linux-kernel - [PATCH] ARM: at91: fix rtc irq mask for sam9x5 SoCs

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Message-Id: <1399479649-3247-1-git-send-email-boris.brezillon@free-electrons.com>
Date:	Wed,  7 May 2014 18:20:49 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Bryan Evenson <bevenson@...inkcorp.com>
Cc:	Andrew Victor <linux@...im.org.za>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Subject: [PATCH] ARM: at91: fix rtc irq mask for sam9x5 SoCs

The RTC IMR register is not reliable on sam9x5 SoCs, hence why me have to
mask all interrupts no matter what IMR claims about already masked irqs.

Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
Reported-by: Bryan Evenson <bevenson@...inkcorp.com>
---
Hello Bryan,

Yet another patch for you ;-).

As usual, could you tell me if it fixes your bug.

BTW, thanks for your tests.

Best Regards,

Boris

 arch/arm/mach-at91/sysirq_mask.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/arch/arm/mach-at91/sysirq_mask.c b/arch/arm/mach-at91/sysirq_mask.c
index 2ba694f..eb3d2a5 100644
--- a/arch/arm/mach-at91/sysirq_mask.c
+++ b/arch/arm/mach-at91/sysirq_mask.c
@@ -37,12 +37,7 @@ void __init at91_sysirq_mask_rtc(u32 rtc_base)
 	if (!base)
 		return;
 
-	mask = readl_relaxed(base + AT91_RTC_IMR);
-	if (mask) {
-		pr_info("AT91: Disabling rtc irq\n");
-		writel_relaxed(mask, base + AT91_RTC_IDR);
-		(void)readl_relaxed(base + AT91_RTC_IMR);	/* flush */
-	}
+	writel_relaxed(0x1f, base + AT91_RTC_IDR);
 
 	iounmap(base);
 }
-- 
1.8.3.2

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