[v3] Idleness DRRS test

Commit Message

Ankit Nautiyal Oct. 21, 2016, 3:52 a.m. UTC

From: Ramalingam C <[e-mail]>

Idleness DRRS:
	By default the DRRS state will be at DRRS_HIGH_RR. When a Display
	content is Idle for more than 1Sec Idleness will be declared and
	DRRS_LOW_RR will be invoked, changing the refresh rate to the
	lower most refresh rate supported by the panel. As soon as there
	is a display content change there will be a DRRS state transition
	as DRRS_LOW_RR--> DRRS_HIGH_RR, changing the refresh rate to the
	highest refresh rate supported by the panel.

To test this, Idleness DRRS IGT will probe the DRRS state at below
instances and compare with the expected state.

	Instance					Expected State
1. Immediately after rendering the still image		DRRS_HIGH_RR
2. After a delay of 1.2Sec				DRRS_LOW_RR
3. After changing the frame buffer			DRRS_HIGH_RR
4. After a delay of 1.2Sec				DRRS_LOW_RR
5. After changing the frame buffer			DRRS_HIGH_RR
6. After a delay of 1.2Sec				DRRS_LOW_RR

The test checks the driver DRRS state from the debugfs entry. To check the
actual refresh-rate, a separate thread counts the number of vblanks
received per sec. The refresh-rate calculated is checked against the
expected refresh-rate with a tolerance value of 2.

This patch is a continuation of the earlier work
https://patchwork.freedesktop.org/patch/45472/ towards igt for idleness

DRRS. The code is tested on Broxton BXT_T platform.

v2: Addressed the comments and suggestions from Vlad, Marius.
The signoff details from the earlier work are also included.

v3: Modified vblank rate calculation by using reply-sequence, provided by
drmWaitVBlank, as suggested by Chris Wilson.

Signed-off-by: Ramalingam C <[e-mail]>
Signed-off-by: Vandana Kannan <[e-mail]>
Signed-off-by: aknautiy <[e-mail]>
---
 tests/Makefile.sources |   1 +
 tests/kms_drrs.c       | 599 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 600 insertions(+)
 create mode 100644 tests/kms_drrs.c

Comments

Petri Latvala Nov. 14, 2016, 12:44 p.m. UTC | #1

Chris, happy with this revision?


