[PATCH i-g-t v5 3/4] tests/intel/kms_pm_dc: Update test duration to 4 seconds

[Naladala Ramanaidu <ramanaidu.naladala@intel.com>]

Extend the test time to account for features causing
delayed C10 state entry. Considering CI execution time, we have
set the sequence to 4 seconds. For the first 2-3 seconds, we run
at the maximum refresh rate and then change the refresh rate to
emulate extended vblank for the remaining 4 seconds.

v2: Split the patch into two. (Kamil)
v3: Declare variable in new line. (Suraj)
v4: Fix magic number. (suraj)

Signed-off-by: Naladala Ramanaidu <ramanaidu.naladala@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
---
 tests/intel/kms_pm_dc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/intel/kms_pm_dc.c b/tests/intel/kms_pm_dc.c
index b9bee3523..a69876fc7 100644
--- a/tests/intel/kms_pm_dc.c
+++ b/tests/intel/kms_pm_dc.c
@@ -593,7 +593,9 @@ static unsigned int read_pkgc_counter(int debugfs_root_fd)
 static void test_deep_pkgc_state(data_t *data)
 {
 	unsigned int pre_val = 0, cur_val = 0;
-	time_t start = time(NULL), duration = 2, delay;
+	time_t start = time(NULL);
+	time_t duration = (4 * SEC);
+	time_t delay;
 	enum pipe pipe;
 	bool pkgc_flag = false;
 	bool flip = true;
-- 
2.43.0