xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PM/gxfb: add hook to PM console layer that allows disabling of suspend VT switch

Browse Source 
Prior to suspend, we allocate and switch to a new VT; after suspend, we switch
back to the original VT.  This can be slow, and is completely unnecessary if
the framebuffer we're using can restore video properly.

This adds a hook that allows drivers to select whether or not to do this vt
switch, and changes the gxfb driver to call this hook.  It also adds a module
param to gxfb to allow controlling of the vt switch (defaulting to no switch).

(Note: I'm not convinced that console_sem is the best way to protect this, but
we should probably have some form of locking..)

[akpm@linux-foundation.org: build fix]
Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andres Salomon
2008-04-28 02:15:03 -07:00
committed by Linus Torvalds
parent 46fb6f110d
commit b6f448e99c
4 changed files with 48 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
include/linux/suspend.h
View File

@@ -12,11 +12,22 @@
#include <asm/errno.h>
#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
extern void pm_set_vt_switch(int);
extern int pm_prepare_console(void);
extern void pm_restore_console(void);
#else
static inline int pm_prepare_console(void) { return 0; }
static inline void pm_restore_console(void) {}
static inline void pm_set_vt_switch(int do_switch)
{
}
static inline int pm_prepare_console(void)
{
return 0;
}
static inline void pm_restore_console(void)
{
}
#endif
typedef int __bitwise suspend_state_t;