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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 <gnurou@gmail.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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2 changed files with 45 additions and 0 deletions
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@ -977,6 +977,49 @@ static int sh_mobile_check_var(struct fb_var_screeninfo *var, struct fb_info *in
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return 0;
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}
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/*
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* Screen blanking. Behavior is as follows:
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* FB_BLANK_UNBLANK: screen unblanked, clocks enabled
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* FB_BLANK_NORMAL: screen blanked, clocks enabled
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* FB_BLANK_VSYNC,
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* FB_BLANK_HSYNC,
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* FB_BLANK_POWEROFF: screen blanked, clocks disabled
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*/
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static int sh_mobile_lcdc_blank(int blank, struct fb_info *info)
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{
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struct sh_mobile_lcdc_chan *ch = info->par;
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struct sh_mobile_lcdc_priv *p = ch->lcdc;
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/* blank the screen? */
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if (blank > FB_BLANK_UNBLANK && ch->blank_status == FB_BLANK_UNBLANK) {
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struct fb_fillrect rect = {
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.width = info->var.xres,
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.height = info->var.yres,
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};
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sh_mobile_lcdc_fillrect(info, &rect);
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}
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/* turn clocks on? */
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if (blank <= FB_BLANK_NORMAL && ch->blank_status > FB_BLANK_NORMAL) {
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sh_mobile_lcdc_clk_on(p);
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}
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/* turn clocks off? */
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if (blank > FB_BLANK_NORMAL && ch->blank_status <= FB_BLANK_NORMAL) {
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/* make sure the screen is updated with the black fill before
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* switching the clocks off. one vsync is not enough since
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* blanking may occur in the middle of a refresh. deferred io
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* mode will reenable the clocks and update the screen in time,
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* so it does not need this. */
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if (!info->fbdefio) {
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sh_mobile_wait_for_vsync(info);
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sh_mobile_wait_for_vsync(info);
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}
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sh_mobile_lcdc_clk_off(p);
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}
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ch->blank_status = blank;
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return 0;
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}
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static struct fb_ops sh_mobile_lcdc_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = sh_mobile_lcdc_setcolreg,
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@ -985,6 +1028,7 @@ static struct fb_ops sh_mobile_lcdc_ops = {
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.fb_fillrect = sh_mobile_lcdc_fillrect,
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.fb_copyarea = sh_mobile_lcdc_copyarea,
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.fb_imageblit = sh_mobile_lcdc_imageblit,
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.fb_blank = sh_mobile_lcdc_blank,
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.fb_pan_display = sh_mobile_fb_pan_display,
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.fb_ioctl = sh_mobile_ioctl,
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.fb_open = sh_mobile_open,
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@ -37,6 +37,7 @@ struct sh_mobile_lcdc_chan {
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struct completion vsync_completion;
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struct fb_var_screeninfo display_var;
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int use_count;
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int blank_status;
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struct mutex open_lock; /* protects the use counter */
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};
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