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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CO1NAM11FT010.mail.protection.outlook.com (10.13.175.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6411.21 via Frontend Transport; Fri, 19 May 2023 10:32:49 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Fri, 19 May 2023 05:32:46 -0500 From: Nava kishore Manne To: , , , , , , , CC: Alfonso Rodriguez Subject: [PATCH] fpga: zynq-fpga: Ensure proper xCAP interface switch Date: Fri, 19 May 2023 16:02:32 +0530 Message-ID: <20230519103232.3009096-1-nava.kishore.manne@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT010:EE_|SA3PR12MB9177:EE_ X-MS-Office365-Filtering-Correlation-Id: e7499261-05d0-427c-9275-08db585464ad X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 May 2023 10:32:49.1088 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e7499261-05d0-427c-9275-08db585464ad 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: CO1NAM11FT010.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB9177 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org From: Alfonso Rodriguez Ensure that the low-level fpga-manager driver for Zynq-7000 devices switches between reconfiguration interfaces as specified in the TRM (section 6.5.1: "Ensure that all outstanding transactions are completed before changing interfaces"); device (re)configuration may fail otherwise Signed-off-by: Alfonso Rodriguez Tested-by: Nava kishore Manne --- drivers/fpga/zynq-fpga.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c index ae0da361e6c6..88db9ac36887 100644 --- a/drivers/fpga/zynq-fpga.c +++ b/drivers/fpga/zynq-fpga.c @@ -493,15 +493,16 @@ static int zynq_fpga_ops_write_complete(struct fpga_manager *mgr, if (err) return err; - /* Release 'PR' control back to the ICAP */ - zynq_fpga_write(priv, CTRL_OFFSET, - zynq_fpga_read(priv, CTRL_OFFSET) & ~CTRL_PCAP_PR_MASK); - err = zynq_fpga_poll_timeout(priv, INT_STS_OFFSET, intr_status, intr_status & IXR_PCFG_DONE_MASK, INIT_POLL_DELAY, INIT_POLL_TIMEOUT); + /* Release 'PR' control back to the ICAP */ + zynq_fpga_write(priv, CTRL_OFFSET, + zynq_fpga_read(priv, CTRL_OFFSET) + & ~CTRL_PCAP_PR_MASK); + clk_disable(priv->clk); if (err) -- 2.25.1