From: Anson Huang <anson.huang@nxp.com>
To: "shawnguo@kernel.org" <shawnguo@kernel.org>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
Fabio Estevam <fabio.estevam@nxp.com>,
"linux@armlinux.org.uk" <linux@armlinux.org.uk>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: dl-linux-imx <linux-imx@nxp.com>
Subject: [PATCH] ARM: imx: update the cpu power up timing setting
Date: Mon, 3 Dec 2018 02:45:09 +0000 [thread overview]
Message-ID: <1543804767-17650-1-git-send-email-Anson.Huang@nxp.com> (raw)
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 <Anson.Huang@nxp.com>
---
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
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next reply other threads:[~2018-12-03 2:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-03 2:45 Anson Huang [this message]
2018-12-03 11:42 ` [PATCH] ARM: imx: update the cpu power up timing setting Fabio Estevam
2018-12-03 12:03 ` Fabio Estevam
2018-12-04 3:18 ` Anson Huang
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