pxafb: use completion for LCD disable wait code

Signed-off-by: eric miao <eric.miao@marvell.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 6 insertions, 8 deletions

diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index 417561779ec2..a4ee7225fe2c 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -39,6 +39,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/clk.h>
 #include <linux/err.h>
+#include <linux/completion.h>
 
 #include <asm/hardware.h>
 #include <asm/io.h>
@@ -810,11 +811,6 @@ static void pxafb_disable_controller(struct pxafb_info *fbi)
 {
         uint32_t lccr0;
 
-        DECLARE_WAITQUEUE(wait, current);
-
-        set_current_state(TASK_UNINTERRUPTIBLE);
-        add_wait_queue(&fbi->ctrlr_wait, &wait);
-
         /* Clear LCD Status Register */
         lcd_writel(fbi, LCSR, 0xffffffff);
 
@@ -822,8 +818,7 @@ static void pxafb_disable_controller(struct pxafb_info *fbi)
         lcd_writel(fbi, LCCR0, lccr0);
         lcd_writel(fbi, LCCR0, lccr0 | LCCR0_DIS);
 
-        schedule_timeout(200 * HZ / 1000);
-        remove_wait_queue(&fbi->ctrlr_wait, &wait);
+        wait_for_completion_timeout(&fbi->disable_done, 200 * HZ / 1000);
 
         /* disable LCD controller clock */
         clk_disable(fbi->clk);
@@ -840,7 +835,7 @@ static irqreturn_t pxafb_handle_irq(int irq, void *dev_id)
         if (lcsr & LCSR_LDD) {
                 lccr0 = lcd_readl(fbi, LCCR0);
                 lcd_writel(fbi, LCCR0, lccr0 | LCCR0_LDM);
-                wake_up(&fbi->ctrlr_wait);
+                complete(&fbi->disable_done);
         }
 
         lcd_writel(fbi, LCSR, lcsr);
@@ -1190,6 +1185,7 @@ static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev)
         init_waitqueue_head(&fbi->ctrlr_wait);
         INIT_WORK(&fbi->task, pxafb_task);
         init_MUTEX(&fbi->ctrlr_sem);
+        init_completion(&fbi->disable_done);
 
         return fbi;
 }
diff --git a/drivers/video/pxafb.h b/drivers/video/pxafb.h
index b777641c5e70..f47f139fc5ed 100644
--- a/drivers/video/pxafb.h
+++ b/drivers/video/pxafb.h
@@ -114,6 +114,8 @@ struct pxafb_info {
         wait_queue_head_t       ctrlr_wait;
         struct work_struct      task;
 
+        struct completion       disable_done;
+
 #ifdef CONFIG_CPU_FREQ
         struct notifier_block   freq_transition;
         struct notifier_block   freq_policy;