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Mon, 3 Dec 2018 02:45:09 +0000 Received: from DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::adf8:f49d:deb4:58fd]) by DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::adf8:f49d:deb4:58fd%3]) with mapi id 15.20.1382.020; Mon, 3 Dec 2018 02:45:09 +0000 From: Anson Huang To: "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , Fabio Estevam , "linux@armlinux.org.uk" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" Subject: [PATCH] ARM: imx: update the cpu power up timing setting Thread-Topic: [PATCH] ARM: imx: update the cpu power up timing setting Thread-Index: AQHUirI0UtO9K47MFUWyoWpC6YVNRA== Date: Mon, 3 Dec 2018 02:45:09 +0000 Message-ID: <1543804767-17650-1-git-send-email-Anson.Huang@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: HK0PR01CA0047.apcprd01.prod.exchangelabs.com (2603:1096:203:3e::35) To DB3PR0402MB3916.eurprd04.prod.outlook.com (2603:10a6:8:10::18) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [119.31.174.66] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org The sw2iso count should cover ARM LDO ramp-up time, the MAX ARM LDO ramp-up time may be up to more than 100us on some boards, this patch sets sw2iso to 0xf (~384us) which is the reset value, and it is much more safe to cover different boards, since we have observed that some customer boards failed with current setting of 0x2. Fixes: 05136f0897b5 ("ARM: imx: support arm power off in cpuidle for i.mx6sx") Signed-off-by: Anson Huang --- arch/arm/mach-imx/cpuidle-imx6sx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/mach-imx/cpuidle-imx6sx.c b/arch/arm/mach-imx/cpuidle-imx6sx.c index 243a108..fd0053e 100644 --- a/arch/arm/mach-imx/cpuidle-imx6sx.c +++ b/arch/arm/mach-imx/cpuidle-imx6sx.c @@ -110,7 +110,7 @@ int __init imx6sx_cpuidle_init(void) * except for power up sw2iso which need to be * larger than LDO ramp up time. */ - imx_gpc_set_arm_power_up_timing(2, 1); + imx_gpc_set_arm_power_up_timing(0xf, 1); imx_gpc_set_arm_power_down_timing(1, 1); return cpuidle_register(&imx6sx_cpuidle_driver, NULL); -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel