From patchwork Mon Jan 9 14:38:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Melissa Wen X-Patchwork-Id: 13093664 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 B7B7DC677F1 for ; Mon, 9 Jan 2023 14:44:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 404AD10E433; Mon, 9 Jan 2023 14:44:26 +0000 (UTC) Received: from fanzine2.igalia.com (fanzine2.igalia.com [213.97.179.56]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4464310E431; Mon, 9 Jan 2023 14:44:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=yZ+XADzHjwvGta78ZXBVQh4OGwv1Wat6G9lgsepYSyM=; b=A/BXeZXWL4HuH8i/jEvBcxdnAv ZDsm7EoqvVho9tRzSvxMx5l4aPf22MNse6N3kGsUoap3ZhaioKJwEu3AabOZ0SCuQyzQGjymoJIxn dFdeJ+/UaZT78/RRF8hzAL1vgoSkiPYc5W4WBtxJoxrYZiRDqvs5IYjuvy9m3P20Om7NgHGfBXYoj onOeJwyXdUwGEwix+YsVHbjprxp2c85esOC/K8ZvQLYJfkACHj/FfyRZRJaFyZxT5djIDBXBWjRqu V5K9X5grXuwBaSqY27q01RexqFEuzv9eQLEUnWCmEAvOZgoZ3vLyR5UG1fFFg247+d0p1ghdRQOQg djDdGOsA==; Received: from [41.74.137.107] (helo=killbill.home) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1pEtNh-003TyM-5k; Mon, 09 Jan 2023 15:44:09 +0100 From: Melissa Wen To: harry.wentland@amd.com, sunpeng.li@amd.com, Rodrigo.Siqueira@amd.com, alexander.deucher@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch Subject: [RFC PATCH v2 08/18] drm/amd/display: add comments to describe DM crtc color mgmt behavior Date: Mon, 9 Jan 2023 13:38:36 -0100 Message-Id: <20230109143846.1966301-9-mwen@igalia.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230109143846.1966301-1-mwen@igalia.com> References: <20230109143846.1966301-1-mwen@igalia.com> 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: laurent.pinchart+renesas@ideasonboard.com, kernel-dev@igalia.com, Shashank Sharma , alex.hung@amd.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Melissa Wen , seanpaul@chromium.org, tzimmermann@suse.de, amd-gfx@lists.freedesktop.org, bhawanpreet.lakha@amd.com, nicholas.kazlauskas@amd.com, Joshua Ashton , sungjoon.kim@amd.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Describe some expected behavior of the AMD DM color mgmt programming. Signed-off-by: Melissa Wen --- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c index 10a29d131424..b54ef1392895 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c @@ -428,12 +428,23 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc) stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS; stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB; + /* Note: even if we pass has_rom as parameter here, we never + * actually use ROM because the color module only takes the ROM + * path if transfer_func->type == PREDEFINED. + * + * See more in mod_color_calculate_regamma_params() + */ r = __set_legacy_tf(stream->out_transfer_func, regamma_lut, regamma_size, has_rom); if (r) return r; } else if (has_regamma) { - /* If atomic regamma, CRTC RGM goes into RGM LUT. */ + /* CRTC RGM goes into RGM LUT. + * + * Note: here there is no implicit sRGB regamma. We are using + * degamma calculation from color module to calculate the curve + * from a linear base. + */ stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS; stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;