Commit cf19a37e authored by David Brownell's avatar David Brownell Committed by Linus Torvalds
Browse files

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: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarNicolas 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 01d3a5e7

drivers/video/atmel_lcdfb.c

+34 −2
Original line number Diff line number Diff line
@@ -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",

include/video/atmel_lcdc.h

+1 −0
Original line number Diff line number Diff line
@@ -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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