From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 522A226ED37; Tue, 24 Mar 2026 17:01:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774371664; cv=none; b=XDIbSS7h8jsaZ0wGQb5fJfrDR9tJ1mcLf8G9mHLDOlXFePg+jib8T2QE/lnofv8iphQwPxCJ3qukvQn3QYKhFwjO8fKbmS+h4dHAmR9ju5t5Px6RDRsq64wOajIFWX/o3KQ62PGCesf8efHe1nthylzdBP4+iPvxWLa76NqqR2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774371664; c=relaxed/simple; bh=aDKWI4cKGQKK5hVg6AfnHxki62nohW34+6dDQKvaUzA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=gOd8hE7UsjfxFZRmKHYu37siS+IKjTgXMwLCqzu6XxehrwwIPE8gzP5vf8MwQsJpmKXLkHo9CUdnuuT5sUBL2uMa9QXLciYGAgiVJP7NV6CYNl+WUUc8s1/zMmzF4YpfoRVVz+EX/tXZFqNK3lldN+AKSjTqlQ49LRR6JkEne74= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=QJ6QsE/K; arc=none smtp.client-ip=198.175.65.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="QJ6QsE/K" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1774371662; x=1805907662; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=aDKWI4cKGQKK5hVg6AfnHxki62nohW34+6dDQKvaUzA=; b=QJ6QsE/Kf0vPrsjXJ/dQnbh5tHFprQkYl06i7lluhM0QlwW7EJRxfzH2 xZdCQMRS44/SFFBsXzuv70WzPLUQhn8xoFAmz0UxQ+VChtslI8ImTMdWR tFoO6+o61WNqDMhuhLso6btP9gYCtaPuqV2T40tKsr5egKadJsJT6xl5g g2btoa0QRa0msOPQUTcCJjoc+ky9XljXoodN+CENGwuWVx9smrNnyznBJ IJAApmqj+HlM4ssPeCmwuiwJjexi5KOwKDk68oB5hgJE7AbKYTjTwFqnz uR12UGYwXCgbUgU4l7dIJGWzmWcYdI3FaaTA2uzOtWQDzBsuXztypNHbR w==; X-CSE-ConnectionGUID: ZvPSEm7iS12ptha/C+KBNg== X-CSE-MsgGUID: 1oWepLONTlqfA78l1cUg8Q== X-IronPort-AV: E=McAfee;i="6800,10657,11739"; a="78991856" X-IronPort-AV: E=Sophos;i="6.23,138,1770624000"; d="scan'208";a="78991856" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2026 10:01:00 -0700 X-CSE-ConnectionGUID: b4BAW2/ERUWoQ6r6oZykng== X-CSE-MsgGUID: SL+/tSDtRZahvvTQl/a0tQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,138,1770624000"; d="scan'208";a="254912602" Received: from klitkey1-mobl1.ger.corp.intel.com (HELO localhost) ([10.245.244.220]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2026 10:00:49 -0700 Date: Tue, 24 Mar 2026 19:00:45 +0200 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Nicolas Frattaroli Cc: Harry Wentland , Leo Li , Rodrigo Siqueira , Alex Deucher , Christian =?iso-8859-1?Q?K=F6nig?= , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Sandy Huang , Heiko =?iso-8859-1?Q?St=FCbner?= , Andy Yan , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Dmitry Baryshkov , Sascha Hauer , Rob Herring , Jonathan Corbet , Shuah Khan , kernel@collabora.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-doc@vger.kernel.org, Werner Sembach , Andri Yngvason , Marius Vlad Subject: Re: [PATCH v11 03/22] drm: Add new general DRM property "color format" Message-ID: References: <20260324-color-format-v11-0-605559af4fb4@collabora.com> <20260324-color-format-v11-3-605559af4fb4@collabora.com> 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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260324-color-format-v11-3-605559af4fb4@collabora.com> X-Patchwork-Hint: comment Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs Bertel Jungin Aukio 5, 02600 Espoo, Finland On Tue, Mar 24, 2026 at 05:01:07PM +0100, Nicolas Frattaroli wrote: > +enum drm_connector_color_format { > + /** > + * @DRM_CONNECTOR_COLOR_FORMAT_AUTO: The driver or display protocol > + * helpers should pick a suitable color format. All implementations of a > + * specific display protocol must behave the same way with "AUTO", but > + * different display protocols do not necessarily have the same "AUTO" > + * semantics. > + * > + * For HDMI, "AUTO" picks RGB, but falls back to YCbCr 4:2:0 if the > + * bandwidth required for full-scale