[PATCH] au1100fb: add power management support

Add power management support

[akpm@osdl.org: cleanup]
Signed-off-by: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 39 insertions, 2 deletions

diff --git a/drivers/video/au1100fb.c b/drivers/video/au1100fb.c
index 789450bb0bc9..d63c3f485853 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 +604,52 @@ int au1100fb_drv_remove(struct device *dev)
         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 = 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 = 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;
 }
+#else
+#define au1100fb_drv_suspend NULL
+#define au1100fb_drv_resume NULL
+#endif
 
 static struct device_driver au1100fb_driver = {
         .name           = "au1100-lcd",