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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 CH1PEPF0000AD7F.mail.protection.outlook.com (10.167.244.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7918.13 via Frontend Transport; Thu, 12 Sep 2024 07:08:42 +0000 Received: from amd.amd.com (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 15.1.2507.39; Thu, 12 Sep 2024 02:08:39 -0500 From: Akshay Gupta To: , CC: , , , , Akshay Gupta Subject: [PATCH v4 3/9] misc: amd-sbi: Optimize the wait condition for mailbox command completion Date: Thu, 12 Sep 2024 07:08:04 +0000 Message-ID: <20240912070810.1644621-4-akshay.gupta@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240912070810.1644621-1-akshay.gupta@amd.com> References: <20240912070810.1644621-1-akshay.gupta@amd.com> Precedence: bulk X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: CH1PEPF0000AD7F:EE_|DS0PR12MB6487:EE_ X-MS-Office365-Filtering-Correlation-Id: 20fbc12a-edc2-46d7-6d2d-08dcd2f9bc39 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|36860700013|1800799024; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Sep 2024 07:08:42.5400 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 20fbc12a-edc2-46d7-6d2d-08dcd2f9bc39 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: CH1PEPF0000AD7F.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB6487 - optimize the wait condition to indicate command completion by replacing the do while loop with regmap subsystem API regmap_read_poll_timeout() Signed-off-by: Akshay Gupta Reviewed-by: Naveen Krishna Chatradhi --- Changes since v3: - New patch as per suggestion from Arnd drivers/misc/amd-sbi/rmi-core.c | 19 ++++--------------- 1 file changed, 4 insertions(+), 15 deletions(-) diff --git a/drivers/misc/amd-sbi/rmi-core.c b/drivers/misc/amd-sbi/rmi-core.c index 5a0b7912cc4e..57f2915ac8d5 100644 --- a/drivers/misc/amd-sbi/rmi-core.c +++ b/drivers/misc/amd-sbi/rmi-core.c @@ -25,7 +25,7 @@ int rmi_mailbox_xfer(struct sbrmi_data *data, struct sbrmi_mailbox_msg *msg) { unsigned int bytes; - int i, ret, retry = 10; + int i, ret; int sw_status; u8 byte; @@ -66,21 +66,10 @@ int rmi_mailbox_xfer(struct sbrmi_data *data, * an ALERT (if enabled) to initiator (BMC) to indicate completion * of the requested command */ - do { - ret = regmap_read(data->regmap, SBRMI_STATUS, &sw_status); - if (sw_status < 0) { - ret = sw_status; - goto exit_unlock; - } - if (sw_status & SW_ALERT_MASK) - break; - usleep_range(50, 100); - } while (retry--); - - if (retry < 0) { - ret = -EIO; + ret = regmap_read_poll_timeout(data->regmap, SBRMI_STATUS, sw_status, + sw_status & SW_ALERT_MASK, 500, 2000000); + if (ret) goto exit_unlock; - } /* * For a read operation, the initiator (BMC) reads the firmware