linux-kernel - Re: [PATCH v2 3/3] drm/panel: simple: add CMT430B19N00 LCD panel support

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Message-ID: <20240304-inquisitive-kickass-pronghorn-c641ff@houat>
Date: Mon, 4 Mar 2024 17:25:50 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Jérémie Dautheribes <jeremie.dautheribes@...tlin.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, Thierry Reding <thierry.reding@...il.com>, 
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>, Yen-Mei Goh <yen-mei.goh@...sight.com>
Subject: Re: [PATCH v2 3/3] drm/panel: simple: add CMT430B19N00 LCD panel
 support

Hi,

On Mon, Mar 04, 2024 at 05:04:54PM +0100, Jérémie Dautheribes wrote:
> Add support for Crystal Clear Technology CMT430B19N00 4.3" 480x272
> TFT-LCD panel.
> 
> Signed-off-by: Jérémie Dautheribes <jeremie.dautheribes@...tlin.com>
> ---
>  drivers/gpu/drm/panel/panel-simple.c | 29 ++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 20e3df1c59d4..b940220f56e2 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -1457,6 +1457,32 @@ static const struct panel_desc boe_hv070wsa = {
>  	.connector_type = DRM_MODE_CONNECTOR_LVDS,
>  };
>  
> +static const struct drm_display_mode cct_cmt430b19n00_mode = {
> +	.clock = 9000,
> +	.hdisplay = 480,
> +	.hsync_start = 480 + 43,
> +	.hsync_end = 480 + 43 + 8,
> +	.htotal = 480 + 43 + 8 + 4,
> +	.vdisplay = 272,
> +	.vsync_start = 272 + 12,
> +	.vsync_end = 272 + 12 + 8,
> +	.vtotal = 272 + 12 + 8 + 4,
> +	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
> +};

Your pixel clock doesn't really match the rest of the timings:

(480 + 43 + 8 + 4) * (272 + 12 + 8 + 4) * 60 = 9501600

So a ~6% deviation.

What does the datasheet say?

Maxime

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