On Fri, Oct 21, 2016 at 09:22:13AM +0530, Nautiyal Ankit wrote:
> From: Ramalingam C <[e-mail]>
> 
> Idleness DRRS:
> 	By default the DRRS state will be at DRRS_HIGH_RR. When a Display
> 	content is Idle for more than 1Sec Idleness will be declared and
> 	DRRS_LOW_RR will be invoked, changing the refresh rate to the
> 	lower most refresh rate supported by the panel. As soon as there
> 	is a display content change there will be a DRRS state transition
> 	as DRRS_LOW_RR--> DRRS_HIGH_RR, changing the refresh rate to the
> 	highest refresh rate supported by the panel.
> 
> To test this, Idleness DRRS IGT will probe the DRRS state at below
> instances and compare with the expected state.
> 
> 	Instance					Expected State
> 1. Immediately after rendering the still image		DRRS_HIGH_RR
> 2. After a delay of 1.2Sec				DRRS_LOW_RR
> 3. After changing the frame buffer			DRRS_HIGH_RR
> 4. After a delay of 1.2Sec				DRRS_LOW_RR
> 5. After changing the frame buffer			DRRS_HIGH_RR
> 6. After a delay of 1.2Sec				DRRS_LOW_RR
> 
> The test checks the driver DRRS state from the debugfs entry. To check the
> actual refresh-rate, a separate thread counts the number of vblanks
> received per sec. The refresh-rate calculated is checked against the
> expected refresh-rate with a tolerance value of 2.
> 
> This patch is a continuation of the earlier work
> https://patchwork.freedesktop.org/patch/45472/ towards igt for idleness
> 
> DRRS. The code is tested on Broxton BXT_T platform.
> 
> v2: Addressed the comments and suggestions from Vlad, Marius.
> The signoff details from the earlier work are also included.
> 
> v3: Modified vblank rate calculation by using reply-sequence, provided by
> drmWaitVBlank, as suggested by Chris Wilson.
> 
> Signed-off-by: Ramalingam C <[e-mail]>
> Signed-off-by: Vandana Kannan <[e-mail]>
> Signed-off-by: aknautiy <[e-mail]>
> ---
>  tests/Makefile.sources |   1 +
>  tests/kms_drrs.c       | 599 +++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 600 insertions(+)
>  create mode 100644 tests/kms_drrs.c
> 
> diff --git a/tests/Makefile.sources b/tests/Makefile.sources
> index a837977..5f31521 100644
> --- a/tests/Makefile.sources
> +++ b/tests/Makefile.sources
> @@ -91,6 +91,7 @@ TESTS_progs_M = \
>  	kms_cursor_crc \
>  	kms_cursor_legacy \
>  	kms_draw_crc \
> +	kms_drrs \
>  	kms_fbc_crc \
>  	kms_fbcon_fbt \
>  	kms_flip \
> diff --git a/tests/kms_drrs.c b/tests/kms_drrs.c
> new file mode 100644
> index 0000000..bd5a135
> --- /dev/null
> +++ b/tests/kms_drrs.c
> @@ -0,0 +1,599 @@
> +/*
> + * Copyright © 2016 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + *
> + */
> +
> +#include "drmtest.h"
> +#include "igt_debugfs.h"
> +#include "igt_kms.h"
> +#include "intel_chipset.h"
> +#include "intel_batchbuffer.h"
> +#include "ioctl_wrappers.h"
> +#include <time.h>
> +#include <pthread.h>
> +#include <stdlib.h>
> +#include <sys/time.h>
> +IGT_TEST_DESCRIPTION(
> +"Performs write operations and then waits for DRRS to invoke the"
> +"Low Refresh Rate and then disturbs the contents of the screen once"
> +"again hence DRRS revert back to High Refresh Rate(Default).");
> +
> +#define DRRS_STATUS_BYTES_CNT	1000
> +#define SET	1
> +#define RESET	0
> +
> +/*
> + * Structure to store data to create 2 framebuffers, fb[0] and fb[1] on a given
> + * display. To disturb the content of the screen, we replace fb[0] by fb[1] and
> + * vice versa.
> + */
> +typedef struct {
> +	int drm_fd;
> +	uint32_t devid;
> +	uint32_t handle[2];
> +	igt_display_t display;
> +	igt_output_t *output;
> +	enum pipe pipe;
> +	igt_plane_t *primary;
> +	struct igt_fb fb[2];
> +	uint32_t fb_id[2];
> +} data_t;
> +
> +/*
> + * Structure to count vblank and note the starting time of the counter
> + */
> +typedef struct {
> +	unsigned int vbl_count;
> +	struct timeval start;
> +} vbl_info;
> +
> +/*
> + * Condition variables,mutex, and shared variables for thread synchronization
> + */
> +pthread_mutex_t rr_mutex;
> +pthread_cond_t cv_rr_calc_requested;
> +pthread_cond_t cv_rr_calc_completed;
> +int rr_calc_requested = RESET;
> +int rr_calc_completed = RESET;
> +int thread_flag = SET;
> +int refresh_rate_shared = -1;
> +
> +/*
> + * Structure for refresh rate type
> + */
> +typedef struct{
> +	int rate;
> +	const char *name;
> +} refresh_rate_t;
> +
> +static inline uint32_t pipe_select(int pipe)
> +{
> +	if (pipe > 1)
> +		return pipe << DRM_VBLANK_HIGH_CRTC_SHIFT;
> +	else if (pipe > 0)
> +		return DRM_VBLANK_SECONDARY;
> +	else
> +		return 0;
> +}
> +
> +/*
> + * igt_millisec_elapsed:
> + *	Calculates the no. of millisec elapsed since timeval start
> + */
> +static double igt_millisec_elapsed(const struct timeval *start)
> +{
> +	struct timeval curr;
> +	double res;
> +
> +	gettimeofday(&curr, NULL);
> +	return (1e6*(curr.tv_sec - start->tv_sec) +
> +				(curr.tv_usec - start->tv_usec)/1000.00);
> +}
> +
> +/*
> + * read_drrs_status :
