linux-kernel - [PATCH 5.4 071/215] ARM: at91: pm: add quirk for sam9x60s ulp1

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Message-Id: <20200720152823.590075573@linuxfoundation.org>
Date:   Mon, 20 Jul 2020 17:35:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 071/215] ARM: at91: pm: add quirk for sam9x60s ulp1

From: Claudiu Beznea <claudiu.beznea@...rochip.com>

[ Upstream commit bb1a0e87e1c54cd884e9b92b1cec06b186edc7a0 ]

On SAM9X60 2 nop operations has to be introduced after setting
WAITMODE bit in CKGR_MOR.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Link: https://lore.kernel.org/r/1579522208-19523-9-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/mach-at91/pm_suspend.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index ed57c879d4e17..2591cba61937b 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -268,6 +268,10 @@ ENDPROC(at91_backup_mode)
 	orr	tmp1, tmp1, #AT91_PMC_KEY
 	str	tmp1, [pmc, #AT91_CKGR_MOR]
 
+	/* Quirk for SAM9X60's PMC */
+	nop
+	nop
+
 	wait_mckrdy
 
 	/* Enable the crystal oscillator */
-- 
2.25.1