linux-kernel - Re: [PATCH] drm/panel: add support for Innolux N156BGE-L21 panel

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Message-ID: <20140620201456.GA28814@mithrandir>
Date:	Fri, 20 Jun 2014 22:14:57 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Alban Bedel <alban.bedel@...onic-design.de>
Cc:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panel: add support for Innolux N156BGE-L21 panel

On Thu, Jun 12, 2014 at 05:09:05PM +0200, Alban Bedel wrote:
> This panel is used by the Medcom Wide and supported by the
> simple-panel driver.
> 
> Signed-off-by: Alban Bedel <alban.bedel@...onic-design.de>
> ---
>  drivers/gpu/drm/panel/panel-simple.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 309f29e..6a361bb 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -372,6 +372,28 @@ static const struct panel_desc samsung_ltn101nt05 = {
>  	},
>  };
>  
> +static const struct drm_display_mode innolux_n156bge_l21_mode = {
> +	.clock = 69300,
> +	.hdisplay = 1366,
> +	.hsync_start = 1366,
> +	.hsync_end = 1366,
> +	.htotal = 1366 + 100,
> +	.vdisplay = 768,
> +	.vsync_start = 768,
> +	.vsync_end = 768,
> +	.vtotal = 768 + 20,

The timings here look slightly strange. Typically

	.{h,v}display < .{h,v}sync_start < .{h,v}hsync_end < .{h,v}total

Given your timings above essentially means that the vsync pulse starts
immediately after the last active pixel or line and is of length zero.

> +	.vrefresh = 60,
> +};
> +
> +static const struct panel_desc innolux_n156bge_l21 = {
> +	.modes = &innolux_n156bge_l21_mode,
> +	.num_modes = 1,
> +	.size = {
> +		.width = 1366,
> +		.height = 768,

This size is the physical size (in mm) of the active area of the panel.

> +	},
> +};
> +
>  static const struct of_device_id platform_of_match[] = {
>  	{
>  		.compatible = "auo,b101aw03",
> @@ -389,6 +411,9 @@ static const struct of_device_id platform_of_match[] = {
>  		.compatible = "samsung,ltn101nt05",
>  		.data = &samsung_ltn101nt05,
>  	}, {
> +		.compatible = "innolux,n156bge-l21",
> +		.data = &innolux_n156bge_l21,
> +	}, {

This patch should also be adding a device tree binding document for this
panel.

Thierry

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