[PATCH] Revert "nouveau: pci: quiesce GPU on shutdown"

[Marek Vasut]

This reverts commit 310326bb7df4bba094a3fc60364c641c547fd923.

This breaks shutdown on ThinkPad W510, without the offending commit
the system normally powers off, with the offending commit the system
ends up spinning indefinitely and the CPU fan goes full throttle on
shutdown.

The behavior was already reported in debian bugtracker multiple times
for various other computers too, and git bisect lands as this commit.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1141969
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1146033

I tested the revert with Linux 7.2.12 from debian unstable, not next
or drm trees, mainly because it was easier with debian test-patches
script on that machine.

Signed-off-by: Marek Vasut <marex@xxxxxxxxxxxx>
---
Cc: Danilo Krummrich <dakr@xxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxxx>
Cc: Li Chen <me@linux.beauty>
Cc: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: Ole Carlsen <ole.carlsen@xxxxxxxxxxxx>
Cc: Simona Vetter <simona@xxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: Uwe Kleine-König <ukleinek@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: nouveau@xxxxxxxxxxxxxxxxxxxxx
---
NOTE: Maybe the revert is not the ideal solution, but it does fix my
      problem, and I think being able to shut computer down is a good
      functionality to have.
---
 drivers/gpu/drm/nouveau/nouveau_drm.c | 32 ---------------------------
 1 file changed, 32 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 5e1336615cf6d..36c74f9edaa83 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -1090,37 +1090,6 @@ nouveau_pmops_resume(struct device *dev)
 	return ret;
 }
 
-static void
-nouveau_drm_shutdown(struct pci_dev *pdev)
-{
-	struct nouveau_drm *drm = pci_get_drvdata(pdev);
-	int ret;
-
-	if (!drm)
-		return;
-
-	if (drm->dev->switch_power_state == DRM_SWITCH_POWER_OFF ||
-	    drm->dev->switch_power_state == DRM_SWITCH_POWER_DYNAMIC_OFF)
-		return;
-
-	ret = nouveau_do_suspend(drm, false);
-	if (ret)
-		NV_ERROR(drm, "shutdown suspend failed with: %d\n", ret);
-
-	pci_save_state(pdev);
-	pci_disable_device(pdev);
-	pci_set_power_state(pdev, PCI_D3hot);
-	/*
-	 *  This is just to give the pci power transition time to settle
-	 *  before an immediate kexec jump. it’s mirroring the existing
-	 *  nouveau_pmops_suspend() behavior, which already does
-	 *  udelay(200) right after pci_set_power_state(..., pci_d3hot). In
-	 *  ->shutdown() we’re allowed to sleep, so I used usleep_range()
-	 *  instead of a busy-wait udelay().
-	 */
-	usleep_range(200, 400);
-}
-
 static int
 nouveau_pmops_freeze(struct device *dev)
 {
@@ -1480,7 +1449,6 @@ nouveau_drm_pci_driver = {
 	.id_table = nouveau_drm_pci_table,
 	.probe = nouveau_drm_probe,
 	.remove = nouveau_drm_remove,
-	.shutdown = nouveau_drm_shutdown,
 	.driver.pm = &nouveau_pm_ops,
 };
 
-- 
2.53.0