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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
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