linux-kernel - Re: [PATCH v1 1/2] drm/panel: simple: add Multi-Innotechnology MI1010AIT-1CP1

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Message-ID: <1462f001-a01f-9634-744c-8981f72663f6@pengutronix.de>
Date:   Thu, 5 Aug 2021 07:52:24 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Ulrich Ölmann <u.oelmann@...gutronix.de>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH v1 1/2] drm/panel: simple: add Multi-Innotechnology
 MI1010AIT-1CP1

Hello Oleksij,

On 05.08.21 06:37, Oleksij Rempel wrote:
> From: Sam Ravnborg <sam@...nborg.org>
> 
> The Multi Innotechnology is a 10.1" 1280x800 panel.
> 
> The datasheet did not specify specific values for sync, back, front porch.
> The values are a best guess based on values for similar panels.
> 
> Co-Developed-by: Sam Ravnborg <sam@...nborg.org>
> Co-Developed-by: Ulrich Ölmann <u.oelmann@...gutronix.de>
> Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> Signed-off-by: Ulrich Ölmann <u.oelmann@...gutronix.de>
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/gpu/drm/panel/panel-simple.c | 34 ++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 21939d4352cf..fda79a986d12 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -3033,6 +3033,37 @@ static const struct panel_desc mitsubishi_aa070mc01 = {
>  	.bus_flags = DRM_BUS_FLAG_DE_HIGH,
>  };
>  
> +static const struct display_timing multi_inno_mi1010ait_1cp_timing = {
> +	.pixelclock = { 68900000, 70000000, 73400000 },
> +	.hactive = { 1280, 1280, 1280 },
> +	.hfront_porch = { 30, 60, 71 },
> +	.hback_porch = { 30, 60, 71 },
> +	.hsync_len = { 10, 10, 48 },
> +	.vactive = { 800, 800, 800 },
> +	.vfront_porch = { 5, 10, 10 },
> +	.vback_porch = { 5, 10, 10 },
> +	.vsync_len = { 5, 6, 13 },
> +	.flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW |
> +		 DISPLAY_FLAGS_DE_HIGH,
> +};

Here you specify DISPLAY_FLAGS_DE_HIGH.

> +
> +static const struct panel_desc multi_inno_mi1010ait_1cp = {
> +	.timings = &multi_inno_mi1010ait_1cp_timing,
> +	.num_timings = 1,
> +	.bpc = 8,
> +	.size = {
> +		.width = 217,
> +		.height = 136,
> +	},
> +	.delay = {
> +		.enable = 50,
> +		.disable = 50,
> +	},
> +	.bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,
> +	.bus_flags = DRM_BUS_FLAG_DE_HIGH,

And here DRM_BUS_FLAG_DE_HIGH. I see that some other panels do this too
and some only specify one of them. Do you know if they are redundant
or one of them is ignored?

Cheers,
Ahmad

> +	.connector_type = DRM_MODE_CONNECTOR_LVDS,
> +};
> +
>  static const struct display_timing nec_nl12880bc20_05_timing = {
>  	.pixelclock = { 67000000, 71000000, 75000000 },
>  	.hactive = { 1280, 1280, 1280 },
> @@ -4464,6 +4495,9 @@ static const struct of_device_id platform_of_match[] = {
>  	}, {
>  		.compatible = "mitsubishi,aa070mc01-ca1",
>  		.data = &mitsubishi_aa070mc01,
> +	}, {
> +		.compatible = "multi-inno,mi1010ait-1cp",
> +		.data = &multi_inno_mi1010ait_1cp,
>  	}, {
>  		.compatible = "nec,nl12880bc20-05",
>  		.data = &nec_nl12880bc20_05,
> 


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