> + *	Func to read the DRRS status from debugfs
> + */
> +static bool read_drrs_status(char *str)
> +{
> +	FILE *status;
> +	int cnt;
> +
> +	status = igt_debugfs_fopen("i915_drrs_status", "r");
> +	igt_assert(status);
> +
> +	cnt = fread(str, DRRS_STATUS_BYTES_CNT - 1, 1, status);
> +	if (!cnt) {
> +		if (!feof(status)) {
> +			igt_info("ERROR: %d at fread\n", ferror(status));
> +			return false;
> +		}
> +		clearerr(status);
> +	}
> +	fclose(status);
> +	return true;
> +}
> +
> +/*
> + * is_drrs_supported :
> + *	Func to check for DRRS support
> + */
> +static bool is_drrs_supported(void)
> +{
> +	char str[DRRS_STATUS_BYTES_CNT] = {};
> +
> +	if (!read_drrs_status(str)) {
> +		igt_info("ERROR: Debugfs read FAILED\n");
> +		return false;
> +	}
> +	return strstr(str, "DRRS Supported: Yes") != NULL;
> +}
> +
> +/*
> + * is_drrs_enabled :
> + *	Func to check if DRRS is enabled by driver
> + */
> +static bool is_drrs_enabled(void)
> +{
> +	char str[DRRS_STATUS_BYTES_CNT] = {};
> +
> +	if (!read_drrs_status(str)) {
> +		igt_info("ERROR: Debugfs read FAILED\n");
> +		return false;
> +	}
> +	return strstr(str, "Idleness DRRS: Disabled") == NULL;
> +}
> +
> +/*
> + * prepare_crtc :
> + *	Func to prepare crtc for the given display
> + */
> +static bool prepare_crtc(data_t *data)
> +{
> +	if (data == NULL)
> +		return false;
> +
> +	igt_display_t *display = &data->display;
> +	igt_output_t *output = data->output;
> +
> +	/* select the pipe we want to use */
> +	igt_output_set_pipe(output, data->pipe);
> +	igt_display_commit(display);
> +
> +	if (!output->valid) {
> +		igt_output_set_pipe(output, PIPE_ANY);
> +		igt_display_commit(display);
> +		return false;
> +	}
> +
> +	return true;
> +}
> +/*
> + * vbl_rate :
> + *	calculates the vblank rate by counting vblanks between start and end
> + *	period, divided by time between start and end.
> + */
> +static double vbl_rate(const union drm_wait_vblank *start,
> +				const union drm_wait_vblank *end) {
> +	double s, e;
> +
> +	s = start->reply.tval_sec + 1e-6 * start->reply.tval_usec;
> +	e = end->reply.tval_sec + 1e-6 * end->reply.tval_usec;
> +	return ((end->reply.sequence - start->reply.sequence) / (e - s));
> +}
> +
> +/*
> + * calculate_refresh_rate :
> + *	Func to calculate the refresh rate by counting
> + *	vblanks in 1 sec (1000 ms). It returns the calculated refresh rate on
> + *	success. Returns -1 in case of error.
> + */
> +int calculate_refresh_rate(data_t *data)
> +{
> +#define PERIOD_MS 1000
> +	union drm_wait_vblank start, end;
> +	struct timeval start_tv;
> +
> +	memset(&start, 0, sizeof(start));
> +	start.request.type = DRM_VBLANK_RELATIVE | pipe_select(data->pipe);
> +	if (drmWaitVBlank(data->drm_fd, &start) != 0) {
> +		igt_info("ERROR : drmWaitVBlank Failed!\n");
> +		return -1;
> +	}
> +	gettimeofday(&start_tv, NULL);
> +	while (igt_millisec_elapsed(&start_tv) < PERIOD_MS) {
> +		memset(&end, 0, sizeof(end));
> +		end.request.type = DRM_VBLANK_RELATIVE |
> +						pipe_select(data->pipe);
> +		end.request.sequence = 1;
> +		if (drmWaitVBlank(data->drm_fd, &end) != 0) {
> +			igt_info("ERROR : drmWaitVBlank Failed!\n");
> +			return -1;
> +		}
> +	}
> +	return vbl_rate(&start, &end);
> +}
> +
> +/*
> + * worker_thread_func :
> + *	Func which is run by a worker thread to calculate the refresh_rate,
> + *	when signalled by the master thread.
> + */
> +void *worker_thread_func(void *ptr)
> +{
> +	data_t *data = (data_t *) ptr;
> +
> +	while (1) {
> +		int refresh_rate = 0;
> +		/*wait for signal from master*/
> +		pthread_mutex_lock(&rr_mutex);
> +		while (!rr_calc_requested)
> +			pthread_cond_wait(&cv_rr_calc_requested, &rr_mutex);
> +
> +		/* checkpoint for thread termination */
> +		if (thread_flag == RESET) {
> +			pthread_mutex_unlock(&rr_mutex);
> +			pthread_exit(NULL);
> +		}
> +		rr_calc_requested = RESET;
> +		pthread_mutex_unlock(&rr_mutex);
> +		/*calculate refresh_rate*/
> +		refresh_rate = calculate_refresh_rate(data);
> +
> +		/* signal the master */
> +		pthread_mutex_lock(&rr_mutex);
> +		refresh_rate_shared = refresh_rate;
> +		rr_calc_completed = SET;
> +		pthread_mutex_unlock(&rr_mutex);
> +		pthread_cond_signal(&cv_rr_calc_completed);
> +	}
> +	return NULL;
> +}
> +
> +/*
> + * check_refresh_rate :
> + *	Func to check the refresh rate calculated, against the expected refresh
> + *	rate. It signals the worker thread to calculate the refresh-
> + *	rate, and checks if the correct refresh rate is switched.
> + *	Returns 0 in case of pass , 1 in case of failure, and -1 for error.
> + */
> +
> +static int check_refresh_rate(data_t *data, refresh_rate_t *expected_rr)
> +{
> +/*
> + * The calculated refresh-rate is an approximation to estimated refresh-rate.
> + * The tolerance threshold for the difference is set to 2. Difference more than
> + * 2 is considered as failure for the check_refresh_rate.
> + */
> +#define TOLERANCE_THRESHOLD		2
> +	int refresh_rate = -1;
