From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751145AbdAaPSo (ORCPT ); Tue, 31 Jan 2017 10:18:44 -0500 Received: from mga05.intel.com ([192.55.52.43]:51232 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750740AbdAaPSi (ORCPT ); Tue, 31 Jan 2017 10:18:38 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,315,1477983600"; d="scan'208";a="1101185407" Date: Tue, 31 Jan 2017 17:18:28 +0200 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Brian Starkey Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Jani Nikula , Sean Paul , Lionel Landwerlin , Daniel Vetter Subject: Re: [PATCH v2] drm/color: Document CTM eqations Message-ID: <20170131151828.GU31595@intel.com> References: <1485859714-26619-1-git-send-email-brian.starkey@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1485859714-26619-1-git-send-email-brian.starkey@arm.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 31, 2017 at 10:48:34AM +0000, Brian Starkey wrote: > Explicitly state the expected CTM equations in the kerneldoc for the CTM > property, and the form of the matrix on struct drm_color_ctm. > > Cc: Ville Syrjälä > Cc: Lionel Landwerlin > Cc: Daniel Vetter > Signed-off-by: Brian Starkey > --- > drivers/gpu/drm/drm_color_mgmt.c | 13 +++++++++++++ > include/uapi/drm/drm_mode.h | 8 +++++++- > 2 files changed, 20 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c > index 789b4c65cd69..7573ca4b6ea6 100644 > --- a/drivers/gpu/drm/drm_color_mgmt.c > +++ b/drivers/gpu/drm/drm_color_mgmt.c > @@ -62,6 +62,19 @@ > * unit/pass-thru matrix should be used. This is generally the driver > * boot-up state too. > * > + * The output vector is related to the input vector as below: > + * > + * | ``out[0] = matrix[0] * in[0] + matrix[1] * in[1] + matrix[2] * in[2];`` > + * | ``out[1] = matrix[3] * in[0] + matrix[4] * in[1] + matrix[5] * in[2];`` > + * | ``out[2] = matrix[6] * in[0] + matrix[7] * in[1] + matrix[8] * in[2];`` > + * > + * The component order in the input/output vectors is assumed to be > + * { R, G, B }. > + * > + * The color-space of the input vector must not be confused with the > + * color-space implied by a framebuffer pixel format, which may be the same > + * or different. > + * > * “GAMMA_LUT”: > * Blob property to set the gamma lookup table (LUT) mapping pixel data > * after the transformation matrix to data sent to the connector. The > diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h > index ce7efe2e8a5e..3401637caf8e 100644 > --- a/include/uapi/drm/drm_mode.h > +++ b/include/uapi/drm/drm_mode.h > @@ -525,7 +525,13 @@ struct drm_mode_crtc_lut { > }; > > struct drm_color_ctm { > - /* Conversion matrix in S31.32 format. */ > + /* > + * Conversion matrix in S31.32 format, in row-major form: s32.32 is how I'd state that (to match the regular s32 and whatnot types). > + * > + * | matrix[0] matrix[1] matrix[2] | > + * | matrix[3] matrix[4] matrix[5] | > + * | matrix[6] matrix[7] matrix[8] | > + */ > __s64 matrix[9]; > }; > > -- > 1.7.9.5 -- Ville Syrjälä Intel OTC