[patch] USB after second suspend/resume on ThinkPads.

[John Baldwin]

On Wednesday, June 18, 2014 12:13:15 pm Edward Tomasz Napierała wrote:
> On 0618T0947, John Baldwin wrote:
> > On Monday, June 16, 2014 3:21:55 pm Edward Tomasz Napierała wrote:
> > > Hi.  Patch below should fix a problem where USB stops working after
> > > _second_ suspend/resume, which happens on various ThinkPad models.
> > > Please test, and report both success stories and failures.  If nothing
> > > comes up, I'll commit it in a week or so.
> > 
> > Good find.  Have you thought about a more generic fix for this wherein you 
> > track power resources and flip them on during resume in ACPI before doing
> > DEVICE_RESUME() on the root bus?
> 
> Thing is, after resume this device claims to be on already.  The following
> simple hack was enough to make it work:

Ahh, I think I see.  Try this instead:

Index: sys/dev/acpica/acpi_powerres.c
===================================================================
--- acpi_powerres.c	(revision 267550)
+++ acpi_powerres.c	(working copy)
@@ -645,7 +645,7 @@ acpi_pwr_switch_power(void)
 			      acpi_name(rp->ap_resource), status));
 	    /* XXX is this correct?  Always switch if in doubt? */
 	    continue;
-	} else if (rp->ap_state == ACPI_PWR_UNK)
+	} else
 	    rp->ap_state = cur;
 
 	/*
@@ -689,7 +689,7 @@ acpi_pwr_switch_power(void)
 			      acpi_name(rp->ap_resource), status));
 	    /* XXX is this correct?  Always switch if in doubt? */
 	    continue;
-	} else if (rp->ap_state == ACPI_PWR_UNK)
+	} else
 	    rp->ap_state = cur;
 
 	/*

(We were ignoring what _STA told us and believed it was ON because we had
 cached that state previously.)

-- 
John Baldwin