linux-kernel - Re: [PATCH 04/11] drm/rockchip: inno_hdmi: Correctly setup HDMI quantization range

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Message-ID: <qr7if2k76wdqgevdcwqxj2dkcbga72owjqlk3qaazujhejjloo@cnvmuq27qqns>
Date:   Thu, 14 Dec 2023 12:36:05 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     Alex Bee <knaerzche@...il.com>, Sandy Huang <hjc@...k-chips.com>,
        Andy Yan <andyshrk@....com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/11] drm/rockchip: inno_hdmi: Correctly setup HDMI
 quantization range

On Thu, Dec 14, 2023 at 12:17:34PM +0100, Heiko Stübner wrote:
> Am Donnerstag, 14. Dezember 2023, 12:12:08 CET schrieb Alex Bee:
> > Hi Maxime
> > 
> > Am 14.12.23 um 08:56 schrieb Maxime Ripard:
> > > Hi Alex,
> > >
> > > Thanks for working on this!
> > >
> > > On Wed, Dec 13, 2023 at 08:51:18PM +0100, Alex Bee wrote:
> > >> The display controller will always give full range RGB regardless of the
> > >> mode set, but HDMI requires certain modes to be transmitted in limited
> > >> range RGB. This is especially required for HDMI sinks which do not support
> > >> non-standard quantization ranges.
> > >>
> > >> This enables color space conversion for those modes and sets the
> > >> quantization range accordingly in the AVI infoframe.
> > >>
> > >> Fixes: 412d4ae6b7a5 ("drm/rockchip: hdmi: add Innosilicon HDMI support")
> > >> Signed-off-by: Alex Bee <knaerzche@...il.com>
> > >> ---
> > >>   drivers/gpu/drm/rockchip/inno_hdmi.c | 40 ++++++++++++++++++++++------
> > >>   1 file changed, 32 insertions(+), 8 deletions(-)
> > >>
> > >> diff --git a/drivers/gpu/drm/rockchip/inno_hdmi.c b/drivers/gpu/drm/rockchip/inno_hdmi.c
> > >> index 345253e033c5..32626a75723c 100644
> > >> --- a/drivers/gpu/drm/rockchip/inno_hdmi.c
> > >> +++ b/drivers/gpu/drm/rockchip/inno_hdmi.c
> > >> @@ -33,6 +33,7 @@ struct hdmi_data_info {
> > >>   	unsigned int enc_in_format;
> > >>   	unsigned int enc_out_format;
> > >>   	unsigned int colorimetry;
> > >> +	bool rgb_limited_range;
> > >>   };
> > >>   
> > >>   struct inno_hdmi_i2c {
> > >> @@ -308,6 +309,18 @@ static int inno_hdmi_config_video_avi(struct inno_hdmi *hdmi,
> > >>   	else
> > >>   		frame.avi.colorspace = HDMI_COLORSPACE_RGB;
> > >>   
> > >> +	if (hdmi->hdmi_data.enc_out_format == HDMI_COLORSPACE_RGB) {
> > >> +		drm_hdmi_avi_infoframe_quant_range(&frame.avi,
> > >> +						   &hdmi->connector, mode,
> > >> +						   hdmi->hdmi_data.rgb_limited_range ?
> > >> +						   HDMI_QUANTIZATION_RANGE_LIMITED :
> > >> +						   HDMI_QUANTIZATION_RANGE_FULL);
> > >> +	} else {
> > >> +		frame.avi.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
> > >> +		frame.avi.ycc_quantization_range =
> > >> +			HDMI_YCC_QUANTIZATION_RANGE_LIMITED;
> > >> +	}
> > >> +
> > >>   	return inno_hdmi_upload_frame(hdmi, rc, &frame, INFOFRAME_AVI, 0, 0, 0);
> > >>   }
> > >>   
> > >> @@ -334,14 +347,22 @@ static int inno_hdmi_config_video_csc(struct inno_hdmi *hdmi)
> > >>   	if (data->enc_in_format == data->enc_out_format) {
> > >>   		if ((data->enc_in_format == HDMI_COLORSPACE_RGB) ||
> > >>   		    (data->enc_in_format >= HDMI_COLORSPACE_YUV444)) {
> > >> -			value = v_SOF_DISABLE | v_COLOR_DEPTH_NOT_INDICATED(1);
> > >> -			hdmi_writeb(hdmi, HDMI_VIDEO_CONTRL3, value);
> > >> -
> > >> -			hdmi_modb(hdmi, HDMI_VIDEO_CONTRL,
> > >> -				  m_VIDEO_AUTO_CSC | m_VIDEO_C0_C2_SWAP,
> > >> -				  v_VIDEO_AUTO_CSC(AUTO_CSC_DISABLE) |
> > >> -				  v_VIDEO_C0_C2_SWAP(C0_C2_CHANGE_DISABLE));
> > >> -			return 0;
> > >> +			if (data->enc_in_format == HDMI_COLORSPACE_RGB &&
> > >> +			    data->enc_out_format == HDMI_COLORSPACE_RGB &&
> > >> +			    hdmi->hdmi_data.rgb_limited_range) {
> > >> +				csc_mode = CSC_RGB_0_255_TO_RGB_16_235_8BIT;
> > >> +				auto_csc = AUTO_CSC_DISABLE;
> > >> +				c0_c2_change = C0_C2_CHANGE_DISABLE;
> > >> +				csc_enable = v_CSC_ENABLE;
> > >> +			} else {
> > >> +				value = v_SOF_DISABLE | v_COLOR_DEPTH_NOT_INDICATED(1);
> > >> +				hdmi_writeb(hdmi, HDMI_VIDEO_CONTRL3, value);
> > >> +				hdmi_modb(hdmi, HDMI_VIDEO_CONTRL,
> > >> +					  m_VIDEO_AUTO_CSC | m_VIDEO_C0_C2_SWAP,
> > >> +					  v_VIDEO_AUTO_CSC(AUTO_CSC_DISABLE) |
> > >> +					  v_VIDEO_C0_C2_SWAP(C0_C2_CHANGE_DISABLE));
> > >> +				return 0;
> > >> +			}
> > >>   		}
> > >>   	}
> > >>   
> > >> @@ -458,6 +479,9 @@ static int inno_hdmi_setup(struct inno_hdmi *hdmi,
> > >>   	else
> > >>   		hdmi->hdmi_data.colorimetry = HDMI_COLORIMETRY_ITU_709;
> > >>   
> > >> +	hdmi->hdmi_data.rgb_limited_range =
> > >> +		drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_LIMITED;
> > >> +
> > > This patch conflicts heavily with my inno_hdmi patches here (patches 22 to 38):
> > > https://lore.kernel.org/dri-devel/20231207-kms-hdmi-connector-state-v5-0-6538e19d634d@kernel.org/
> > I'm aware of that and I mentioned it in the cover letter. Your series is 
> > not merged yet and it didn't get much feedback so far. What is the 
> > status there? Especially because you are removing things from inno-hdmi 
> > driver (which aren't really required to remove there) which will I have 
> > to reintroduce.
> 
> Sadly I haven't found the time to look closer at Maxime's series so far,
> but I got the impression that it separates into multiple cleanup steps
> for a number of controllers.

Yeah, one of the previous version comment was to support more
controllers than vc4, which is fair. So I ended up reworking and
converting multiple controllers, but most of the clean up changes can be
applied outside of that series just fine.

I just didn't find someone to test / review them yet :)

Maxime

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