> +	char drrs_status[DRRS_STATUS_BYTES_CNT] = {};
> +
> +	/* Signal worker thread to calculate refresh rate */
> +	pthread_mutex_lock(&rr_mutex);
> +	rr_calc_requested = SET;
> +	pthread_mutex_unlock(&rr_mutex);
> +	pthread_cond_signal(&cv_rr_calc_requested);
> +
> +	/* Get the DRRS Status from the debugfs entry */
> +	if (!read_drrs_status(drrs_status)) {
> +		igt_info("ERROR : DRRS debugfs read FAILED\n");
> +		return -1;
> +	}
> +	/* Wait for the refresh rate calculator thread */
> +	pthread_mutex_lock(&rr_mutex);
> +	while (!rr_calc_completed)
> +		pthread_cond_wait(&cv_rr_calc_completed, &rr_mutex);
> +	rr_calc_completed = RESET;
> +	refresh_rate = refresh_rate_shared;
> +	pthread_mutex_unlock(&rr_mutex);
> +	if (refresh_rate < 0) {
> +		igt_info("ERROR : Refresh rate calculation FAILED\n");
> +		return -1;
> +	}
> +	igt_info("INFO : Actual Refresh_rate based on Vblank Counts/sec = %d\n"
> +							, refresh_rate);
> +
> +	/* Compare with Expected Refresh Rate*/
> +	igt_info("INFO: Expected Refresh-Rate %d\n", expected_rr->rate);
> +	if (strstr(drrs_status, expected_rr->name) != NULL
> +	&& abs(refresh_rate - expected_rr->rate) <= TOLERANCE_THRESHOLD) {
> +		igt_info("INFO: Expected %s : PASSED\n", expected_rr->name);
> +		return 0;
> +	}
> +
> +	igt_info("INFO : Expected %s : FAILED.\n", expected_rr->name);
> +	return 1;
> +}
> +
> +/*
> + * clean_up :
> + *	Func to stop the worker thread and destroy thread syncronization
> + *	structures.
> + */
> +void clean_up(pthread_t rr_thread)
> +{
> +	/* Stop the worker thread */
> +	pthread_mutex_lock(&rr_mutex);
> +	thread_flag = RESET;
> +	rr_calc_requested = SET;
> +	pthread_mutex_unlock(&rr_mutex);
> +	pthread_cond_signal(&cv_rr_calc_requested);
> +	pthread_join(rr_thread, NULL);
> +
> +	/* destroy the condition variables and mutex */
> +	pthread_cond_destroy(&cv_rr_calc_requested);
> +	pthread_cond_destroy(&cv_rr_calc_completed);
> +	pthread_mutex_destroy(&rr_mutex);
> +}
> +
> +/*
> + * execute_test:
> + *	This function
> + *	1. Initializes the thread sync structures.
> + *	2. Creates a worker thread which can be signaled to estimate
> + *	the refresh rates based on counting vblanks per sec.
> + *	3. Creates two different Framebuffer fb0, fb1
> + *	and apply them in the interval of 1.2Sec. So between FB change
> + *	DRRS should toggle from DRRS_HIGH_RR -> DRRS_LOW_RR.
> + *	And on next FB change DRRS_LOW_RR -> DRRS_HIGH_RR.
> + *
> + *	These expected transitions are verified using the kernel debugfs
> + *	and the refresh-rate, calculated by counting vblanks per sec by the
> + *	worker thread.
> + */
> +static int execute_test(data_t *data)
> +{
> +	igt_display_t *display = &data->display;
> +	igt_output_t *output = data->output;
> +	drmModeModeInfo *mode, *supported_modes;
> +	int test_failed = 0;
> +	int ret, i, count_modes;
> +	refresh_rate_t high_rr, low_rr;
> +	pthread_t rr_thread;
> +
> +	/*initialize the condition variables and  mutex*/
> +	pthread_cond_init(&cv_rr_calc_requested, NULL);
> +	pthread_cond_init(&cv_rr_calc_completed, NULL);
> +	pthread_mutex_init(&rr_mutex, NULL);
> +	thread_flag = SET;
> +	rr_calc_requested = RESET;
> +	rr_calc_completed = RESET;
> +	/* create a thread for calculating the refresh rate */
> +	ret = pthread_create(&rr_thread, NULL, worker_thread_func,
> +							(void *) data);
> +	if (ret == -1) {
> +		igt_info("ERROR : Refresh rate thread creation FAILED\n");
> +		clean_up(rr_thread);
> +		return -1;
> +	}
> +
> +	high_rr.name = "DRRS_HIGH_RR";
> +	high_rr.rate = 0;
> +	low_rr.name = "DRRS_LOW_RR";
> +	low_rr.rate = 0;
> +	/* get the max and min supported refresh rates for the display */
> +	supported_modes = output->config.connector->modes;
> +	count_modes = output->config.connector->count_modes;
> +	/* minimum 2 modes are required for DRRS */
> +	if (count_modes < 2) {
> +		igt_info("ERROR: Minimum 2 modes required for DRRS\n");
> +		return -1;
> +	}
> +	for (i = 0; i < count_modes; i++) {
> +		int rr = supported_modes[i].vrefresh;
> +
> +		if (i == 0) {
> +			high_rr.rate = low_rr.rate = rr;
> +			continue;
> +		}
> +		if (high_rr.rate < rr)
> +			high_rr.rate = rr;
> +		if (low_rr.rate > rr)
> +			low_rr.rate = rr;
> +	}
> +	data->primary = igt_output_get_plane(data->output, IGT_PLANE_PRIMARY);
> +	mode = igt_output_get_mode(data->output);
> +	data->fb_id[0] = igt_create_color_fb(data->drm_fd, mode->hdisplay,
> +			mode->vdisplay,
> +			DRM_FORMAT_XRGB8888,
> +			LOCAL_DRM_FORMAT_MOD_NONE,
> +			0.0, 100.1, 0.0, &data->fb[0]);
> +	igt_assert(data->fb_id[0]);
> +	data->fb_id[1] = igt_create_color_fb(data->drm_fd, mode->hdisplay,
> +			mode->vdisplay,
> +			DRM_FORMAT_XRGB8888,
> +			LOCAL_DRM_FORMAT_MOD_NONE,
> +			100.1, 0.0, 0.0,
> +			&data->fb[1]);
> +	igt_assert(data->fb_id[1]);
> +
> +	data->handle[0] = data->fb[0].gem_handle;
> +	data->handle[1] = data->fb[1].gem_handle;
> +
> +	/* scanout = fb[1] */
