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Thu, 21 Sep 2023 09:15:09 +0000 From: Xin Ji To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter Subject: [PATCH] drm/bridge: Add 200ms delay to wait FW HPD status stable Date: Thu, 21 Sep 2023 17:14:35 +0800 Message-Id: <20230921091435.3524869-1-xji@analogixsemi.com> X-Mailer: git-send-email 2.25.1 X-ClientProxiedBy: SG3P274CA0016.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:be::28) To BY5PR04MB6739.namprd04.prod.outlook.com (2603:10b6:a03:229::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY5PR04MB6739:EE_|SA0PR04MB7274:EE_ X-MS-Office365-Filtering-Correlation-Id: f0bdbfe1-7368-473c-4328-08dbba83407c 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:255.255.255.255; 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Signed-off-by: Xin Ji --- drivers/gpu/drm/bridge/analogix/anx7625.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index 51abe42c639e..833d6d50a03d 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.c +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c @@ -1464,6 +1464,9 @@ static int _anx7625_hpd_polling(struct anx7625_data *ctx, if (ctx->pdata.intp_irq) return 0; + /* Delay 200ms for FW HPD de-bounce */ + usleep_range(200000, 201000); + ret = readx_poll_timeout(anx7625_read_hpd_status_p0, ctx, val, ((val & HPD_STATUS) || (val < 0)),