From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFF6DC43441 for ; Fri, 23 Nov 2018 09:28:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7E0DE20820 for ; Fri, 23 Nov 2018 09:28:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7E0DE20820 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408955AbeKWUK3 (ORCPT ); Fri, 23 Nov 2018 15:10:29 -0500 Received: from mail.bootlin.com ([62.4.15.54]:49412 "EHLO mail.bootlin.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2502722AbeKWUK1 (ORCPT ); Fri, 23 Nov 2018 15:10:27 -0500 Received: by mail.bootlin.com (Postfix, from userid 110) id 5D23820DF0; Fri, 23 Nov 2018 10:26:58 +0100 (CET) Received: from localhost.localdomain (aaubervilliers-681-1-94-205.w90-88.abo.wanadoo.fr [90.88.35.205]) by mail.bootlin.com (Postfix) with ESMTPSA id 7659720DF9; Fri, 23 Nov 2018 10:26:33 +0100 (CET) From: Paul Kocialkowski To: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org Cc: Maarten Lankhorst , Maxime Ripard , Sean Paul , David Airlie , Chen-Yu Tsai , Thomas Petazzoni , linux-sunxi@googlegroups.com, Daniel Vetter , Paul Kocialkowski Subject: [PATCH v2 23/43] drm/sun4i: backend: Detail the YUV to RGB values coding explanation Date: Fri, 23 Nov 2018 10:24:55 +0100 Message-Id: <20181123092515.2511-24-paul.kocialkowski@bootlin.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181123092515.2511-1-paul.kocialkowski@bootlin.com> References: <20181123092515.2511-1-paul.kocialkowski@bootlin.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Paul Kocialkowski The values in the BT601 YUV to RGB colorspace translation are not simply coded as multiples, but rather as fixed-point signed fractional values on a given number of bits. Add an explanation about that. Signed-off-by: Paul Kocialkowski --- drivers/gpu/drm/sun4i/sun4i_backend.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c index a39d8b75d76a..986bdb64521c 100644 --- a/drivers/gpu/drm/sun4i/sun4i_backend.c +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c @@ -48,8 +48,12 @@ static const u32 sunxi_rgb2yuv_coef[12] = { /* * These coefficients are taken from the A33 BSP from Allwinner. * - * The formula is for each component, each coefficient being multiplied by - * 1024 and each constant being multiplied by 16: + * The first three values of each row are coded as 13-bit signed fixed-point + * numbers, with 10 bits for the fractional part. The fourth value is a + * constant coded as a 14-bit signed fixed-point number with 4 bits for the + * fractional part. + * + * The values in table order give the following colorspace translation: * G = 1.164 * Y - 0.391 * U - 0.813 * V + 135 * R = 1.164 * Y + 1.596 * V - 222 * B = 1.164 * Y + 2.018 * U + 276 -- 2.19.1