From 8857b9aa7e64a70852545ee01fa638481cb08a76 Mon Sep 17 00:00:00 2001 From: Alexandre Courbot Date: Wed, 23 Feb 2011 08:36:30 +0000 Subject: [PATCH] fbdev: sh_mobile_lcdcfb: add blanking support Add a blanking callback to the LCDC driver in order to support both FBIOBLANK and TIOCLINUX blanking ioctls. LCDC clocks are also released if the requested blanking level is superior to FB_BLANK_NORMAL, to allow runtime PM to disable the clocks if possible. Signed-off-by: Alexandre Courbot Signed-off-by: Paul Mundt --- drivers/video/sh_mobile_lcdcfb.c | 44 ++++++++++++++++++++++++++++++++ drivers/video/sh_mobile_lcdcfb.h | 1 + 2 files changed, 45 insertions(+) diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c index e040e46d7d91..65c4ee3628c4 100644 --- a/drivers/video/sh_mobile_lcdcfb.c +++ b/drivers/video/sh_mobile_lcdcfb.c @@ -977,6 +977,49 @@ static int sh_mobile_check_var(struct fb_var_screeninfo *var, struct fb_info *in return 0; } +/* + * Screen blanking. Behavior is as follows: + * FB_BLANK_UNBLANK: screen unblanked, clocks enabled + * FB_BLANK_NORMAL: screen blanked, clocks enabled + * FB_BLANK_VSYNC, + * FB_BLANK_HSYNC, + * FB_BLANK_POWEROFF: screen blanked, clocks disabled + */ +static int sh_mobile_lcdc_blank(int blank, struct fb_info *info) +{ + struct sh_mobile_lcdc_chan *ch = info->par; + struct sh_mobile_lcdc_priv *p = ch->lcdc; + + /* blank the screen? */ + if (blank > FB_BLANK_UNBLANK && ch->blank_status == FB_BLANK_UNBLANK) { + struct fb_fillrect rect = { + .width = info->var.xres, + .height = info->var.yres, + }; + sh_mobile_lcdc_fillrect(info, &rect); + } + /* turn clocks on? */ + if (blank <= FB_BLANK_NORMAL && ch->blank_status > FB_BLANK_NORMAL) { + sh_mobile_lcdc_clk_on(p); + } + /* turn clocks off? */ + if (blank > FB_BLANK_NORMAL && ch->blank_status <= FB_BLANK_NORMAL) { + /* make sure the screen is updated with the black fill before + * switching the clocks off. one vsync is not enough since + * blanking may occur in the middle of a refresh. deferred io + * mode will reenable the clocks and update the screen in time, + * so it does not need this. */ + if (!info->fbdefio) { + sh_mobile_wait_for_vsync(info); + sh_mobile_wait_for_vsync(info); + } + sh_mobile_lcdc_clk_off(p); + } + + ch->blank_status = blank; + return 0; +} + static struct fb_ops sh_mobile_lcdc_ops = { .owner = THIS_MODULE, .fb_setcolreg = sh_mobile_lcdc_setcolreg, @@ -985,6 +1028,7 @@ static struct fb_ops sh_mobile_lcdc_ops = { .fb_fillrect = sh_mobile_lcdc_fillrect, .fb_copyarea = sh_mobile_lcdc_copyarea, .fb_imageblit = sh_mobile_lcdc_imageblit, + .fb_blank = sh_mobile_lcdc_blank, .fb_pan_display = sh_mobile_fb_pan_display, .fb_ioctl = sh_mobile_ioctl, .fb_open = sh_mobile_open, diff --git a/drivers/video/sh_mobile_lcdcfb.h b/drivers/video/sh_mobile_lcdcfb.h index 03a22dcbcc59..fad353a7e44c 100644 --- a/drivers/video/sh_mobile_lcdcfb.h +++ b/drivers/video/sh_mobile_lcdcfb.h @@ -37,6 +37,7 @@ struct sh_mobile_lcdc_chan { struct completion vsync_completion; struct fb_var_screeninfo display_var; int use_count; + int blank_status; struct mutex open_lock; /* protects the use counter */ };