From 8857b9aa7e64a70852545ee01fa638481cb08a76 Mon Sep 17 00:00:00 2001 From: Alexandre Courbot Date: Wed, 23 Feb 2011 08:36:30 +0000 Subject: 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(+) (limited to 'drivers') 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 */ }; -- cgit v1.2.3 From 247f99386100d1d1c369ba98120d2edebf5426fc Mon Sep 17 00:00:00 2001 From: Alexandre Courbot Date: Wed, 23 Feb 2011 08:41:50 +0000 Subject: fbdev: sh_mobile_lcdcfb: fix module lock acquisition Whenever the LCDC is to be started or stopped, a board callback is checked for existence and invoked. Prior to the invokation, the callback's module lock is also acquired, to be released once the callback returns. However, the order of testing makes it possible for the lock to be acquired and not released in case the callback does not exist. This patch reorders the tests to prevent this particular case. Signed-off-by: Alexandre Courbot Signed-off-by: Paul Mundt --- drivers/video/sh_mobile_lcdcfb.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c index 65c4ee3628c4..69e2833bd460 100644 --- a/drivers/video/sh_mobile_lcdcfb.c +++ b/drivers/video/sh_mobile_lcdcfb.c @@ -616,7 +616,7 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv) continue; board_cfg = &ch->cfg.board_cfg; - if (try_module_get(board_cfg->owner) && board_cfg->display_on) { + if (board_cfg->display_on && try_module_get(board_cfg->owner)) { board_cfg->display_on(board_cfg->board_data, ch->info); module_put(board_cfg->owner); } @@ -661,7 +661,7 @@ static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv) } board_cfg = &ch->cfg.board_cfg; - if (try_module_get(board_cfg->owner) && board_cfg->display_off) { + if (board_cfg->display_off && try_module_get(board_cfg->owner)) { board_cfg->display_off(board_cfg->board_data); module_put(board_cfg->owner); } @@ -1228,7 +1228,7 @@ static int sh_mobile_lcdc_notify(struct notifier_block *nb, switch(action) { case FB_EVENT_SUSPEND: - if (try_module_get(board_cfg->owner) && board_cfg->display_off) { + if (board_cfg->display_off && try_module_get(board_cfg->owner)) { board_cfg->display_off(board_cfg->board_data); module_put(board_cfg->owner); } @@ -1241,7 +1241,7 @@ static int sh_mobile_lcdc_notify(struct notifier_block *nb, mutex_unlock(&ch->open_lock); /* HDMI must be enabled before LCDC configuration */ - if (try_module_get(board_cfg->owner) && board_cfg->display_on) { + if (board_cfg->display_on && try_module_get(board_cfg->owner)) { board_cfg->display_on(board_cfg->board_data, info); module_put(board_cfg->owner); } -- cgit v1.2.3