linux-kernel - Re: [PATCH 1/2] drm/panel: Add Starry KR070PE2T

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Message-ID: <280a128711458950b55b070dbf6f07a1@pascalroeleven.nl>
Date:   Wed, 11 Mar 2020 11:23:27 +0100
From:   Pascal Roeleven <dev@...calroeleven.nl>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 1/2] drm/panel: Add Starry KR070PE2T

On 2020-03-10 19:54, Sam Ravnborg wrote:
> A few things to improve.
> 
> The binding should be a separate patch.
> subject - shall start with dt-bindings:
> Shall be sent to deveicetree mailing list.

Hi Sam,

Thank you very much for your review.
I did consider this. The reason I combined the patches, is that the 
binding depends on the display so I thought they were related in some 
way. Didn't know the correct procedure to handle this. I will split them 
apart in v2.

>> ---
>>  .../display/panel/starry,kr070pe2t.txt        |  7 +++++
>>  drivers/gpu/drm/panel/panel-simple.c          | 26 
>> +++++++++++++++++++
>>  2 files changed, 33 insertions(+)
>>  create mode 100644 
>> Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt
>> 
>> diff --git 
>> a/Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt 
>> b/Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt
>> new file mode 100644
>> index 000000000..699ad5eb2
>> --- /dev/null
>> +++ 
>> b/Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt
>> @@ -0,0 +1,7 @@
>> +Starry 7" (800x480 pixels) LCD panel
>> +
>> +Required properties:
>> +- compatible: should be "starry,kr070pe2t"
>> +
>> +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 e14c14ac6..027a2612b 100644
>> --- a/drivers/gpu/drm/panel/panel-simple.c
>> +++ b/drivers/gpu/drm/panel/panel-simple.c
>> @@ -2842,6 +2842,29 @@ 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,
>> +};
> 
> Please adjust so:
> vrefresh * htotal * vtotal == clock.
> I cannot say what needs to be adjusted.
> But we are moving away from specifying vrefresh and want the
> data to be OK.

Just like Ville Syrjälä, I ran the numbers and vrefresh indeed 
calculates to 59.58.