RGB is not available, or the mode > + * is YCbCr 4:2:0-only, as long as the mode and output both support > + * YCbCr 4:2:0. > + * > + * For display protocols other than HDMI, the recursive bridge chain > + * format selection picks the first chain of bridge formats that works, > + * as has already been the case before the introduction of the "color > + * format" property. Non-HDMI bridges should therefore either sort their > + * bus output formats by preference, or agree on a unified auto format > + * selection logic that's implemented in a common state helper (like > + * how HDMI does it). > + */ > + DRM_CONNECTOR_COLOR_FORMAT_AUTO = 0, > + > + /** > + * @DRM_CONNECTOR_COLOR_FORMAT_RGB444: RGB output format > + */ > + DRM_CONNECTOR_COLOR_FORMAT_RGB444, > + > + /** > + * @DRM_CONNECTOR_COLOR_FORMAT_YCBCR444: YCbCr 4:4:4 output format (ie. > + * not subsampled) > + */ > + DRM_CONNECTOR_COLOR_FORMAT_YCBCR444, > + > + /** > + * @DRM_CONNECTOR_COLOR_FORMAT_YCBCR422: YCbCr 4:2:2 output format (ie. > + * with horizontal subsampling) > + */ > + DRM_CONNECTOR_COLOR_FORMAT_YCBCR422, > + > + /** > + * @DRM_CONNECTOR_COLOR_FORMAT_YCBCR420: YCbCr 4:2:0 output format (ie. > + * with horizontal and vertical subsampling) > + */ > + DRM_CONNECTOR_COLOR_FORMAT_YCBCR420, Seems like this should document what the quantization range should be for each format. > + > + /** > + * @DRM_CONNECTOR_COLOR_FORMAT_COUNT: Number of valid connector color > + * format values in this enum > + */ > + DRM_CONNECTOR_COLOR_FORMAT_COUNT, > +}; > + > +/** > + * drm_connector_color_format_valid - Validate drm_connector_color_format value > + * @fmt: value to check against all values of &enum drm_connector_color_format > + * > + * Checks whether the passed in value of @fmt is one of the allowable values in > + * &enum drm_connector_color_format. > + * > + * Returns: %true if it's a valid value for the enum, %false otherwise. > + */ > +static inline bool __pure > +drm_connector_color_format_valid(enum drm_connector_color_format fmt) > +{ > + switch (fmt) { > + case DRM_CONNECTOR_COLOR_FORMAT_AUTO: > + case DRM_CONNECTOR_COLOR_FORMAT_RGB444: > + case DRM_CONNECTOR_COLOR_FORMAT_YCBCR444: > + case DRM_CONNECTOR_COLOR_FORMAT_YCBCR422: > + case DRM_CONNECTOR_COLOR_FORMAT_YCBCR420: > + return true; > + default: > + return false; > + } > +} > + > const char * > drm_hdmi_connector_get_output_format_name(enum drm_output_color_format fmt); > > @@ -1129,6 +1217,13 @@ struct drm_connector_state { > */ > enum drm_colorspace colorspace; > > + /** > + * @color_format: State variable for Connector property to request > + * color format change on Sink. This is most commonly used to switch > + * between RGB to YUV and vice-versa. > + */ > + enum drm_connector_color_format color_format; > + > /** > * @writeback_job: Writeback job for writeback connectors > * > @@ -2127,6 +2222,12 @@ struct drm_connector { > */ > struct drm_property *colorspace_property; > > + /** > + * @color_format_property: Connector property to set the suitable > + * color format supported by the sink. > + */ > + struct drm_property *color_format_property; > + > /** > * @path_blob_ptr: > * > @@ -2610,6 +2711,9 @@ bool drm_connector_has_possible_encoder(struct drm_connector *connector, > struct drm_encoder *encoder); > const char *drm_get_colorspace_name(enum drm_colorspace colorspace); > > +int drm_connector_attach_color_format_property(struct drm_connector *connector, > + unsigned long supported_color_formats); > + > /** > * drm_for_each_connector_iter - connector_list iterator macro > * @connector: &struct drm_connector pointer used as cursor > > -- > 2.53.0 -- Ville Syrjälä Intel