diff options
| author | David Brownell <dbrownell@users.sourceforge.net> | 2008-04-28 02:15:20 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:38 -0700 |
| commit | cf19a37e0641d975d271a5a30f097dd6b96d232f (patch) | |
| tree | bc5876359c353ac5f072cb9858d8dd4e5db731f7 | |
| parent | 01d3a5e7fab7732cfc5d5d4533e9378ea435295a (diff) | |
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.c | 36 | ||||
| -rw-r--r-- | include/video/atmel_lcdc.h | 1 |
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; |