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Tue, 23 Jan 2024 20:54:06 -0600 From: Anatoliy Klymenko To: , , , , , , , , , Subject: [PATCH v3 3/5] drm: xlnx: zynqmp_dpsub: Clear status register ASAP Date: Tue, 23 Jan 2024 18:54:00 -0800 Message-ID: <20240124025402.373620-4-anatoliy.klymenko@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240124025402.373620-1-anatoliy.klymenko@amd.com> References: <20240124025402.373620-1-anatoliy.klymenko@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001CA:EE_|PH0PR12MB7079:EE_ X-MS-Office365-Filtering-Correlation-Id: 93895552-df44-4d6e-d085-08dc1c87bd6c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 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)(396003)(376002)(136003)(346002)(230922051799003)(64100799003)(1800799012)(186009)(451199024)(82310400011)(36840700001)(40470700004)(46966006)(966005)(426003)(36860700001)(82740400003)(356005)(2906002)(86362001)(41300700001)(36756003)(47076005)(81166007)(70586007)(70206006)(110136005)(8936002)(6666004)(316002)(478600001)(5660300002)(2616005)(336012)(8676002)(83380400001)(26005)(1076003)(44832011)(921011)(40480700001)(40460700003)(2101003)(83996005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jan 2024 02:54:10.2705 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 93895552-df44-4d6e-d085-08dc1c87bd6c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001CA.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB7079 Clear status register as soon as we read it. Addressing comments from https://lore.kernel.org/dri-devel/beb551c7-bb7e-4cd0-b166-e9aad90c4620@ideasonboard.com/ Signed-off-by: Anatoliy Klymenko --- drivers/gpu/drm/xlnx/zynqmp_dp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c index d60b7431603f..5a3335e1fffa 100644 --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -1624,6 +1624,8 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data) u32 status, mask; status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS); + /* clear status register as soon as we read it */ + zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status); mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK); if (!(status & ~mask)) return IRQ_NONE; @@ -1634,8 +1636,6 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data) if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK) dev_dbg_ratelimited(dp->dev, "overflow interrupt\n"); - zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status); - if (status & ZYNQMP_DP_INT_VBLANK_START) zynqmp_dpsub_drm_handle_vblank(dp->dpsub); -- 2.25.1