linux-kernel - Re: [linux-sunxi] Re: [PATCH v2 2/5] drm: panel: Add Starry KR070PE2T

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Date:   Mon, 29 Jun 2020 12:59:02 +0200
From:   Pascal Roeleven <dev@...calroeleven.nl>
To:     laurent.pinchart@...asonboard.com
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] Re: [PATCH v2 2/5] drm: panel: Add Starry KR070PE2T

Hi Laurent,

Good catch. It's actually the connector type which is wrong. The 
connector_type should be DRM_MODE_CONNECTOR_DPI. If you would include 
this in your patch series, you can have my acked-by.

Regards,
Pascal

On 2020-06-28 09:28, Laurent Pinchart wrote:
> Hi Pascal,
> 
> On Fri, Mar 20, 2020 at 12:21:33PM +0100, Pascal Roeleven wrote:
>> The KR070PE2T is a 7" panel with a resolution of 800x480.
>> 
>> KR070PE2T is the marking present on the ribbon cable. As this panel is
>> probably available under different brands, this marking will catch
>> most devices.
>> 
>> As I can't find a datasheet for this panel, the bus_flags are instead
>> from trial-and-error. The flags seem to be common for these kind of
>> panels as well.
>> 
>> Signed-off-by: Pascal Roeleven <dev@...calroeleven.nl>
>> ---
>>  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 e14c14ac6..b3d257257 100644
>> --- a/drivers/gpu/drm/panel/panel-simple.c
>> +++ b/drivers/gpu/drm/panel/panel-simple.c
>> @@ -2842,6 +2842,32 @@ static const struct panel_desc 
>> shelly_sca07010_bfn_lnn = {
>>  	.bus_format = MEDIA_BUS_FMT_RGB666_1X18,
>>  };
>> 
>> +static const struct drm_display_mode starry_kr070pe2t_mode = {
>> +	.clock = 33000,
>> +	.hdisplay = 800,
>> +	.hsync_start = 800 + 209,
>> +	.hsync_end = 800 + 209 + 1,
>> +	.htotal = 800 + 209 + 1 + 45,
>> +	.vdisplay = 480,
>> +	.vsync_start = 480 + 22,
>> +	.vsync_end = 480 + 22 + 1,
>> +	.vtotal = 480 + 22 + 1 + 22,
>> +	.vrefresh = 60,
>> +};
>> +
>> +static const struct panel_desc starry_kr070pe2t = {
>> +	.modes = &starry_kr070pe2t_mode,
>> +	.num_modes = 1,
>> +	.bpc = 8,
>> +	.size = {
>> +		.width = 152,
>> +		.height = 86,
>> +	},
>> +	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
>> +	.bus_flags = DRM_BUS_FLAG_DE_HIGH | 
>> DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
>> +	.connector_type = DRM_MODE_CONNECTOR_LVDS,
> 
> I'm trying to fix inconsistencies in the panel-simple driver, and this
> caught my eyes. MEDIA_BUS_FMT_RGB888_1X24 isn't a correct format for
> LVDS panels. MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,
> MEDIA_BUS_FMT_RGB888_1X7X4_SPWG or MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA
> should be used instead. As I couldn't find documentation for the panel,
> I can't tell which format is correct. Could you please help ?
> 
>> +};
>> +
>>  static const struct drm_display_mode starry_kr122ea0sra_mode = {
>>  	.clock = 147000,
>>  	.hdisplay = 1920,
>> @@ -3474,6 +3500,9 @@ static const struct of_device_id 
>> platform_of_match[] = {
>>  	}, {
>>  		.compatible = "shelly,sca07010-bfn-lnn",
>>  		.data = &shelly_sca07010_bfn_lnn,
>> +	}, {
>> +		.compatible = "starry,kr070pe2t",
>> +		.data = &starry_kr070pe2t,
>>  	}, {
>>  		.compatible = "starry,kr122ea0sra",
>>  		.data = &starry_kr122ea0sra,
> 
> --
> Regards,
> 
> Laurent Pinchart