[V2] ARM: imx: update the cpu power up timing setting on i.mx6sx

Message ID 1543893119-3716-1-git-send-email-Anson.Huang@nxp.com
State New
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  • [V2] ARM: imx: update the cpu power up timing setting on i.mx6sx
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Commit Message

Anson Huang Dec. 4, 2018, 3:17 a.m.
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(-)

Comments

Shawn Guo Dec. 6, 2018, 1:55 a.m. | #1
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.

Patch

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);