[igt-dev] [PATCH] [intel-gfx] [PATCH i-g-t] tests/pm_backlight.c : Brightness test with DPMS and System suspend.

[Jyoti Yadav]

From: Jyoti <jyoti.r.yadav at intel.com>

BIOS programs few of PWM related registers during initial boot.
But during System suspend those registers are cleared.
This test aim to check whether display programs those registers properly after
system resume.
Also checks brightness programming during DPMS ON/OFF cycle to check backlight
programming is done properly from display side.

Signed-off-by: Jyoti Yadav <jyoti.r.yadav at intel.com>
---
 tests/pm_backlight.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/tests/pm_backlight.c b/tests/pm_backlight.c
index a695f90..6f6d727 100644
--- a/tests/pm_backlight.c
+++ b/tests/pm_backlight.c
@@ -47,6 +47,7 @@ struct context {
 #define FADESPEED 100 /* milliseconds between steps */
 
 IGT_TEST_DESCRIPTION("Basic backlight sysfs test");
+static int8_t *pm_data = NULL;
 
 static int backlight_read(int *result, const char *fname)
 {
@@ -150,19 +151,60 @@ static void test_fade(struct context *context)
 		nanosleep(&ts, NULL);
 	}
 }
+static void test_fade_with_dpms(struct context *context, igt_output_t *output)
+{
+	int i;
+	static const struct timespec ts = { .tv_sec = 0, .tv_nsec = FADESPEED*1000000 };
+	bool has_runtime_pm;
+	has_runtime_pm = igt_setup_runtime_pm();
+	igt_info("Runtime PM support: %d\n", has_runtime_pm);
+	igt_assert(has_runtime_pm);
+	kmstest_set_connector_dpms(output->display->drm_fd, output->config.connector, DRM_MODE_DPMS_OFF);
+	igt_assert(igt_wait_for_pm_status(IGT_RUNTIME_PM_STATUS_SUSPENDED));
+	kmstest_set_connector_dpms(output->display->drm_fd, output->config.connector, DRM_MODE_DPMS_ON);
+	igt_assert(igt_wait_for_pm_status(IGT_RUNTIME_PM_STATUS_ACTIVE));
+
+	/* Fade out, then in */
+	for (i = context->max; i > 0; i -= context->max / FADESTEPS) {
+		test_and_verify(context, i);
+		nanosleep(&ts, NULL);
+	}
+	for (i = 0; i <= context->max; i += context->max / FADESTEPS) {
+		test_and_verify(context, i);
+		nanosleep(&ts, NULL);
+	}
+}
+static void test_fade_with_suspend(struct context *context, igt_output_t *output)
+{
+	int i;
+	static const struct timespec ts = { .tv_sec = 0, .tv_nsec = FADESPEED*1000000 };
+	kmstest_set_connector_dpms(output->display->drm_fd, output->config.connector, DRM_MODE_DPMS_OFF);
+	igt_assert(igt_wait_for_pm_status(IGT_RUNTIME_PM_STATUS_SUSPENDED));
+	igt_system_suspend_autoresume(SUSPEND_STATE_MEM, SUSPEND_TEST_NONE);
+
+	/* Fade out, then in */
+	for (i = context->max; i > 0; i -= context->max / FADESTEPS) {
+		test_and_verify(context, i);
+		nanosleep(&ts, NULL);
+	}
+	for (i = 0; i <= context->max; i += context->max / FADESTEPS) {
+		test_and_verify(context, i);
+		nanosleep(&ts, NULL);
+	}
+}
 
 igt_main
 {
 	struct context context = {0};
 	int old;
 	igt_display_t display;
+	igt_output_t *output;
 	struct igt_fb fb;
 
 	igt_skip_on_simulation();
 
 	igt_fixture {
 		enum pipe pipe;
-		igt_output_t *output;
 		bool found = false;
 		char full_name[32] = {};
 		char *name;
@@ -187,7 +229,6 @@ igt_main
 		for_each_pipe_with_valid_output(&display, pipe, output) {
 			if (strcmp(name + 6, output->name))
 				continue;
-
 			found = true;
 			break;
 		}
@@ -205,6 +246,7 @@ igt_main
 		igt_plane_set_fb(primary, &fb);
 
 		igt_display_commit2(&display, display.is_atomic ? COMMIT_ATOMIC : COMMIT_LEGACY);
+		pm_data = igt_pm_enable_sata_link_power_management();
 	}
 
 	igt_subtest("basic-brightness")
@@ -213,6 +255,10 @@ igt_main
 		test_bad_brightness(&context);
 	igt_subtest("fade")
 		test_fade(&context);
+	igt_subtest("fade_with_dpms")
+		test_fade_with_dpms(&context, output);
+	igt_subtest("fade_with_suspend")
+		test_fade_with_suspend(&context, output);
 
 	igt_fixture {
 		/* Restore old brightness */
@@ -220,6 +266,8 @@ igt_main
 
 		igt_display_fini(&display);
 		igt_remove_fb(display.drm_fd, &fb);
+		igt_pm_restore_sata_link_power_management(pm_data);
+		free(pm_data);
 		close(display.drm_fd);
 	}
 }
-- 
1.9.1