, {
>  		.compatible = "shelly,sca07010-bfn-lnn",
>  		.data = &shelly_sca07010_bfn_lnn,
> +	}, {
> +		.compatible = "starry,kr070pe2t",
> +		.data = &starry_kr070pe2t,
>  	}, {
>  		.compatible = "starry,kr122ea0sra",
>  		.data = &starry_kr122ea0sra,
> -- 
> 2.20.1