linux-kernel - Re: [PATCH v3 09/10] drm/rockchip: analogix_dp: update the comments about why need to hardcode VOP output mode

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Date:	Wed, 29 Jun 2016 14:42:09 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Sean Paul <seanpaul@...omium.org>
Cc:	Mark Yao <yzq@...k-chips.com>, Inki Dae <inki.dae@...sung.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	linux-rockchip@...ts.infradead.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Emil Velikov <emil.l.velikov@...il.com>,
	Douglas Anderson <dianders@...omium.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Tomasz Figa <tomasz.figa@...omium.com>,
	Stéphane Marchesin <marcheu@...omium.org>,
	Thierry Reding <treding@...dia.com>,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v3 09/10] drm/rockchip: analogix_dp: update the comments
 about why need to hardcode VOP output mode

Sean,

On 06/23/2016 10:22 PM, Sean Paul wrote:
> On Tue, Jun 14, 2016 at 7:46 AM, Yakir Yang <ykk@...k-chips.com> wrote:
>> The hardware IC designed that VOP must output the RGB10 video format to
>> eDP contoller, and if eDP panel only support RGB8, then eDP contoller
>> should cut down the video data, not via VOP contoller, that's why we need
>> to hardcode the VOP output mode to RGA10 here.
>>
>> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
>> Acked-by: Mark Yao <mark.yao@...k-chips.com>
>> Reviewed-by: Tomasz Figa <tomasz.figa@...omium.com>
>> ---
>> Changes in v3:
>> - Add the reviewed flag from Tomasz.
>>      [https://chromium-review.googlesource.com/#/c/346853/12]
>> - Add the acked flag from Mark.
>>
>> Changes in v2:
>> - new patch in v2
>>
>>   drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 16 +++++-----------
>>   1 file changed, 5 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>> index 95a6f60..2ceb3f9 100644
>> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>> @@ -173,17 +173,11 @@ rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder,
>>          int ret;
>>
>>          /*
>> -        * FIXME(Yakir): driver should configure the CRTC output video
>> -        * mode with the display information which indicated the monitor
>> -        * support colorimetry.
>> -        *
>> -        * But don't know why the CRTC driver seems could only output the
>> -        * RGBaaa rightly. For example, if connect the "innolux,n116bge"
>> -        * eDP screen, EDID would indicated that screen only accepted the
>> -        * 6bpc mode. But if I configure CRTC to RGB666 output, then eDP
>> -        * screen would show a blue picture (RGB888 show a green picture).
>> -        * But if I configure CTRC to RGBaaa, and eDP driver still keep
>> -        * RGB666 input video mode, then screen would works prefect.
>> +        * The hardware IC designed that VOP must output the RGB10 video
>> +        * format to eDP contoller, and if eDP panel only support RGB8,
>> +        * then eDP contoller should cut down the video data, not via VOP
>> +        * contoller, that's why we need to hardcode the VOP output mode
>> +        * to RGA10 here.
> s/contoller/controller/
>

Done,

>>           */
>>
>>          ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
>> --
>> 1.9.1
>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>

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