From patchwork Mon Mar 7 20:52:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 12772370 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 505E4C433F5 for ; Mon, 7 Mar 2022 20:53:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7B60B10E268; Mon, 7 Mar 2022 20:53:43 +0000 (UTC) Received: from baptiste.telenet-ops.be (baptiste.telenet-ops.be [IPv6:2a02:1800:120:4::f00:13]) by gabe.freedesktop.org (Postfix) with ESMTPS id BD57010E24E for ; Mon, 7 Mar 2022 20:53:35 +0000 (UTC) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed40:6100:2d37:4115:c358]) by baptiste.telenet-ops.be with bizsmtp id 3YtW2700A1Yj8bA01YtWpf; Mon, 07 Mar 2022 21:53:33 +0100 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1nRKLY-0036Qk-NS; Mon, 07 Mar 2022 21:52:48 +0100 Received: from geert by rox.of.borg with local (Exim 4.93) (envelope-from ) id 1nRKLY-0034i2-2N; Mon, 07 Mar 2022 21:52:48 +0100 From: Geert Uytterhoeven To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Javier Martinez Canillas , Sam Ravnborg , Helge Deller Subject: [PATCH v2 RFC 08/10] drm/fourcc: Document that single-channel "red" can be any color Date: Mon, 7 Mar 2022 21:52:43 +0100 Message-Id: <585dc03acb4016bba910e7d15fec3ef4f0aec5b0.1646683502.git.geert@linux-m68k.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fbdev@vger.kernel.org, Geert Uytterhoeven , linux-m68k@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Traditionally, the first channel has been called the "red" channel, but the fourcc values for single-channel "red" formats can also be used for other light-on-dark displays, like grayscale. Signed-off-by: Geert Uytterhoeven Reviewed-by: Javier Martinez Canillas --- RFC, as I have no immediate need for these formats. v2: - New. --- include/uapi/drm/drm_fourcc.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index 457ed39cc48f08e1..f0187cf20e4619d2 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -104,16 +104,16 @@ extern "C" { #define DRM_FORMAT_C4 fourcc_code('C', '4', ' ', ' ') /* [7:0] C0:C1 4:4 two pixels/byte */ #define DRM_FORMAT_C8 fourcc_code('C', '8', ' ', ' ') /* [7:0] C 8 one pixel/byte */ -/* 8 bpp Red */ +/* 8 bpp Red (or generic light-on-dark) */ #define DRM_FORMAT_R8 fourcc_code('R', '8', ' ', ' ') /* [7:0] R */ -/* 10 bpp Red */ +/* 10 bpp Red (or generic light-on-dark) */ #define DRM_FORMAT_R10 fourcc_code('R', '1', '0', ' ') /* [15:0] x:R 6:10 little endian */ -/* 12 bpp Red */ +/* 12 bpp Red (or generic light-on-dark) */ #define DRM_FORMAT_R12 fourcc_code('R', '1', '2', ' ') /* [15:0] x:R 4:12 little endian */ -/* 16 bpp Red */ +/* 16 bpp Red (or generic light-on-dark) */ #define DRM_FORMAT_R16 fourcc_code('R', '1', '6', ' ') /* [15:0] R little endian */ /* 16 bpp RG */