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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-04-28 02:15:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:38 -0700
commitcf19a37e0641d975d271a5a30f097dd6b96d232f (patch)
treebc5876359c353ac5f072cb9858d8dd4e5db731f7
parent01d3a5e7fab7732cfc5d5d4533e9378ea435295a (diff)
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atmel_lcdfb: suspend/resume support
Teach atmel_lcdfb driver how to suspend/resume. Note that the backlight control should probably do more of the same stuff: turning off display power (more than just the backlight) and stopping the clocks (and dma to drive the no-longer-seen display). No point in wasting power to generate images that can't be observed, after all... Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Cc: Hans-Christian Egtvedt <hcegtvedt@atmel.com> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Andrew Victor <avictor.za@gmail.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/video/atmel_lcdfb.c36
-rw-r--r--include/video/atmel_lcdc.h1
2 files changed, 35 insertions, 2 deletions
diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index 4d68b1b880d..6fcf76c1291 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -909,10 +909,42 @@ static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+
+static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+ struct fb_info *info = platform_get_drvdata(pdev);
+ struct atmel_lcdfb_info *sinfo = info->par;
+
+ sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
+ lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
+ if (sinfo->atmel_lcdfb_power_control)
+ sinfo->atmel_lcdfb_power_control(0);
+ atmel_lcdfb_stop_clock(sinfo);
+ return 0;
+}
+
+static int atmel_lcdfb_resume(struct platform_device *pdev)
+{
+ struct fb_info *info = platform_get_drvdata(pdev);
+ struct atmel_lcdfb_info *sinfo = info->par;
+
+ atmel_lcdfb_start_clock(sinfo);
+ if (sinfo->atmel_lcdfb_power_control)
+ sinfo->atmel_lcdfb_power_control(1);
+ lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
+ return 0;
+}
+
+#else
+#define atmel_lcdfb_suspend NULL
+#define atmel_lcdfb_resume NULL
+#endif
+
static struct platform_driver atmel_lcdfb_driver = {
.remove = __exit_p(atmel_lcdfb_remove),
-
-// FIXME need suspend, resume
+ .suspend = atmel_lcdfb_suspend,
+ .resume = atmel_lcdfb_resume,
.driver = {
.name = "atmel_lcdfb",
diff --git a/include/video/atmel_lcdc.h b/include/video/atmel_lcdc.h
index 336c20db87f..2fd9fad922e 100644
--- a/include/video/atmel_lcdc.h
+++ b/include/video/atmel_lcdc.h
@@ -39,6 +39,7 @@ struct atmel_lcdfb_info {
u8 bl_power;
#endif
bool lcdcon_is_backlight;
+ u8 saved_lcdcon;
u8 default_bpp;
unsigned int default_lcdcon2;