linux-kernel - [PATCH 2/3] fb: add support for drivers not needing VT switch at suspend/resume time

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Date:	Mon,  4 Feb 2013 13:37:21 +0000
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	linux-kernel@...r.kernel.org
Cc:	intel-gfx@...ts.freedesktop.org, linux-pm@...r.kernel.org,
	rjw@...k.pl
Subject: [PATCH 2/3] fb: add support for drivers not needing VT switch at suspend/resume time

Use the new PM routines to indicate whether we need to VT switch at suspend
and resume time.  When a new driver is bound, set its flag accordingly,
and when unbound, remove it from the PM's console tracking list.

Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
---
 drivers/video/fbmem.c |    7 +++++++
 include/linux/fb.h    |    2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 3ff0105..240d783 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1643,6 +1643,11 @@ static int do_register_framebuffer(struct fb_info *fb_info)
 	if (!fb_info->modelist.prev || !fb_info->modelist.next)
 		INIT_LIST_HEAD(&fb_info->modelist);
 
+	if (fb_info->skip_vt_switch)
+		pm_vt_switch_required(fb_info->dev, false);
+	else
+		pm_vt_switch_required(fb_info->dev, true);
+
 	fb_var_to_videomode(&mode, &fb_info->var);
 	fb_add_videomode(&mode, &fb_info->modelist);
 	registered_fb[i] = fb_info;
@@ -1673,6 +1678,8 @@ static int do_unregister_framebuffer(struct fb_info *fb_info)
 	if (ret)
 		return -EINVAL;
 
+	pm_vt_switch_unregister(fb_info->dev);
+
 	unlink_framebuffer(fb_info);
 	if (fb_info->pixmap.addr &&
 	    (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
diff --git a/include/linux/fb.h b/include/linux/fb.h
index c7a9571..9a7538a 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -499,6 +499,8 @@ struct fb_info {
 			resource_size_t size;
 		} ranges[0];
 	} *apertures;
+
+	bool skip_vt_switch; /* no VT switch on suspend/resume required */
 };
 
 static inline struct apertures_struct *alloc_apertures(unsigned int max_num) {
-- 
1.7.9.5

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