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Save and restore the VGA state across a suspend-resume cycle. This

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is particularly useful when VESA is available (either `options VESA'
or load the vesa module), as BIOSes in some notebooks may correctly
save and restore LCD panel settings using VESA in cases where calling
the video BIOS POST is not effective. On some systems it may also
be necessary to set the hw.acpi.reset_video sysctl to 0.
This commit is contained in:
Ian Dowse 2005-02-28 21:06:14 +00:00
parent e2db8d3732
commit 528433ba71
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=142833
2 changed files with 56 additions and 0 deletions
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1
sys/dev/fb/vgareg.h
View File

@ -69,6 +69,7 @@
struct video_adapter;
typedef struct vga_softc {
struct video_adapter *adp;
void *state_buf;
#ifdef FB_INSTALL_CDEV
genfb_softc_t gensc;
#endif

55
sys/isa/vga_isa.c
View File

@ -34,6 +34,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/conf.h>
#include <sys/bus.h>
@ -159,6 +160,58 @@ isavga_attach(device_t dev)
return 0;
}
static int
isavga_suspend(device_t dev)
{
vga_softc_t *sc;
int err, nbytes;
sc = device_get_softc(dev);
err = bus_generic_suspend(dev);
if (err)
return (err);
/* Save the video state across the suspend. */
if (sc->state_buf != NULL) {
free(sc->state_buf, M_TEMP);
sc->state_buf = NULL;
}
nbytes = (*vidsw[sc->adp->va_index]->save_state)(sc->adp, NULL, 0);
if (nbytes <= 0)
return (0);
sc->state_buf = malloc(nbytes, M_TEMP, M_NOWAIT | M_ZERO);
if (sc->state_buf == NULL)
return (0);
if (bootverbose)
device_printf(dev, "saving %d bytes of video state\n", nbytes);
if ((*vidsw[sc->adp->va_index]->save_state)(sc->adp, sc->state_buf,
nbytes) != 0) {
device_printf(dev, "failed to save state (nbytes=%d)\n",
nbytes);
free(sc->state_buf, M_TEMP);
sc->state_buf = NULL;
}
return (0);
}
static int
isavga_resume(device_t dev)
{
vga_softc_t *sc;
sc = device_get_softc(dev);
if (sc->state_buf != NULL) {
if ((*vidsw[sc->adp->va_index]->load_state)(sc->adp,
sc->state_buf) != 0)
device_printf(dev, "failed to reload state\n");
free(sc->state_buf, M_TEMP);
sc->state_buf = NULL;
}
bus_generic_resume(dev);
return 0;
}
#ifdef FB_INSTALL_CDEV
static int
@ -203,6 +256,8 @@ static device_method_t isavga_methods[] = {
DEVMETHOD(device_identify, isavga_identify),
DEVMETHOD(device_probe, isavga_probe),
DEVMETHOD(device_attach, isavga_attach),
DEVMETHOD(device_suspend, isavga_suspend),
DEVMETHOD(device_resume, isavga_resume),
DEVMETHOD(bus_print_child, bus_generic_print_child),
{ 0, 0 }