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Fri, 16 Feb 2024 06:40:43 -0600 From: Rohit Visavalia To: , , , , , , , , , CC: Subject: [PATCH] drm: xlnx: dp: Reset DisplayPort IP Date: Fri, 16 Feb 2024 04:40:43 -0800 Message-ID: <20240216124043.1226713-1-rohit.visavalia@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00001CEA:EE_|PH8PR12MB6987:EE_ X-MS-Office365-Filtering-Correlation-Id: b0e26fbb-2eb2-4325-ec51-08dc2eec7f00 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: mKNu5LbkKaNBUuYYJ/5bLGKPSn8R7DW1Qmh4rig+n+kOG+hoK57nNPNJslXa2RpViCHLYxAAsqympEza5G0ZVG6kc+REUVk4kpZQzvKowCIKKC9N/GesqqXLiTp02qmO3599sXyxcuYhU5wMbqf3Bc/TB+ZWmYFcLYgYwyZBcEc7ZFvAzPfMgbDrdCCVucgnW6KCXRNfh1w89XkCCAifZChK7PHPhV7evVA/C/AFUM+sxYHHUV7zbZn2qDxb7xSOtr02OqK5eWB8tL3UOZgN87Yq6D4Njgmkf4o+rLaCEY/pcph2pyrj79NyxZ0eUdInmdb8YXDUGTdeKVKzwfHNulRlvUJBmuCENupyiBgbJl879OURXh0E+mCmnWQHL/4VwDf7VHLs9TbT5UwAQcY88008ofmXs+c/2QZxvw/tJ2kF9/X282ZGpmugjr+W86BsK38f0aAlSDDhec9GyXQVJLQSESEILinODyFsqPCWufvIho8sQrIcGIbqpxTHhLf4mlw93Z+yF2bq7/EATZF0C36atKhowMYfKjBV+YmujvjrYwxucLdfp/87ATzSldXen8pRla3UnjLuYODKxymWL/ShvLU5NKkejtSyhRnU6cbetCCdzrjKHz7Vs8dBjQxx2EbEsOJbCpC0W310LhaL1SzPS/vylP5ovhzhKYU523U= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(39860400002)(376002)(396003)(136003)(346002)(230922051799003)(36860700004)(451199024)(82310400011)(186009)(1800799012)(64100799003)(46966006)(40470700004)(336012)(426003)(81166007)(356005)(82740400003)(70586007)(7416002)(5660300002)(4744005)(70206006)(8936002)(8676002)(4326008)(44832011)(2906002)(26005)(110136005)(2616005)(316002)(478600001)(1076003)(921011)(86362001)(36756003)(41300700001);DIR:OUT;SFP:1101; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Assert DisplayPort reset signal before deasserting, it is to clear out any registers programmed before booting kernel. Signed-off-by: Rohit Visavalia Reviewed-by: Vishal Sagar Reviewed-by: Laurent Pinchart --- drivers/gpu/drm/xlnx/zynqmp_dp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c index 1846c4971fd8..5a40aa1d4283 100644 --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -1714,6 +1714,10 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub) goto err_free; } + ret = zynqmp_dp_reset(dp, true); + if (ret < 0) + return ret; + ret = zynqmp_dp_reset(dp, false); if (ret < 0) goto err_free;