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Fri, 01 Mar 2024 03:29:44 -0800 (PST) X-Google-Smtp-Source: AGHT+IEKqlwQ+JstuXu5h4wbg4ZOpZ/dkea6nQ1ibG6iOdPso+qOIY2FCKYMPY6GH4tsyMvb9w+yJg== X-Received: by 2002:a05:600c:4fc4:b0:412:c8c9:c844 with SMTP id o4-20020a05600c4fc400b00412c8c9c844mr988453wmq.26.1709292583675; Fri, 01 Mar 2024 03:29:43 -0800 (PST) Received: from toolbox ([2001:9e8:89a0:c500:c65:1f3a:8c08:2a1d]) by smtp.gmail.com with ESMTPSA id bi19-20020a05600c3d9300b00412ca030252sm1036720wmb.30.2024.03.01.03.29.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Mar 2024 03:29:43 -0800 (PST) Date: Fri, 1 Mar 2024 12:29:41 +0100 From: Sebastian Wick To: Maxime Ripard Cc: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Jonathan Corbet , Sandy Huang , Heiko =?iso-8859-1?Q?St=FCbner?= , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Hans Verkuil , Ville =?iso-8859-1?Q?Syrj=E4l=E4?= , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-sunxi@lists.linux.dev, Dave Stevenson Subject: Re: [PATCH v7 21/36] drm/connector: hdmi: Add Broadcast RGB property Message-ID: <20240301112941.GE166694@toolbox> References: <20240222-kms-hdmi-connector-state-v7-0-8f4af575fce2@kernel.org> <20240222-kms-hdmi-connector-state-v7-21-8f4af575fce2@kernel.org> <20240229194726.GB166694@toolbox> <20240301-light-impressive-grasshopper-adabeb@houat> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240301-light-impressive-grasshopper-adabeb@houat> On Fri, Mar 01, 2024 at 11:30:56AM +0100, Maxime Ripard wrote: > On Thu, Feb 29, 2024 at 08:47:26PM +0100, Sebastian Wick wrote: > > > @@ -1708,6 +1731,39 @@ EXPORT_SYMBOL(drm_connector_attach_dp_subconnector_property); > > > /** > > > * DOC: HDMI connector properties > > > * > > > + * Broadcast RGB (HDMI specific) > > > + * Indicates the Quantization Range (Full vs Limited) used. The color > > > + * processing pipeline will be adjusted to match the value of the > > > + * property, and the Infoframes will be generated and sent accordingly. > > > + * > > > + * This property is only relevant if the HDMI output format is RGB. If > > > + * it's one of the YCbCr variant, it will be ignored and the output will > > > + * use a limited quantization range. > > > > Uh, maybe just say that the quantization range is selected automatically > > in case a YCbCr output format is in use. I'm not sure every YCbCr > > variant requires limited and even if it does, new formats could change > > this. > > I documented what i915 is doing: > https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/i915/display/intel_hdmi.c#L2143 Sure, this is one valid strategy for the automatic behavior of YCbCr. Drivers could also always send an InfoFrame to ensure full range where possible. The point here is that this property shall not affect YCbCr output formats! Maybe it's even better to say "driver specific" instead of "automatic". > Maxime >