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atmel_lcdfb: suspend/resume support

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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>
This commit is contained in:
David Brownell 2008-04-28 02:15:20 -07:00 committed by Linus Torvalds
parent 01d3a5e7fa
commit cf19a37e06
2 changed files with 35 additions and 2 deletions
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36
drivers/video/atmel_lcdfb.c
View file

@ -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",

1
include/video/atmel_lcdc.h
View file

@ -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;