[src/trunk]: src/sys/dev/acpi Evaluate _TTS on sleep state transitions. This ...

[jruoho <jruoho%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/eb30d63babf4
branches:  trunk
changeset: 754261:eb30d63babf4
user:      jruoho <jruoho%NetBSD.org@localhost>
date:      Sun Apr 25 10:05:22 2010 +0000

description:
Evaluate _TTS on sleep state transitions. This is mainly to pro-actively
support some weird BIOS, which may require the evaluation. Ok jmcneill@.

diffstat:

 sys/dev/acpi/acpi.c |  23 +++++++++++++++++++++--
 1 files changed, 21 insertions(+), 2 deletions(-)

diffs (65 lines):

diff -r 9c6ef1d2c663 -r eb30d63babf4 sys/dev/acpi/acpi.c
--- a/sys/dev/acpi/acpi.c       Sun Apr 25 09:14:38 2010 +0000
+++ b/sys/dev/acpi/acpi.c       Sun Apr 25 10:05:22 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: acpi.c,v 1.188 2010/04/25 09:12:38 jruoho Exp $        */
+/*     $NetBSD: acpi.c,v 1.189 2010/04/25 10:05:22 jruoho Exp $        */
 
 /*-
  * Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
@@ -65,7 +65,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi.c,v 1.188 2010/04/25 09:12:38 jruoho Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi.c,v 1.189 2010/04/25 10:05:22 jruoho Exp $");
 
 #include "opt_acpi.h"
 #include "opt_pcifixup.h"
@@ -1463,6 +1463,19 @@
                }
 
                /*
+                * Evaluate the _TTS method, which should be called
+                * before _PTS. We should also re-evaluate this once
+                * we return to S0 (see ACPI 3.0, section 7.3.6).
+                * In reality, _TTS is seldom seen in the field.
+                */
+               rv = acpi_eval_set_integer(NULL, "\\_TTS", state);
+
+               if (ACPI_SUCCESS(rv))
+                       aprint_debug_dev(sc->sc_dev, "evaluated _TTS\n");
+
+               rv = AE_OK;
+
+               /*
                 * This will evaluate the  _PTS and _SST methods,
                 * but unlike the documentation claims, not _GTS,
                 * which is evaluated in AcpiEnterSleepState().
@@ -1504,8 +1517,11 @@
                }
 
                break;
+
        case ACPI_STATE_S5:
 
+               (void)acpi_eval_set_integer(NULL, "\\_TTS", state);
+
                rv = AcpiEnterSleepStatePrep(ACPI_STATE_S5);
 
                if (ACPI_FAILURE(rv)) {
@@ -1522,11 +1538,14 @@
                (void)AcpiEnterSleepState(ACPI_STATE_S5);
 
                aprint_error_dev(sc->sc_dev, "WARNING: powerdown failed!\n");
+
                break;
        }
 
        sc->sc_sleepstate = ACPI_STATE_S0;
 
+       (void)acpi_eval_set_integer(NULL, "\\_TTS", ACPI_STATE_S0);
+
        return rv;
 }