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drm/i915: restore only the mode of this driver on lastclose (v2)

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i915 calls the panic handler function on last close to reset the modes,
however this is a really bad idea for multi-gpu machines, esp shareable
gpus machines. So add a new entry point for the driver to just restore
its own fbcon mode.

v2: move code into fb helper, fix panic code to block mode change on
powered off GPUs.

[airlied: this hits drm core and I wrote it and it was reviewed on intel-gfx
 so really I signed it off twice ;-).]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2011-04-21 22:18:32 +01:00
parent 6565945b60
commit e8e7a2b8cc
5 changed files with 33 additions and 8 deletions
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27
drivers/gpu/drm/drm_fb_helper.c
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@ -342,9 +342,22 @@ int drm_fb_helper_debug_leave(struct fb_info *info)
}
EXPORT_SYMBOL(drm_fb_helper_debug_leave);
bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
{
bool error = false;
int i, ret;
for (i = 0; i < fb_helper->crtc_count; i++) {
struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
ret = drm_crtc_helper_set_config(mode_set);
if (ret)
error = true;
}
return error;
}
EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
bool drm_fb_helper_force_kernel_mode(void)
{
int i = 0;
bool ret, error = false;
struct drm_fb_helper *helper;
@ -352,12 +365,12 @@ bool drm_fb_helper_force_kernel_mode(void)
return false;
list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
for (i = 0; i < helper->crtc_count; i++) {
struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
ret = drm_crtc_helper_set_config(mode_set);
if (ret)
error = true;
}
if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
continue;
ret = drm_fb_helper_restore_fbdev_mode(helper);
if (ret)
error = true;
}
return error;
}