linux-kernel - [PATCH] serial: samsung: Use printk instead of printascii for S3C

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Date:	Wed, 27 Mar 2013 19:39:58 -0400
From:	Michael Spang <spang@...omium.org>
To:	Kukjin Kim <kgene.kim@...sung.com>, Ben Dooks <ben-linux@...ff.org>
Cc:	Russell King <linux@....linux.org.uk>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michael Spang <spang@...omium.org>
Subject: [PATCH] serial: samsung: Use printk instead of printascii for S3C_PMDBG

Users should use no_console_suspend if they want output during
suspend, rather than relying on DEBUG_LL. Using DEBUG_LL has two
disadvantages:

1. It doesn't respect power management. When the UART is suspended
   the clock is stopped, and trying to use DEBUG_LL will just hang.

   This means if the user selects CONFIG_SAMSUNG_PM_DEBUG but does
   NOT disable console suspend, the system will hang during suspend.

2. It skips syslog and other console devices such as pstore.

Signed-off-by: Michael Spang <spang@...omium.org>
---
 arch/arm/plat-samsung/include/plat/pm.h | 14 --------------
 arch/arm/plat-samsung/pm.c              | 13 -------------
 2 files changed, 27 deletions(-)

diff --git a/arch/arm/plat-samsung/include/plat/pm.h b/arch/arm/plat-samsung/include/plat/pm.h
index f6fcade..6d6e2a8 100644
--- a/arch/arm/plat-samsung/include/plat/pm.h
+++ b/arch/arm/plat-samsung/include/plat/pm.h
@@ -116,21 +116,7 @@ extern int s3c_irqext_wake(struct irq_data *data, unsigned int state);
 
 /* PM debug functions */
 
-#ifdef CONFIG_SAMSUNG_PM_DEBUG
-/**
- * s3c_pm_dbg() - low level debug function for use in suspend/resume.
- * @msg: The message to print.
- *
- * This function is used mainly to debug the resume process before the system
- * can rely on printk/console output. It uses the low-level debugging output
- * routine printascii() to do its work.
- */
-extern void s3c_pm_dbg(const char *msg, ...);
-
-#define S3C_PMDBG(fmt...) s3c_pm_dbg(fmt)
-#else
 #define S3C_PMDBG(fmt...) printk(KERN_DEBUG fmt)
-#endif
 
 #ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
 /**
diff --git a/arch/arm/plat-samsung/pm.c b/arch/arm/plat-samsung/pm.c
index 002b147..7459fc6 100644
--- a/arch/arm/plat-samsung/pm.c
+++ b/arch/arm/plat-samsung/pm.c
@@ -43,19 +43,6 @@ unsigned long s3c_pm_flags;
 */
 
 #ifdef CONFIG_SAMSUNG_PM_DEBUG
-extern void printascii(const char *);
-
-void s3c_pm_dbg(const char *fmt, ...)
-{
-	va_list va;
-	char buff[256];
-
-	va_start(va, fmt);
-	vsnprintf(buff, sizeof(buff), fmt, va);
-	va_end(va);
-
-	printascii(buff);
-}
 
 static inline void s3c_pm_debug_init(void)
 {
-- 
1.8.1.3

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