[PATCH 3/5] au1100fb: Add power management support

[PATCH 3/5] au1100fb: Add power management support

[Antonino A. Daplas]

From: Rodolfo Giometti <giometti@linux.it>

Add power management support.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
---

 drivers/video/au1100fb.c |   40 ++++++++++++++++++++++++++++++++++++++--
 1 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/video/au1100fb.c b/drivers/video/au1100fb.c
index f55c16a..0a800bf 100644
--- a/drivers/video/au1100fb.c
+++ b/drivers/video/au1100fb.c
@@ -7,6 +7,8 @@
  *  	Karl Lessard <klessard@sunrisetelecom.com>
  *  	<c.pellegrin@exadron.com>
  *
+ * PM support added by Rodolfo Giometti <giometti@linux.it>
+ *
  * Copyright 2002 MontaVista Software
  * Author: MontaVista Software, Inc.
  *		ppopov@mvista.com or source@mvista.com
@@ -602,17 +604,49 @@ int au1100fb_drv_remove(struct device *d
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static u32 sys_clksrc;
+static struct au1100fb_regs fbregs;
+
 int au1100fb_drv_suspend(struct device *dev, pm_message_t state)
 {
-	/* TODO */
+	struct au1100fb_device *fbdev = (struct au1100fb_device*) dev_get_drvdata(dev);
+
+	if (!fbdev)
+		return 0;
+
+	/* Save the clock source state */
+	sys_clksrc = au_readl(SYS_CLKSRC);
+
+	/* Blank the LCD */
+	au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
+
+	/* Stop LCD clocking */
+	au_writel(sys_clksrc & ~SYS_CS_ML_MASK, SYS_CLKSRC);
+
+	memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
+
 	return 0;
 }
 
 int au1100fb_drv_resume(struct device *dev)
 {
-	/* TODO */
+	struct au1100fb_device *fbdev = (struct au1100fb_device*) dev_get_drvdata(dev);
+
+	if (!fbdev)
+		return 0;
+
+	memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
+
+	/* Restart LCD clocking */
+	au_writel(sys_clksrc, SYS_CLKSRC);
+
+	/* Unblank the LCD */
+	au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
+
 	return 0;
 }
+#endif
 
 static struct device_driver au1100fb_driver = {
 	.name		= "au1100-lcd",
@@ -620,8 +654,10 @@ static struct device_driver au1100fb_dri
 
 	.probe		= au1100fb_drv_probe,
         .remove		= au1100fb_drv_remove,
+#ifdef CONFIG_PM
 	.suspend	= au1100fb_drv_suspend,
         .resume		= au1100fb_drv_resume,
+#endif
 };
 
 /*-------------------------------------------------------------------------*/




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Re: [PATCH 3/5] au1100fb: Add power management support

[Andrew Morton]

On Sun, 28 May 2006 08:42:37 +0800
"Antonino A. Daplas" <adaplas@gmail.com> wrote:

> From: Rodolfo Giometti <giometti@linux.it>
> 
> Add power management support.
> 
>  int au1100fb_drv_suspend(struct device *dev, pm_message_t state)
>  {
> -	/* TODO */
> +	struct au1100fb_device *fbdev = (struct au1100fb_device*) dev_get_drvdata(dev);
>  
>  int au1100fb_drv_resume(struct device *dev)
>  {
> -	/* TODO */
> +	struct au1100fb_device *fbdev = (struct au1100fb_device*) dev_get_drvdata(dev);

These typecasts of void* are unneeded.  They are in fact undesirable - if
someone were to change the type of dev_get_drvdata() to return some
non-pointer type then this code would still silently swallow it without
warning us of the bug.

Plus typecasts are ugly.


This patch doesn't apply, probably due to the earlier mangled one whihc I dropped.
Please redo and resend this one as well.



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