> +	igt_plane_set_fb(data->primary, &data->fb[1]);
> +	igt_display_commit(display);
> +	if (!is_drrs_enabled()) {
> +		igt_info("INFO : DRRS not enabled\n");
> +		igt_plane_set_fb(data->primary, NULL);
> +		igt_output_set_pipe(output, PIPE_ANY);
> +		igt_display_commit(display);
> +		igt_remove_fb(data->drm_fd, &data->fb[0]);
> +		igt_remove_fb(data->drm_fd, &data->fb[1]);
> +		clean_up(rr_thread);
> +		return -1;
> +	}
> +
> +	/* expecting High RR */
> +	ret =  check_refresh_rate(data, &high_rr);
> +	if (ret == -1)
> +		return -1;
> +	if (ret == 1)
> +		test_failed = 1;
> +	/* 1.2Sec to Enter the Idleness and check for Low Refresh Rate */
> +	usleep(1200000);
> +	ret =  check_refresh_rate(data, &low_rr);
> +	if (ret == -1)
> +		return -1;
> +	if (ret == 1)
> +		test_failed = 1;
> +
> +	/* scanout = fb[0] and check for High Refresh Rate*/
> +	igt_plane_set_fb(data->primary, &data->fb[0]);
> +	igt_display_commit(display);
> +	ret =  check_refresh_rate(data, &high_rr);
> +	if (ret == -1)
> +		return -1;
> +	if (ret == 1)
> +		test_failed = 1;
> +
> +	/* 1.2Sec to Enter the Idleness and check for Low Refresh Rate */
> +	usleep(1200000);
> +	ret =  check_refresh_rate(data, &low_rr);
> +	if (ret == -1)
> +		return -1;
> +	if (ret == 1)
> +		test_failed = 1;
> +
> +	/* scanout = fb[1] and check for High Refresh Rate*/
> +	igt_plane_set_fb(data->primary, &data->fb[1]);
> +	igt_display_commit(display);
> +	ret =  check_refresh_rate(data, &high_rr);
> +	if (ret == -1)
> +		return -1;
> +	if (ret == 1)
> +		test_failed = 1;
> +
> +	/* 1.2Sec to Enter the Idleness */
> +	usleep(1200000);
> +	ret =  check_refresh_rate(data, &low_rr);
> +	if (ret == -1)
> +		return -1;
> +	if (ret == 1)
> +		test_failed = 1;
> +
> +	clean_up(rr_thread);
> +	return test_failed;
> +}
> +
> +/*
> + * finish_crtc :
> + *	Func to free the framebuffers after the test completion.
> + */
> +static void finish_crtc(data_t *data)
> +{
> +	igt_plane_set_fb(data->primary, NULL);
> +	igt_output_set_pipe(data->output, PIPE_ANY);
> +	igt_display_commit(&data->display);
> +
> +	igt_remove_fb(data->drm_fd, &data->fb[0]);
> +	igt_remove_fb(data->drm_fd, &data->fb[1]);
> +}
> +
> +/*
> + * reset_display :
> + *	Func to reset the display structures after the test completion.
> + */
> +static void reset_display(data_t *data)
> +{
> +	igt_display_t *display = &data->display;
> +
> +	for_each_connected_output(display, data->output) {
> +		if (data->output->valid) {
> +			data->primary =  igt_output_get_plane(data->output,
> +							IGT_PLANE_PRIMARY);
> +			igt_plane_set_fb(data->primary, NULL);
> +		}
> +		igt_output_set_pipe(data->output, PIPE_ANY);
> +	}
> +}
> +/*
> + * run_test :
> + *	Func to run the test for the eDP display.
> + */
> +static void run_test(data_t *data)
> +{
> +	igt_display_t *display = &data->display;
> +	int ret;
> +
> +	reset_display(data);
> +	/* Check for eDP Connector on PIPE A ,as eDP goes normally on PIPE_A */
> +	for_each_connected_output(display, data->output) {
> +		drmModeConnectorPtr c = data->output->config.connector;
> +
> +		if (c->connector_type != DRM_MODE_CONNECTOR_eDP ||
> +			c->connection != DRM_MODE_CONNECTED)
> +			continue;
> +		data->pipe = PIPE_A;
> +		igt_assert_f(prepare_crtc(data), "Failed to prepare CRTC\n");
> +		igt_info("INFO : Beginning %s on pipe %s,connector %s\n",
> +					igt_test_name(),
> +					kmstest_pipe_name(data->pipe),
> +					igt_output_name(data->output));
> +
> +		ret = execute_test(data);
> +		igt_skip_on_f(ret == -1,
> +				"INFO :%s on pipe %s, connector %s:SKIPPED\n",
> +					igt_test_name(),
> +					kmstest_pipe_name(data->pipe),
> +					igt_output_name(data->output));
> +		igt_fail_on_f(ret == 1,
> +				"INFO :%s on pipe %s, connector %s:FAILED\n",
> +					igt_test_name(),
> +					kmstest_pipe_name(data->pipe),
> +					igt_output_name(data->output));
> +
> +		igt_assert_f(ret == 0,
> +				"INFO :%s on pipe %s, connector %s: PASSED\n",
> +					igt_test_name(),
> +					kmstest_pipe_name(data->pipe),
> +					igt_output_name(data->output));
> +
> +		finish_crtc(data);
> +	}
> +}
> +
> +igt_simple_main
> +{
> +	data_t data = {};
> +
> +	igt_skip_on_simulation();
> +	data.drm_fd = drm_open_driver_master(DRIVER_INTEL);
> +	if (data.drm_fd == -1) {
> +		igt_info("ERROR : invalid fd\n");
> +		return;
> +	}
> +	data.devid = intel_get_drm_devid(data.drm_fd);
> +	if (data.devid < 0) {
> +		igt_info("ERROR : invalid dev id\n");
> +		return;
> +	}
> +	/* Check if the DRRS is supported.
> +	 * If yes call the Idleness DRRS test
> +	 */
> +	igt_require_f(is_drrs_supported(),
> +			"DRRS not supported:check VBT/panel caps\n");
> +	igt_display_init(&data.display, data.drm_fd);
> +	run_test(&data);
> +	igt_display_fini(&data.display);
> +}
> -- 
> 2.7.4
> 
> _______________________________________________
> Intel-gfx mailing list
> [e-mail]
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Chris Wilson Nov. 14, 2016, 1:06 p.m. UTC | #2

