From: Magnus Damm <damm@opensource.se>
Date: Wed, 9 Nov 2011 23:44:01 +0000 (+0100)
Subject: ARM: mach-shmobile: sh7372 A3SP no_suspend_console fix
X-Git-Tag: firefly_0821_release~3680^2~4075^2~11
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=056879d2f244001b2888cdc8cf868c33ca8b23a0;p=firefly-linux-kernel-4.4.55.git

ARM: mach-shmobile: sh7372 A3SP no_suspend_console fix

If "no_suspend_irq" is used on the sh7372 Mackerel board
with v3.2-rc1 then Suspend-to-RAM fails because the serial
console tries to write to the SCIF driver even though the
power domain is turned off.

This patch checks the state of "console_suspend_enabled"
to see if A3SP should be forced enabled.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---

diff --git a/arch/arm/mach-shmobile/pm-sh7372.c b/arch/arm/mach-shmobile/pm-sh7372.c
index e26138352f07..78c98a847433 100644
--- a/arch/arm/mach-shmobile/pm-sh7372.c
+++ b/arch/arm/mach-shmobile/pm-sh7372.c
@@ -20,6 +20,7 @@
 #include <linux/delay.h>
 #include <linux/irq.h>
 #include <linux/bitrev.h>
+#include <linux/console.h>
 #include <asm/system.h>
 #include <asm/io.h>
 #include <asm/tlbflush.h>
@@ -469,6 +470,11 @@ void __init sh7372_pm_init(void)
 	/* do not convert A3SM, A3SP, A3SG, A4R power down into A4S */
 	__raw_writel(0, PDNSEL);
 
+	/* serial consoles make use of SCIF hardware located in A3SP,
+	 * keep such power domain on if "no_console_suspend" is set.
+	 */
+	sh7372_a3sp.stay_on = !console_suspend_enabled;
+
 	sh7372_suspend_init();
 	sh7372_cpuidle_init();
 }