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Mon, 18 Jan 2021 03:57:52 +0000 From: Jeff LaBundy To: lee.jones@linaro.org Cc: linux-kernel@vger.kernel.org, Jeff LaBundy Subject: [PATCH v2 4/6] mfd: iqs62x: Increase interrupt handler return delay Date: Sun, 17 Jan 2021 21:57:06 -0600 Message-Id: <1610942228-7275-5-git-send-email-jeff@labundy.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1610942228-7275-1-git-send-email-jeff@labundy.com> References: <1610942228-7275-1-git-send-email-jeff@labundy.com> Content-Type: text/plain X-Originating-IP: [136.49.173.128] X-ClientProxiedBy: SN4PR0501CA0055.namprd05.prod.outlook.com (2603:10b6:803:41::32) To SN6PR08MB5517.namprd08.prod.outlook.com (2603:10b6:805:fb::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (136.49.173.128) by SN4PR0501CA0055.namprd05.prod.outlook.com (2603:10b6:803:41::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3784.6 via Frontend Transport; Mon, 18 Jan 2021 03:57:52 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: fc9865e7-8274-4b25-7614-08d8bb653ac0 X-MS-TrafficTypeDiagnostic: SN6PR08MB4878: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4714; 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X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?VFMAiBi8UMKE1HJDkLVroEt5edTE9IMX+8VFAslrrCmmecx6iWJ5b2AUdfO3?= =?us-ascii?Q?CTBCAHOSPWz/d8GLD9JFFSML5yVsWuMrHswnBKAAiiZuBRb6H2qnOo2ahzdn?= =?us-ascii?Q?BlP0llgWDGC/9dbzsWp/hyVBh/L45EYjoiVieXNB1Amn0hWGP5pC4BRjsl6R?= =?us-ascii?Q?UmJNbuVW8IG1WpyP29tRRVUoPqjCA6/xpWoo6Rlibw5DMxAg8nAmZOBh9LhU?= =?us-ascii?Q?qE1YnlwRcDx6GVA93uTuP8BS+KYBDFV0xUZr/JGBMTEg5Gc1FSHwla8HD+sC?= =?us-ascii?Q?RrbK067NbwoAMcsIv8B1fhNhTBIJZR9lu96JJY0zOSfMTkpbWf5IFQr+yAAx?= =?us-ascii?Q?ck6okUKbIVM2+L+Qc2Oiyz98v/Fng8GaAtHd8qADj7uyOFQjM6qQfO34pl81?= =?us-ascii?Q?vIuQEERdEqapmKr2MyeaQIpGnb4MkAbFPMKk9jJECQkcKaEmzu6TE+tBNRHO?= =?us-ascii?Q?6CX1i8b10bjbQ8k3oRD+cCV9e5Hm/MvTHtTzCKR8kEthO2XtMildLhzC3ws+?= =?us-ascii?Q?d/sBM2N4QrE9lauCWleqHZnjP7FivlCX0yFLM46r49a5bE/CTtjYpNRE12Mv?= =?us-ascii?Q?ve+TMFtiTPjlB/Oeg7b26DV4X4oupufbcutoTu3Xpi1/TDGNE255F7VFRgQB?= =?us-ascii?Q?EM4lB8QukKmSVmsR5IIEBQXyt77a9Fb/fDyGjhHahUmj+SMUAfeKXbF5IA4F?= =?us-ascii?Q?T3Egg7Bk0dLPRw0Z3y5H7CdGRRjVN7ME1ab/51YmkRIgQeBltuDgGQI6WyKz?= =?us-ascii?Q?nOySPQUjvccPyzTc/8PgQU3Ow8BUsKIkthDUY9iNdviX7VL/ZFdaH0IT6A96?= =?us-ascii?Q?p7Nx+HZoa6BrCC2XwbKGsv5UVbRml11knmJ98bgDqhliTulUWAQTP1PPlE8a?= =?us-ascii?Q?M7s28sGCaYyHjXvFl0oOP2sGrgdlyLpg71VErHQMDwJp4HHK3dZH64NTGGF1?= =?us-ascii?Q?q1+2iisWAy0mAdbY5QXxLXzJ+JCk/1xdiX7hiOKr6xM/YYQueNcPJ6Hx8eSL?= =?us-ascii?Q?1goF?= X-OriginatorOrg: labundy.com X-MS-Exchange-CrossTenant-Network-Message-Id: fc9865e7-8274-4b25-7614-08d8bb653ac0 X-MS-Exchange-CrossTenant-AuthSource: SN6PR08MB5517.namprd08.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jan 2021 03:57:52.6210 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 00b69d09-acab-4585-aca7-8fb7c6323e6f X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: f899kc7NI6I+Iz5EWcrsc/H8xGEYqh0hdEssfIkS/hEnqq54u1Echz05Flobw5HRFDOVCu1VIc0T4TN1qMS53g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR08MB4878 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The time the device takes to deassert its RDY output following an I2C stop condition scales with the core clock frequency. To prevent level-triggered interrupts from being reasserted after the interrupt handler returns, increase the time before returning to account for the worst-case delay (~90 us) plus margin. Signed-off-by: Jeff LaBundy Acked-for-MFD-by: Lee Jones --- Changes in v2: - Added Acked-for-MFD-by trailer drivers/mfd/iqs62x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mfd/iqs62x.c b/drivers/mfd/iqs62x.c index 7a1ff7c..07c9725 100644 --- a/drivers/mfd/iqs62x.c +++ b/drivers/mfd/iqs62x.c @@ -533,7 +533,7 @@ static irqreturn_t iqs62x_irq(int irq, void *context) * ensure the device's RDY output has been deasserted by the time the * interrupt handler returns. */ - usleep_range(50, 100); + usleep_range(150, 200); return IRQ_HANDLED; } -- 2.7.4