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ARM: at91: pm: fix MCKx restore routine

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[ Upstream commit 296302d3d81360e09fa956e9be9edc8223b69a12 ]

The at91_mckx_ps_restore() assembly function is responsible for setting
back MCKx system bus clocks after exiting low power modes.

Fix a typo and use tmp3 variable instead of tmp2 to correctly set MCKx
to previously saved state.
Tmp2 was used without the needed changes in CSS and DIV. Moreover the
required bit 7, telling that MCR register's content is to be changed
(CMD/write), was not set.

Fix function comment to match tmp variables actually used.

Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Fixes: 28eb1d40fe ("ARM: at91: pm: add support for MCK1..4 save/restore for ulp modes")
Link: https://lore.kernel.org/r/20250827145427.46819-3-nicolas.ferre@microchip.com
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
[claudiu.beznea: s/sate/state in commit description]
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nicolas Ferre 2025-08-27 16:54:26 +02:00 committed by Greg Kroah-Hartman
parent 6e7dadc576
commit 6094b4fd63
1 changed files with 2 additions and 2 deletions
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4
arch/arm/mach-at91/pm_suspend.S
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@ -868,7 +868,7 @@ e_done:
/**
* at91_mckx_ps_restore: restore MCK1..4 settings
*
* Side effects: overwrites tmp1, tmp2
* Side effects: overwrites tmp1, tmp2 and tmp3
*/
.macro at91_mckx_ps_restore
#ifdef CONFIG_SOC_SAMA7
@ -912,7 +912,7 @@ r_ps:
bic tmp3, tmp3, #AT91_PMC_MCR_V2_ID_MSK
orr tmp3, tmp3, tmp1
orr tmp3, tmp3, #AT91_PMC_MCR_V2_CMD
str tmp2, [pmc, #AT91_PMC_MCR_V2]
str tmp3, [pmc, #AT91_PMC_MCR_V2]
wait_mckrdy tmp1