Commit 3cae7d18 authored Aug 27, 2025 by Nicolas Ferre Committed by Claudiu Beznea Aug 30, 2025

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



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>

parent 296302d3

arch/arm/mach-at91/pm_suspend.S

+7 −1

Original line number	Diff line number	Diff line
		@@ -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: