hack.patch

From 1c396bbc7c35c0d421f3a02675e4819aa93bd5e4 Mon Sep 17 00:00:00 2001
From: Karol Herbst <kherbst@redhat.com>
Date: Fri, 27 Jul 2018 15:07:13 +0200
Subject: [PATCH] workaround nouveau runpm issues

---
 drivers/pci/pci.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index dbfe7c4f37768..864c28cd82670 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -689,7 +689,8 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
 	}
 
 	/* enter specified state */
-	pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
+	if (dev->vendor != 0x10de)
+		pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
 
 	/* Mandatory power management transition delays */
 	/* see PCI PM 1.1 5.6.1 table 18 */
@@ -698,7 +699,8 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
 	else if (state == PCI_D2 || dev->current_state == PCI_D2)
 		udelay(PCI_PM_D2_DELAY);
 
-	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
+	if (dev->vendor != 0x10de)
+		pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
 	dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
 	if (dev->current_state != state && printk_ratelimit())
 		pci_info(dev, "Refused to change power state, currently in D%d\n",
@@ -743,7 +745,7 @@ void pci_update_current_state(struct pci_dev *dev, pci_power_t state)
 	if (platform_pci_get_power_state(dev) == PCI_D3cold ||
 	    !pci_device_is_present(dev)) {
 		dev->current_state = PCI_D3cold;
-	} else if (dev->pm_cap) {
+	} else if (dev->pm_cap && dev->vendor != 0x10de) {
 		u16 pmcsr;
 
 		pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);