[PATCH 5/6] acpi: s4: 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 S4 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/s4/s4.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/acpi/s4/s4.c b/src/acpi/s4/s4.c
index cf72851a..2e458d3e 100644
--- a/src/acpi/s4/s4.c
+++ b/src/acpi/s4/s4.c
@@ -365,6 +365,7 @@ static int s4_test_multiple(fwts_framework *fw)
 	int delta = (int)(s4_delay_delta * 1000.0);
 	int tracing_buffer_size = -1;
 	int ret = FWTS_OK;
+	int pm_debug;
 	bool retried = false;
 
 #if FWTS_ENABLE_LOGIND
@@ -374,6 +375,9 @@ static int s4_test_multiple(fwts_framework *fw)
 #endif
 #endif
 
+	(void)fwts_pm_debug_get(&pm_debug);
+	(void)fwts_pm_debug_set(1);
+
         if (s4_multiple == 1)
                 fwts_log_info(fw, "Defaulted to run 1 test, run --s4-multiple=N to run more S4 cycles\n");
 
@@ -450,6 +454,10 @@ static int s4_test_multiple(fwts_framework *fw)
 		}
 	}
 
+	/* Restore pm debug value */
+	if (pm_debug != -1)
+		(void)fwts_pm_debug_set(pm_debug);
+
 	if (tracing_buffer_size > 0) {
 		char tmp[32];
 
-- 
2.17.0