* [PATCH V2] ARM: imx: update the cpu power up timing setting on i.mx6sx
@ 2018-12-04 3:17 Anson Huang
2018-12-06 1:55 ` Shawn Guo
0 siblings, 1 reply; 2+ messages in thread
From: Anson Huang @ 2018-12-04 3:17 UTC (permalink / raw)
To: shawnguo, s.hauer, kernel, Fabio Estevam, linux,
linux-arm-kernel, linux-kernel
Cc: dl-linux-imx
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>
Reviewed-by: Fabio Estevam <festevam@gmail.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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH V2] ARM: imx: update the cpu power up timing setting on i.mx6sx
2018-12-04 3:17 [PATCH V2] ARM: imx: update the cpu power up timing setting on i.mx6sx Anson Huang
@ 2018-12-06 1:55 ` Shawn Guo
0 siblings, 0 replies; 2+ messages in thread
From: Shawn Guo @ 2018-12-06 1:55 UTC (permalink / raw)
To: Anson Huang
Cc: s.hauer, kernel, Fabio Estevam, linux, linux-arm-kernel,
linux-kernel, dl-linux-imx
On Tue, Dec 04, 2018 at 03:17:45AM +0000, Anson Huang wrote:
> 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>
> Reviewed-by: Fabio Estevam <festevam@gmail.com>
Applied, thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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