On Mon, Nov 14, 2016 at 02:44:35PM +0200, Petri Latvala wrote:
> Chris, happy with this revision?

Me? No. It still uses a thread instead of events, so I don't think it
qualifies as a good example for anyone else wanting to do the same thing.
Lots of hardcoded expectations (specific sleep patterns, rather than
waiting for the kernel to change with a timeout for failure). It doesn't
check all the possible ways that the output maybe changed (and if they
are irrelevent, that too also needs to be tested to establish expected
behaviour and catch future regressions). Important question, how is
userspace expected to know that the vrefresh changed? How do get around
that userspace is expecting a fixed vblank frequency?
-Chris

Daniel Vetter Nov. 15, 2016, 8:58 a.m. UTC | #3

On Mon, Nov 14, 2016 at 01:06:09PM +0000, Chris Wilson wrote:
> On Mon, Nov 14, 2016 at 02:44:35PM +0200, Petri Latvala wrote:
> > Chris, happy with this revision?
> 
> Me? No. It still uses a thread instead of events, so I don't think it
> qualifies as a good example for anyone else wanting to do the same thing.
> Lots of hardcoded expectations (specific sleep patterns, rather than
> waiting for the kernel to change with a timeout for failure). It doesn't
> check all the possible ways that the output maybe changed (and if they
> are irrelevent, that too also needs to be tested to establish expected
> behaviour and catch future regressions). Important question, how is
> userspace expected to know that the vrefresh changed? How do get around
> that userspace is expecting a fixed vblank frequency?

