[RFC] power: imx8m-power-domain: Add delay to align with kernel driver
Fabio Estevam
festevam at gmail.com
Fri Apr 28 21:52:49 CEST 2023
From: Fabio Estevam <festevam at denx.de>
In the imx8m power domain kernel driver, there is an extra udelay(5)
prior to requesting the domain to power up:
https://github.com/torvalds/linux/blob/v6.3/drivers/soc/imx/gpcv2.c#L347-L375
Haven't observed any issues due to the lack of this delay
in U-Boot, but better to align it with the driver implementation.
Signed-off-by: Fabio Estevam <festevam at denx.de>
---
Marking it as RFC for now, to try to get some feedback first.
Thanks
drivers/power/domain/imx8m-power-domain.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/power/domain/imx8m-power-domain.c b/drivers/power/domain/imx8m-power-domain.c
index 145f6ec0cd32..df5d7d695621 100644
--- a/drivers/power/domain/imx8m-power-domain.c
+++ b/drivers/power/domain/imx8m-power-domain.c
@@ -338,6 +338,9 @@ static int imx8m_power_domain_on(struct power_domain *power_domain)
}
}
+ /* delay for reset to propagate */
+ udelay(5);
+
if (domain->bits.pxx) {
/* request the domain to power up */
setbits_le32(base + regs->pup, domain->bits.pxx);
--
2.34.1
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