From patchwork Wed Apr 6 08:48:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sandor Yu X-Patchwork-Id: 12802711 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 8AFA5C433F5 for ; Wed, 6 Apr 2022 08:47:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6A29110E55F; Wed, 6 Apr 2022 08:47:46 +0000 (UTC) Received: from inva020.nxp.com (inva020.nxp.com [92.121.34.13]) by gabe.freedesktop.org (Postfix) with ESMTPS id B2A0810E32E for ; Wed, 6 Apr 2022 08:47:45 +0000 (UTC) Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 4B3F11A13A5; Wed, 6 Apr 2022 10:40:15 +0200 (CEST) Received: from aprdc01srsp001v.ap-rdc01.nxp.com (aprdc01srsp001v.ap-rdc01.nxp.com [165.114.16.16]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 00A8E1A129E; Wed, 6 Apr 2022 10:40:15 +0200 (CEST) Received: from localhost.localdomain (mega.ap.freescale.net [10.192.208.232]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id CE566183AC4F; Wed, 6 Apr 2022 16:40:12 +0800 (+08) From: Sandor.yu@nxp.com To: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, andrzej.hajda@intel.com, narmstrong@baylibre.com, robert.foss@linaro.org, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@gmail.com Subject: [PATCH v1 3/5] drm: bridge: dw_hdmi: Enable GCP only for Deep Color Date: Wed, 6 Apr 2022 16:48:35 +0800 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-Virus-Scanned: ClamAV using ClamSMTP 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: Sandor.yu@nxp.com, shengjiu.wang@nxp.com, amuel@sholland.org, cai.huoqing@linux.dev, maxime@cerno.tech, hverkuil-cisco@xs4all.nl Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Sandor Yu HDMI1.4b specification section 6.5.3: Source shall only send GCPs with non-zero CD to sinks that indicate support for Deep Color. DW HDMI GPC default enabled, clear gpc_auto bit for bpp 24. Signed-off-by: Sandor Yu --- drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index b11577de4836..c7b11582529e 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -1160,6 +1160,14 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi) HDMI_VP_PR_CD_DESIRED_PR_FACTOR_MASK); hdmi_writeb(hdmi, val, HDMI_VP_PR_CD); + val = hdmi_readb(hdmi, HDMI_FC_DATAUTO3); + if (color_depth == 4) + /* disable Auto GCP when bpp 24 */ + val &= ~0x4; + else + val |= 0x4; + hdmi_writeb(hdmi, val, HDMI_FC_DATAUTO3); + hdmi_modb(hdmi, HDMI_VP_STUFF_PR_STUFFING_STUFFING_MODE, HDMI_VP_STUFF_PR_STUFFING_MASK, HDMI_VP_STUFF);