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drm/udl: implement usb_driver suspend/resume.

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The usb_driver suspend and resume function pointers must be populated
to prevent forced unbinding of USB interface driver. See usb/core/driver.c:
unbind_no_pm_drivers_interfaces().

Restore mode and damage the entire frame buffer upon resume.

TEST=suspend and resume with the same UDL device connected
TEST=suspend with UDL, unplug UDL and resume
TEST=suspend with UDL, unplug and connect another UDL device then resume

Signed-off-by: Haixia Shi <hshi@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
[seanpaul fixed checkpatch warnings and gave marcheu his é back]
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1472593821-38429-2-git-send-email-hshi@chromium.org
This commit is contained in:
Haixia Shi
2016-08-30 14:50:21 -07:00
committed by Sean Paul
parent ae0119f5f7
commit 737ba10928
3 changed files with 32 additions and 0 deletions
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16
drivers/gpu/drm/udl/udl_drv.c
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@@ -16,6 +16,20 @@ static int udl_driver_set_busid(struct drm_device *d, struct drm_master *m)
return 0;
}
static int udl_usb_suspend(struct usb_interface *interface,
pm_message_t message)
{
return 0;
}
static int udl_usb_resume(struct usb_interface *interface)
{
struct drm_device *dev = usb_get_intfdata(interface);
udl_modeset_restore(dev);
return 0;
}
static const struct vm_operations_struct udl_gem_vm_ops = {
.fault = udl_gem_fault,
.open = drm_gem_vm_open,
@@ -122,6 +136,8 @@ static struct usb_driver udl_driver = {
.name = "udl",
.probe = udl_usb_probe,
.disconnect = udl_usb_disconnect,
.suspend = udl_usb_suspend,
.resume = udl_usb_resume,
.id_table = id_table,
};
module_usb_driver(udl_driver);