Re: [PATCH v3 19/21] drm/panel: simple: Add support for Toshiba LTA089AC29000 panel

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Boris Brezillon <boris.brezillon@collabora.com>
Cc: dri-devel@lists.freedesktop.org,
	Lucas Stach <l.stach@pengutronix.de>,
	Chris Healy <cphealy@gmail.com>,
	Andrey Smirnov <andrew.smirnov@gmail.com>,
	Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
	kernel@collabora.com, Daniel Vetter <daniel@ffwll.ch>,
	Inki Dae <inki.dae@samsung.com>,
	Joonyoung Shim <jy0922.shim@samsung.com>,
	Seung-Woo Kim <sw0312.kim@samsung.com>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Sam Ravnborg <sam@ravnborg.org>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Rob Clark <robdclark@gmail.com>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org
Subject: Re: [PATCH v3 19/21] drm/panel: simple: Add support for Toshiba LTA089AC29000 panel
Date: Mon, 2 Dec 2019 19:17:24 +0200	[thread overview]
Message-ID: <20191202171724.GS4929@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20191023154512.9762-20-boris.brezillon@collabora.com>

Hi Boris,

Thank you for the patch.

On Wed, Oct 23, 2019 at 05:45:10PM +0200, Boris Brezillon wrote:
> Add a new entry for the Toshiba LTA089AC29000 panel.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
> ---
> Changes in v3:
> * None
> ---
>  drivers/gpu/drm/panel/panel-simple.c | 36 ++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 5d487686d25c..27c92b44bd95 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -2937,6 +2937,39 @@ static const struct panel_desc toshiba_lt089ac29000 = {
>  	.connector_type = DRM_MODE_CONNECTOR_LVDS,
>  };
>  
> +static const struct drm_display_mode toshiba_lta089ac29000_mode = {
> +	.clock = 79500,
> +	.hdisplay = 1280,
> +	.hsync_start = 1280 + 192,
> +	.hsync_end = 1280 + 192 + 128,
> +	.htotal = 1280 + 192 + 128 + 64,
> +	.vdisplay = 768,
> +	.vsync_start = 768 + 20,
> +	.vsync_end = 768 + 20 + 7,
> +	.vtotal = 768 + 20 + 7 + 3,
> +	.vrefresh = 60,
> +};
> +
> +static const struct panel_desc toshiba_lta089ac29000 = {
> +	.modes = &toshiba_lta089ac29000_mode,
> +	.num_modes = 1,
> +	.size = {
> +		.width = 194,
> +		.height = 116,
> +	},
> +	/*
> +	 * FIXME:
> +	 * The panel supports 2 bus formats: jeida-24 and jeida-18. The
> +	 * mode is selected through the 8b6b_SEL pin. If anyone ever needs
> +	 * support for jeida-18 we should probably parse the 'data-mapping'
> +	 * property.
> +	 * In the unlikely event where 8b6b_SEL is connected to a GPIO, we'd
> +	 * need a new infra to allow bus format negotiation at the panel level.
> +	 */
> +	.bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA,
> +	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
> +};
> +
>  static const struct drm_display_mode tpk_f07a_0102_mode = {
>  	.clock = 33260,
>  	.hdisplay = 800,
> @@ -3392,6 +3425,9 @@ static const struct of_device_id platform_of_match[] = {
>  	}, {
>  		.compatible = "toshiba,lt089ac29000",
>  		.data = &toshiba_lt089ac29000,
> +	}, {
> +		.compatible = "toshiba,lta089ac29000",

Is this really different than "toshiba,lt089ac29000" ? Both have the
exact same timing, the only difference is .bus_format, and according to
https://www.avnet-integrated.eu/fileadmin/user_upload/Files/Displays/Colour_TFT/LT089AC29000.pdf
the "toshiba,lt089ac29000" is an LVDS panel.

> +		.data = &toshiba_lta089ac29000,
>  	}, {
>  		.compatible = "tpk,f07a-0102",
>  		.data = &tpk_f07a_0102,

-- 
Regards,

Laurent Pinchart