for display power testing we already have the kms_frontbuffer_tracking
testcase, adding a DRRS variants to that one should resolve all this.

And then kms_drrs would be empty, except when we (if ever) do explicit
drrs through modeset requests. And that would just be checking that the
observed timings match the requested timings.
-Daniel

Ankit Nautiyal Nov. 29, 2016, 9:36 a.m. UTC | #4

As per discussion with Chris, on IRC following were the suggestions :

- Chris has suggested an event based approach to avoid using pthreads.

- Avoid using kernel-specific info like transitional delays and instead 
use either polling or wait-for-event approach. Need to focus on 
user-observable behavior rather than the kernel standpoint.

- Check for transition latency is unnecessary in this test, as this is 
more of a performance/power benchmark.


I will try the event based mechanism to do away with pthreads, and 
incorporate these suggestions in the next patch-set.

-Ankit


On 11/15/2016 2:28 PM, Daniel Vetter wrote:
> On Mon, Nov 14, 2016 at 01:06:09PM +0000, Chris Wilson wrote:
>> On Mon, Nov 14, 2016 at 02:44:35PM +0200, Petri Latvala wrote:
>>> Chris, happy with this revision?
>> Me? No. It still uses a thread instead of events, so I don't think it
>> qualifies as a good example for anyone else wanting to do the same thing.
>> Lots of hardcoded expectations (specific sleep patterns, rather than
>> waiting for the kernel to change with a timeout for failure). It doesn't
>> check all the possible ways that the output maybe changed (and if they
>> are irrelevent, that too also needs to be tested to establish expected
>> behaviour and catch future regressions). Important question, how is
>> userspace expected to know that the vrefresh changed? How do get around
>> that userspace is expecting a fixed vblank frequency?
> for display power testing we already have the kms_frontbuffer_tracking
> testcase, adding a DRRS variants to that one should resolve all this.
>
> And then kms_drrs would be empty, except when we (if ever) do explicit
> drrs through modeset requests. And that would just be checking that the
> observed timings match the requested timings.
> -Daniel

Daniel Vetter Nov. 30, 2016, 9:22 a.m. UTC | #5

On Tue, Nov 29, 2016 at 03:06:17PM +0530, Nautiyal, Ankit K wrote:
> As per discussion with Chris, on IRC following were the suggestions :
> 
> - Chris has suggested an event based approach to avoid using pthreads.
> 
> - Avoid using kernel-specific info like transitional delays and instead use
> either polling or wait-for-event approach. Need to focus on user-observable
> behavior rather than the kernel standpoint.
> 
> - Check for transition latency is unnecessary in this test, as this is more
> of a performance/power benchmark.
> 
> 
> I will try the event based mechanism to do away with pthreads, and
> incorporate these suggestions in the next patch-set.

Again, why is kms_frontbuffer_tracking not considered? Reinventing wheels
is not good, and kms_frontbuffer_tracking implements all of the above
stuff afaik.
-Daniel

> 
> -Ankit
> 
> 
> On 11/15/2016 2:28 PM, Daniel Vetter wrote:
> > On Mon, Nov 14, 2016 at 01:06:09PM +0000, Chris Wilson wrote:
> > > On Mon, Nov 14, 2016 at 02:44:35PM +0200, Petri Latvala wrote:
> > > > Chris, happy with this revision?
> > > Me? No. It still uses a thread instead of events, so I don't think it
> > > qualifies as a good example for anyone else wanting to do the same thing.
> > > Lots of hardcoded expectations (specific sleep patterns, rather than
> > > waiting for the kernel to change with a timeout for failure). It doesn't
> > > check all the possible ways that the output maybe changed (and if they
> > > are irrelevent, that too also needs to be tested to establish expected
> > > behaviour and catch future regressions). Important question, how is
> > > userspace expected to know that the vrefresh changed? How do get around
> > > that userspace is expecting a fixed vblank frequency?
> > for display power testing we already have the kms_frontbuffer_tracking
> > testcase, adding a DRRS variants to that one should resolve all this.
> > 
> > And then kms_drrs would be empty, except when we (if ever) do explicit
> > drrs through modeset requests. And that would just be checking that the
> > observed timings match the requested timings.
> > -Daniel
>

