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path: root/drivers/misc/thinkpad_acpi.c
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Diffstat (limited to 'drivers/misc/thinkpad_acpi.c')
-rw-r--r--drivers/misc/thinkpad_acpi.c57
1 files changed, 45 insertions, 12 deletions
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 7a4a26b0edd2..899766e16fa8 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -5318,6 +5318,7 @@ static enum fan_control_commands fan_control_commands;
static u8 fan_control_initial_status;
static u8 fan_control_desired_level;
+static u8 fan_control_resume_level;
static int fan_watchdog_maxinterval;
static struct mutex fan_mutex;
@@ -5440,8 +5441,8 @@ static int fan_set_level(int level)
case TPACPI_FAN_WR_ACPI_FANS:
case TPACPI_FAN_WR_TPEC:
- if ((level != TP_EC_FAN_AUTO) &&
- (level != TP_EC_FAN_FULLSPEED) &&
+ if (!(level & TP_EC_FAN_AUTO) &&
+ !(level & TP_EC_FAN_FULLSPEED) &&
((level < 0) || (level > 7)))
return -EINVAL;
@@ -6005,38 +6006,67 @@ static void fan_exit(void)
static void fan_suspend(pm_message_t state)
{
+ int rc;
+
if (!fan_control_allowed)
return;
/* Store fan status in cache */
- fan_get_status_safe(NULL);
+ fan_control_resume_level = 0;
+ rc = fan_get_status_safe(&fan_control_resume_level);
+ if (rc < 0)
+ printk(TPACPI_NOTICE
+ "failed to read fan level for later "
+ "restore during resume: %d\n", rc);
+
+ /* if it is undefined, don't attempt to restore it.
+ * KEEP THIS LAST */
if (tp_features.fan_ctrl_status_undef)
- fan_control_desired_level = TP_EC_FAN_AUTO;
+ fan_control_resume_level = 0;
}
static void fan_resume(void)
{
- u8 saved_fan_level;
u8 current_level = 7;
bool do_set = false;
+ int rc;
/* DSDT *always* updates status on resume */
tp_features.fan_ctrl_status_undef = 0;
- saved_fan_level = fan_control_desired_level;
if (!fan_control_allowed ||
+ !fan_control_resume_level ||
(fan_get_status_safe(&current_level) < 0))
return;
switch (fan_control_access_mode) {
case TPACPI_FAN_WR_ACPI_SFAN:
- do_set = (saved_fan_level > current_level);
+ /* never decrease fan level */
+ do_set = (fan_control_resume_level > current_level);
break;
case TPACPI_FAN_WR_ACPI_FANS:
case TPACPI_FAN_WR_TPEC:
- do_set = ((saved_fan_level & TP_EC_FAN_FULLSPEED) ||
- (saved_fan_level == 7 &&
- !(current_level & TP_EC_FAN_FULLSPEED)));
+ /* never decrease fan level, scale is:
+ * TP_EC_FAN_FULLSPEED > 7 >= TP_EC_FAN_AUTO
+ *
+ * We expect the firmware to set either 7 or AUTO, but we
+ * handle FULLSPEED out of paranoia.
+ *
+ * So, we can safely only restore FULLSPEED or 7, anything
+ * else could slow the fan. Restoring AUTO is useless, at
+ * best that's exactly what the DSDT already set (it is the
+ * slower it uses).
+ *
+ * Always keep in mind that the DSDT *will* have set the
+ * fans to what the vendor supposes is the best level. We
+ * muck with it only to speed the fan up.
+ */
+ if (fan_control_resume_level != 7 &&
+ !(fan_control_resume_level & TP_EC_FAN_FULLSPEED))
+ return;
+ else
+ do_set = !(current_level & TP_EC_FAN_FULLSPEED) &&
+ (current_level != fan_control_resume_level);
break;
default:
return;
@@ -6044,8 +6074,11 @@ static void fan_resume(void)
if (do_set) {
printk(TPACPI_NOTICE
"restoring fan level to 0x%02x\n",
- saved_fan_level);
- fan_set_level_safe(saved_fan_level);
+ fan_control_resume_level);
+ rc = fan_set_level_safe(fan_control_resume_level);
+ if (rc < 0)
+ printk(TPACPI_NOTICE
+ "failed to restore fan level: %d\n", rc);
}
}