This patch (as1558) fixes a problem affecting several ASUS computers: The machine crashes or corrupts memory when going into suspend if the ehci-hcd driver is bound to any controllers. Users have been forced to unbind or unload ehci-hcd before putting their systems to sleep. After extensive testing, it was determined that the machines don't like going into suspend when any EHCI controllers are in the PCI D3 power state. Presumably this is a firmware bug, but there's nothing we can do about it except to avoid putting the controllers in D3 during system sleep. The patch adds a new flag to indicate whether the problem is present, and avoids changing the controller's power state if the flag is set. Runtime suspend is unaffected; this matters only for system suspend. However as a side effect, the controller will not respond to remote wakeup requests while the system is asleep. Hence USB wakeup is not functional -- but of course, this is already true in the current state of affairs. A similar patch has already been applied as commit 151b61284776be2d6f02d48c23c3625678960b97 (USB: EHCI: fix crash during suspend on ASUS computers). The patch supersedes that one and reverts it. There are two differences: The old patch added the flag at the USB level; this patch adds it at the PCI level. The old patch applied to all chipsets with the same vendor, subsystem vendor, and product IDs; this patch makes an exception for a known-good system (based on DMI information).
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| @@ -176,6 +176,8 @@ enum pci_dev_flags { · 175 unmodified lines | ||
| 176 | 176 | PCI_DEV_FLAGS_NO_D3 = (__force pci_dev_flags_t) 2, |
| 177 | 177 | /* Provide indication device is assigned by a Virtual Machine Manager */ |
| 178 | 178 | PCI_DEV_FLAGS_ASSIGNED = (__force pci_dev_flags_t) 4, |
| 179 | + /* Device causes system crash if in D3 during S3 sleep */ | |
| 180 | + PCI_DEV_FLAGS_NO_D3_DURING_SLEEP = (__force pci_dev_flags_t) 8, | |
| 179 | 181 | }; |
| 180 | 182 | |
| 181 | 183 | enum pci_irq_reroute_variant { |
| @@ -126,8 +126,6 @@ struct usb_hcd { · 125 unmodified lines | ||
| 126 | 126 | unsigned wireless:1; /* Wireless USB HCD */ |
| 127 | 127 | unsigned authorized_default:1; |
| 128 | 128 | unsigned has_tt:1; /* Integrated TT in root hub */ |
| 129 | − unsigned broken_pci_sleep:1; /* Don't put the | |
| 130 | − controller in PCI-D3 for system sleep */ | |
| 131 | 129 | |
| 132 | 130 | unsigned int irq; /* irq allocated */ |
| 133 | 131 | void __iomem *regs; /* device memory/io */ |