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ARM: at91: pm: save and restore ACR during PLL disable/enable

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Add a new word in assembly to store ACR value during the calls
to at91_plla_disable/at91_plla_enable macros and use it.

Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
[cristian.birsan@microchip.com: remove ACR_DEFAULT_PLLA loading]
Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Link: https://lore.kernel.org/r/20250827145427.46819-4-nicolas.ferre@microchip.com
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
This commit is contained in:
Nicolas Ferre
2025-08-27 16:54:27 +02:00
parent 8f5ae30d69
commit 0c01fe4965
1 changed files with 7 additions and 1 deletions
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8
arch/arm/mach-at91/pm_suspend.S
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@@ -689,6 +689,10 @@ sr_dis_exit:
bic tmp2, tmp2, #AT91_PMC_PLL_UPDT_ID
str tmp2, [pmc, #AT91_PMC_PLL_UPDT]
/* save acr */
ldr tmp2, [pmc, #AT91_PMC_PLL_ACR]
str tmp2, .saved_acr
/* save div. */
mov tmp1, #0
ldr tmp2, [pmc, #AT91_PMC_PLL_CTRL0]
@@ -758,7 +762,7 @@ sr_dis_exit:
str tmp1, [pmc, #AT91_PMC_PLL_UPDT]
/* step 2. */
ldr tmp1, =AT91_PMC_PLL_ACR_DEFAULT_PLLA
ldr tmp1, .saved_acr
str tmp1, [pmc, #AT91_PMC_PLL_ACR]
/* step 3. */
@@ -1207,6 +1211,8 @@ ENDPROC(at91_pm_suspend_in_sram)
#endif
.saved_mckr:
.word 0
.saved_acr:
.word 0
.saved_pllar:
.word 0
.saved_sam9_lpr: