linux-kernel - Re: [PATCH v1 2/2] drm/panel-simple: Add missing BUS descriptions for some panels

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Date:   Sun, 28 Jun 2020 02:44:15 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] drm/panel-simple: Add missing BUS descriptions for
 some panels

27.06.2020 23:43, Laurent Pinchart пишет:
> Hi Dmitry,
> 
> Thank you for the patch.
> 
> On Mon, Jun 22, 2020 at 01:27:42AM +0300, Dmitry Osipenko wrote:
>> This patch adds missing BUS fields to the display panel descriptions of
>> the panels which are found on NVIDIA Tegra devices:
>>
>>   1. AUO B101AW03
>>   2. Chunghwa CLAA070WP03XG
>>   3. Chunghwa CLAA101WA01A
>>   4. Chunghwa CLAA101WB01
>>   5. Innolux N156BGE L21
>>   6. Samsung LTN101NT05
>>
>> Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> ---
>>  drivers/gpu/drm/panel/panel-simple.c | 12 ++++++++++++
>>  1 file changed, 12 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
>> index 87edd2bdf09a..986df9937650 100644
>> --- a/drivers/gpu/drm/panel/panel-simple.c
>> +++ b/drivers/gpu/drm/panel/panel-simple.c
>> @@ -698,6 +698,8 @@ static const struct panel_desc auo_b101aw03 = {
>>  		.width = 223,
>>  		.height = 125,
>>  	},
>> +	.bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,
>> +	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
> 
> Does DRM_BUS_FLAG_PIXDATA_DRIVE_* make sense for LVDS ?

To be honest I don't know whether it make sense or not for LVDS. I saw
that other LVDS panels in panel-simple.c use the PIXDATA flag and then
looked at what timing diagrams in the datasheets show.

> The rest looks good, except the Samsung panel for which I haven't been
> able to locate a datasheet.
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Thanks to you and Sam!