[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>

diff --git a/drivers/video/au1100fb.c b/drivers/video/au1100fb.c
index 789450b..d63c3f4 100644 (file)
--- 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",