Give new home to the comment from ppt_pci_reset(), explaining a nuance

of power reset. Noted by: soralx@cydem.org Sponsored by: Mellanox Technologies MFC after: 12 days
svn path=/head/; revision=345997
2019-04-07 08:58:09 +00:00 · 2019-04-07 08:58:09 +00:00 · ca19084f36 · 2020-12-20 02:59:44 +00:00
commit ca19084f36
parent bca4681bf8
1 changed files with 5 additions and 0 deletions
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@ -6394,6 +6394,11 @@ pcie_flr(device_t dev, u_int max_delay, bool force)
 	return (true);
 }

+/*
+ * Attempt a power-management reset by cycling the device in/out of D3
+ * state.  PCI spec says we can only go into D3 state from D0 state.
+ * Transition from D[12] into D0 before going to D3 state.
+ */
 int
 pci_power_reset(device_t dev)
 {