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Subject[PATCH] atmel_lcdfb: suspend/resume support
From: David Brownell <dbrownell@users.sourceforge.net>

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>
---
It applies on top of :
atmel_lcdfb-dont-initialize-a-pre-allocated-framebuffer.patch
already in the -mm tree.

drivers/video/atmel_lcdfb.c | 36 ++++++++++++++++++++++++++++++++++--
include/video/atmel_lcdc.h | 1 +
2 files changed, 35 insertions(+), 2 deletions(-)

--- linux-2.6.x-rc.orig/drivers/video/atmel_lcdfb.c
+++ linux-2.6.x-rc/drivers/video/atmel_lcdfb.c
@@ -909,10 +909,42 @@ static int __exit atmel_lcdfb_remove(str
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",
--- linux-2.6.x-rc.orig/include/video/atmel_lcdc.h
+++ linux-2.6.x-rc/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;


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