[PATCH 3/6] acpi: s3: force enable /sys/power/pm_debug_messages (LP: #1772563)

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

Some kernels may not have this set to 1 to get PM debug messages
for the S3 cycle, so force enable it on and then restore it back
after the test.

Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 src/acpi/s3/s3.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/acpi/s3/s3.c b/src/acpi/s3/s3.c
index c2d0b0f1..e27fb2df 100644
--- a/src/acpi/s3/s3.c
+++ b/src/acpi/s3/s3.c
@@ -493,6 +493,7 @@ static int s3_test_multiple(fwts_framework *fw)
 	int resume_too_long = 0;
 	int awake_delay = s3_min_delay * 1000;
 	int delta = (int)(s3_delay_delta * 1000.0);
+	int pm_debug;
 
 #if FWTS_ENABLE_LOGIND
 #if !GLIB_CHECK_VERSION(2,35,0)
@@ -501,6 +502,9 @@ static int s3_test_multiple(fwts_framework *fw)
 #endif
 #endif
 
+	(void)fwts_pm_debug_get(&pm_debug);
+	(void)fwts_pm_debug_set(1);
+
 	if (s3_multiple == 1)
 		fwts_log_info(fw, "Defaulted to 1 test, use --s3-multiple=N to run more S3 cycles\n");
 
@@ -559,6 +563,10 @@ static int s3_test_multiple(fwts_framework *fw)
 		}
 	}
 
+	/* Restore pm debug value */
+	if (pm_debug != -1)
+		(void)fwts_pm_debug_set(pm_debug);
+
 	fwts_log_info(fw, "Completed S3 cycle(s)\n");
 
 	if (klog_errors > 0)
-- 
2.17.0