linux-kernel - Re: [PATCH 4/6] drm/panel: simple: Add support for Banana Pi 7" S070WV20-CT16 panel

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Message-ID: <58ce9e3b-00ee-87d2-f05b-b9f1414d1cfa@micronovasrl.com>
Date:   Thu, 19 Apr 2018 14:31:13 +0200
From:   Giulio Benetti <giulio.benetti@...ronovasrl.com>
To:     Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Jonathan Liu <net147@...il.com>
Subject: Re: [PATCH 4/6] drm/panel: simple: Add support for Banana Pi 7"
 S070WV20-CT16 panel

Hi,

Il 19/04/2018 11:32, Chen-Yu Tsai ha scritto:
> This panel is marketed as Banana Pi 7" LCD display. On the back is
> a sticker denoting the model name S070WV20-CT16.

Judging from the code, the real vendor should be CDTech.
Take a look at their website:
http://www.cdtech-lcd.com/en/standardscreen.html

I point you my patch for inserting another similar panel:
https://patchwork.freedesktop.org/patch/211914/

Maybe it would make sense to use CDTech as the vendor,
because maybe Bananapi resells only it.
Or maybe it is a custom panel done for them,
but the same is for other panels I've submitted patches.
Micronova srl custom, but vendor is CDTech.

What do you think?

-- 
Giulio Benetti
CTO

MICRONOVA SRL
Sede: Via A. Niedda 3 - 35010 Vigonza (PD)
Tel. 049/8931563 - Fax 049/8931346
Cod.Fiscale - P.IVA 02663420285
Capitale Sociale € 26.000 i.v.
Iscritta al Reg. Imprese di Padova N. 02663420285
Numero R.E.A. 258642

> 
> This is a 7" 800x480 panel connected through a 24-bit RGB interface.
> However the panel only does 262k colors.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>   .../display/panel/bananapi,s070wv20-ct16.txt  |  7 ++++++
>   drivers/gpu/drm/panel/panel-simple.c          | 25 +++++++++++++++++++
>   2 files changed, 32 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/display/panel/bananapi,s070wv20-ct16.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/bananapi,s070wv20-ct16.txt b/Documentation/devicetree/bindings/display/panel/bananapi,s070wv20-ct16.txt
> new file mode 100644
> index 000000000000..2ec35ce36e9a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/bananapi,s070wv20-ct16.txt
> @@ -0,0 +1,7 @@
> +Banana Pi 7" (S070WV20-CT16) TFT LCD Panel
> +
> +Required properties:
> +- compatible: should be "bananapi,s070wv20-ct16"
> +
> +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 cbf1ab404ee7..9bc037f74d6c 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -745,6 +745,28 @@ static const struct panel_desc avic_tm070ddh03 = {
>   	},
>   };
>   
> +static const struct drm_display_mode bananapi_s070wv20_ct16_mode = {
> +	.clock = 30000,
> +	.hdisplay = 800,
> +	.hsync_start = 800 + 40,
> +	.hsync_end = 800 + 40 + 48,
> +	.htotal = 800 + 40 + 48 + 40,
> +	.vdisplay = 480,
> +	.vsync_start = 480 + 13,
> +	.vsync_end = 480 + 13 + 3,
> +	.vtotal = 480 + 13 + 3 + 29,
> +};
> +
> +static const struct panel_desc bananapi_s070wv20_ct16 = {
> +	.modes = &bananapi_s070wv20_ct16_mode,
> +	.num_modes = 1,
> +	.bpc = 6,
> +	.size = {
> +		.width = 154,
> +		.height = 86,
> +	},
> +};
> +
>   static const struct drm_display_mode boe_nv101wxmn51_modes[] = {
>   	{
>   		.clock = 71900,
> @@ -2112,6 +2134,9 @@ static const struct of_device_id platform_of_match[] = {
>   	}, {
>   		.compatible = "avic,tm070ddh03",
>   		.data = &avic_tm070ddh03,
> +	}, {
> +		.compatible = "bananapi,s070wv20-ct16",
> +		.data = &bananapi_s070wv20_ct16,
>   	}, {
>   		.compatible = "boe,nv101wxmn51",
>   		.data = &boe_nv101wxmn51,
>