openwrt/target/linux/s3c24xx/patches-2.6.24/1073-glamo-cmdqueue-bandaid.patch.patch

From ce8eaeee7875e668be4c2888fa05a61a5af0dd98 Mon Sep 17 00:00:00 2001
From: mokopatches <mokopatches@openmoko.org>
Date: Sun, 13 Apr 2008 07:23:59 +0100
Subject: [PATCH] glamo-cmdqueue-bandaid.patch
 [ Stop kernel from hanging every once in a while during Glamo
   initialization. ]

debug-glamo-fb-cmdqueue-wait-timeout.patch

From: warmcat <andy@warmcat.com>
---
 drivers/mfd/glamo/glamo-fb.c |   30 +++++++++++++++++++++++++++---
 1 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/glamo/glamo-fb.c b/drivers/mfd/glamo/glamo-fb.c
index 394a0ad..f0d7600 100644
--- a/drivers/mfd/glamo/glamo-fb.c
+++ b/drivers/mfd/glamo/glamo-fb.c
@@ -553,12 +553,20 @@ static inline int glamofb_cmdq_empty(struct glamofb_handle *gfb)
 
 void glamofb_cmd_mode(struct glamofb_handle *gfb, int on)
 {
+	int timeout = 2000;
+
 	dev_dbg(gfb->dev, "glamofb_cmd_mode(gfb=%p, on=%d)\n", gfb, on);
 	if (on) {
 		dev_dbg(gfb->dev, "%s: waiting for cmdq empty: ",
 			__FUNCTION__);
-		while (!glamofb_cmdq_empty(gfb))
+		while ((!glamofb_cmdq_empty(gfb)) && (timeout--))
 			yield();
+		if (timeout < 0) {
+			printk(KERN_ERR"*************"
+				       "glamofb cmd_queue never got empty"
+				       "*************\n");
+			return;
+		}
 		dev_dbg(gfb->dev, "empty!\n");
 
 		/* display the entire frame then switch to command */
@@ -568,8 +576,16 @@ void glamofb_cmd_mode(struct glamofb_handle *gfb, int on)
 
 		/* wait until LCD is idle */
 		dev_dbg(gfb->dev, "waiting for LCD idle: ");
-		while (!reg_read(gfb, GLAMO_REG_LCD_STATUS2) & (1 << 12))
+		timeout = 2000;
+		while ((!reg_read(gfb, GLAMO_REG_LCD_STATUS2) & (1 << 12)) &&
+		      (timeout--))
 			yield();
+		if (timeout < 0) {
+			printk(KERN_ERR"*************"
+				       "glamofb lcd never idle"
+				       "*************\n");
+			return;
+		}
 		dev_dbg(gfb->dev, "idle!\n");
 
 		msleep(90);
@@ -589,10 +605,18 @@ EXPORT_SYMBOL_GPL(glamofb_cmd_mode);
 
 int glamofb_cmd_write(struct glamofb_handle *gfb, u_int16_t val)
 {
+	int timeout = 2000;
+
 	dev_dbg(gfb->dev, "%s: waiting for cmdq empty\n",
 		__FUNCTION__);
-	while (!glamofb_cmdq_empty(gfb))
+	while ((!glamofb_cmdq_empty(gfb)) && (timeout--))
 		yield();
+	if (timeout < 0) {
+		printk(KERN_ERR"*************"
+				"glamofb cmd_queue never got empty"
+				"*************\n");
+		return 1;
+	}
 	dev_dbg(gfb->dev, "idle, writing 0x%04x\n", val);
 
 	reg_write(gfb, GLAMO_REG_LCD_COMMAND1, val);
-- 
1.5.6.5