If a particular SMM call takes a very long time to execute,
the user might experience audio problems. Print a warning
if a particular SMM call took over 0.250 seconds to execute,
so the user can check whether or not possible audio problems
are caused by this driver.
Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
---
drivers/hwmon/dell-smm-hwmon.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index f13902414615..b960330eaded 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -49,6 +49,9 @@
#define I8K_SMM_GET_DELL_SIG1 0xfea3
#define I8K_SMM_GET_DELL_SIG2 0xffa3
+/* in usecs */
+#define DELL_SMM_MAX_DURATION 250000
+
#define I8K_FAN_MULT 30
#define I8K_FAN_RPM_THRESHOLD 1000
#define I8K_MAX_TEMP 127
@@ -239,6 +242,9 @@ static int i8k_smm_func(void *par)
pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lld usecs)\n", eax, ebx,
(rc ? 0xffff : regs->eax & 0xffff), duration);
+ if (duration > DELL_SMM_MAX_DURATION)
+ pr_warn("SMM call took %lld usecs!\n", duration);
+
return rc;
}
--
2.30.2
