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au1100fb suspend/resume support

PATCH New Rodolfo Giometti 1 participant 1 message Apr 10, 2006

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MIPS Framebuffer layer
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Rodolfo Giometti

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PATCH 1/1 au1100fb suspend/resume support

Hello,

here a patch for au1100fb.c in order to add suspend/resume support.

Ciao,

Rodolfo

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GNU/Linux Solutions                  e-mail:    [email protected]
Linux Device Driver                             [email protected]
Embedded Systems                     		[email protected]
UNIX programming                     phone:     +39 349 2432127

Index: drivers/video/au1100fb.c
===================================================================
RCS file: /home/develop/cvs_private/linux-mips-exadron/drivers/video/au1100fb.c,v retrieving revision 1.7

drivers/video/au1100fb.c +55 -2
diff -u -r1.7 au1100fb.c
@@ -7,6 +7,8 @@
  *  	Karl Lessard <[email protected]>
  *  	<[email protected]>
  *
+ * PM support added by Rodolfo Giometti <[email protected]>
+ *
  * Copyright 2002 MontaVista Software
  * Author: MontaVista Software, Inc.
  *		[email protected] or [email protected]

@@ -648,17 +650,66 @@
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static u32 sys_clksrc;
+static struct au1100fb_regs fbregs;
 int au1100fb_drv_suspend(struct device *dev, u32 state, u32 level)
 {
-	/* TODO */
+	struct au1100fb_device *fbdev = (struct au1100fb_device*) dev_get_drvdata(dev);
+
+	if (!fbdev)
+		return 0;
+
+	switch (level) {
+	case SUSPEND_DISABLE :
+		/* 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_MUD_MASK, SYS_CLKSRC);
+
+		break;
+
+	case SUSPEND_SAVE_STATE :
+		memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
+
+		break;
+
+	case SUSPEND_POWER_DOWN :
+
+		break;
+	}
+
 	return 0;
 }
 
 int au1100fb_drv_resume(struct device *dev, u32 level)
 {
-	/* TODO */
+	struct au1100fb_device *fbdev = (struct au1100fb_device*) dev_get_drvdata(dev);
+
+	if (!fbdev)
+		return 0;
+
+	switch (level) {
+	case RESUME_RESTORE_STATE :
+		memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
+
+		break;
+
+	case RESUME_ENABLE :
+		au_writel(sys_clksrc, SYS_CLKSRC);
+
+		au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
+
+		break;
+	}
+
 	return 0;
 }
+#endif
 
 static struct device_driver au1100fb_driver = {
 	.name		= "au1100-lcd",

@@ -666,8 +717,10 @@
 
 	.probe		= au1100fb_drv_probe,
         .remove		= au1100fb_drv_remove,
+#ifdef CONFIG_PM
 	.suspend	= au1100fb_drv_suspend,
         .resume		= au1100fb_drv_resume,
+#endif
 };
     
 /*-------------------------------------------------------------------------*/