linux-kernel - [PATCH 15/24] ARM: at91: pm: wait for ddr power mode off

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Date:   Wed, 31 Mar 2021 13:58:59 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <ludovic.desroches@...rochip.com>, <robh+dt@...nel.org>,
        <linux@...linux.org.uk>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH 15/24] ARM: at91: pm: wait for ddr power mode off

Wait for DDR power mode off before shutting down the core.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 arch/arm/mach-at91/pm_suspend.S | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index 9c9e08fd8300..7396e18dd7e5 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -980,6 +980,11 @@ ulp_exit:
 	mov	tmp1, #0x1
 	str	tmp1, [r0, #0x10]
 
+	/* Wait for it. */
+1:	ldr	tmp1, [r0, #0x10]
+	tst	tmp1, #0x1
+	beq	1b
+
 	/* Shutdown */
 	ldr	r0, .shdwc
 	mov	tmp1, #0xA5000000
-- 
2.25.1