From: Vineet Gupta <vgupta@synopsys.com>
Date: Thu, 12 Sep 2013 08:23:06 +0000 (+0530)
Subject: ARC: Reset the value of Interrupt Priority Register
X-Git-Tag: v3.13-rc1~153^2~15
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=54c8bff14d604de23d0718eee59c5436a4703fe5;p=profile%2Fcommon%2Fkernel-common.git

ARC: Reset the value of Interrupt Priority Register

In case bootloader has changed the priority of one/more IRQ lines

Reported-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---

diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c
index 5fc9245..02684e1 100644
--- a/arch/arc/kernel/irq.c
+++ b/arch/arc/kernel/irq.c
@@ -39,10 +39,14 @@ void arc_init_IRQ(void)
 	level_mask |= IS_ENABLED(CONFIG_ARC_IRQ5_LV2) << 5;
 	level_mask |= IS_ENABLED(CONFIG_ARC_IRQ6_LV2) << 6;
 
-	if (level_mask) {
+	/*
+	 * Write to register, even if no LV2 IRQs configured to reset it
+	 * in case bootloader had mucked with it
+	 */
+	write_aux_reg(AUX_IRQ_LEV, level_mask);
+
+	if (level_mask)
 		pr_info("Level-2 interrupts bitset %x\n", level_mask);
-		write_aux_reg(AUX_IRQ_LEV, level_mask);
-	}
 }
 
 /*