From patchwork Thu Oct 5 17:15:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Melissa Wen X-Patchwork-Id: 13410482 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 3415BE9271C for ; Thu, 5 Oct 2023 17:16:32 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E230910E44C; Thu, 5 Oct 2023 17:16:05 +0000 (UTC) Received: from fanzine2.igalia.com (fanzine.igalia.com [178.60.130.6]) by gabe.freedesktop.org (Postfix) with ESMTPS id 08D5610E44A; Thu, 5 Oct 2023 17:16:01 +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=KMZ0VPbyWKy1uQikSMAICTS4q3jD5MJhTncQ3l2fqRw=; b=p7pUs9wFt2sOOUcsGhBwW+eRbo jcxDUq4pMnKrkVBWF4oJz27Ww7NaaeK7sWWFh4oOXuan1gr3UwwosJSo/iHABarfeXziCmR1DZwA0 azAysI5NWqR4B251rOeYzbAco8kWUHrc+WwH/x9SLZiwnH2ao6OQpx7PWo912AeTeB7KK5MPCLx8n qninq6cg3RWXlZtrbjycs1QdGahUS4QGwttnf0kxtAAgylRgMDgj+39mQNoL//Q6C8YcMgfe357id CJUT6efYdt8aWNsxaJTkdWyC6CXzU04RK/vRNyNMcjA39l5F9zAKNZHpkgSpkNduJBcLht5Nuic+P 1YgXGS3Q==; Received: from [102.213.205.115] (helo=killbill.home) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1qoRx8-00CFJN-Q5; Thu, 05 Oct 2023 19:15:58 +0200 From: Melissa Wen To: amd-gfx@lists.freedesktop.org, Harry Wentland , Rodrigo Siqueira , sunpeng.li@amd.com, Alex Deucher , dri-devel@lists.freedesktop.org, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch Subject: [PATCH v4 13/32] drm/amd/display: add comments to describe DM crtc color mgmt behavior Date: Thu, 5 Oct 2023 16:15:08 -0100 Message-Id: <20231005171527.203657-14-mwen@igalia.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231005171527.203657-1-mwen@igalia.com> References: <20231005171527.203657-1-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: Sebastian Wick , Pekka Paalanen , Shashank Sharma , Alex Hung , Xaver Hugl , kernel-dev@igalia.com, Nicholas Kazlauskas , 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. Reviewed-by: Harry Wentland Signed-off-by: Melissa Wen --- .../drm/amd/display/amdgpu_dm/amdgpu_dm_color.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) 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 2ecfa0e886e8..2b2826a1d855 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 @@ -660,13 +660,25 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc) crtc->cm_is_degamma_srgb = true; stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS; stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB; - + /* + * Note: although 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: there is no implicit sRGB regamma here. 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;