Patch

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index a837977..5f31521 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -91,6 +91,7 @@  TESTS_progs_M = \
 	kms_cursor_crc \
 	kms_cursor_legacy \
 	kms_draw_crc \
+	kms_drrs \
 	kms_fbc_crc \
 	kms_fbcon_fbt \
 	kms_flip \
diff --git a/tests/kms_drrs.c b/tests/kms_drrs.c
new file mode 100644
index 0000000..bd5a135
--- /dev/null
+++ b/tests/kms_drrs.c
@@ -0,0 +1,599 @@ 
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "drmtest.h"
+#include "igt_debugfs.h"
+#include "igt_kms.h"
+#include "intel_chipset.h"
+#include "intel_batchbuffer.h"
+#include "ioctl_wrappers.h"
+#include <time.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <sys/time.h>
+IGT_TEST_DESCRIPTION(
+"Performs write operations and then waits for DRRS to invoke the"
+"Low Refresh Rate and then disturbs the contents of the screen once"
+"again hence DRRS revert back to High Refresh Rate(Default).");
+
+#define DRRS_STATUS_BYTES_CNT	1000
+#define SET	1
+#define RESET	0
+
+/*
+ * Structure to store data to create 2 framebuffers, fb[0] and fb[1] on a given
+ * display. To disturb the content of the screen, we replace fb[0] by fb[1] and
+ * vice versa.
+ */
+typedef struct {
+	int drm_fd;
+	uint32_t devid;
+	uint32_t handle[2];
+	igt_display_t display;
+	igt_output_t *output;
+	enum pipe pipe;
+	igt_plane_t *primary;
+	struct igt_fb fb[2];
+	uint32_t fb_id[2];
+} data_t;
+
+/*
+ * Structure to count vblank and note the starting time of the counter
+ */
+typedef struct {
+	unsigned int vbl_count;
+	struct timeval start;
+} vbl_info;
+
+/*
+ * Condition variables,mutex, and shared variables for thread synchronization
+ */
+pthread_mutex_t rr_mutex;
+pthread_cond_t cv_rr_calc_requested;
+pthread_cond_t cv_rr_calc_completed;
+int rr_calc_requested = RESET;
+int rr_calc_completed = RESET;
+int thread_flag = SET;
+int refresh_rate_shared = -1;
+
+/*
+ * Structure for refresh rate type
+ */
+typedef struct{
+	int rate;
+	const char *name;
+} refresh_rate_t;
+
+static inline uint32_t pipe_select(int pipe)
+{
+	if (pipe > 1)
+		return pipe << DRM_VBLANK_HIGH_CRTC_SHIFT;
+	else if (pipe > 0)
+		return DRM_VBLANK_SECONDARY;
+	else
+		return 0;
+}
+
+/*
+ * igt_millisec_elapsed:
+ *	Calculates the no. of millisec elapsed since timeval start
+ */
+static double igt_millisec_elapsed(const struct timeval *start)
+{
+	struct timeval curr;
+	double res;
+
+	gettimeofday(&curr, NULL);
+	return (1e6*(curr.tv_sec - start->tv_sec) +
+				(curr.tv_usec - start->tv_usec)/1000.00);
+}
+
+/*
+ * read_drrs_status :
+ *	Func to read the DRRS status from debugfs
+ */
+static bool read_drrs_status(char *str)
+{
+	FILE *status;
+	int cnt;
+
+	status = igt_debugfs_fopen("i915_drrs_status", "r");
+	igt_assert(status);
+
+	cnt = fread(str, DRRS_STATUS_BYTES_CNT - 1, 1, status);
+	if (!cnt) {
+		if (!feof(status)) {
+			igt_info("ERROR: %d at fread\n", ferror(status));
+			return false;
+		}
+		clearerr(status);
+	}
+	fclose(status);
+	return true;
+}
+
+/*
+ * is_drrs_supported :
+ *	Func to check for DRRS support
+ */
+static bool is_drrs_supported(void)
+{
+	char str[DRRS_STATUS_BYTES_CNT] = {};
+
+	if (!read_drrs_status(str)) {
+		igt_info("ERROR: Debugfs read FAILED\n");
+		return false;
+	}
+	return strstr(str, "DRRS Supported: Yes") != NULL;
+}
+
+/*
+ * is_drrs_enabled :
+ *	Func to check if DRRS is enabled by driver
+ */
+static bool is_drrs_enabled(void)
+{
+	char str[DRRS_STATUS_BYTES_CNT] = {};
+
+	if (!read_drrs_status(str)) {
+		igt_info("ERROR: Debugfs read FAILED\n");
+		return false;
+	}
+	return strstr(str, "Idleness DRRS: Disabled") == NULL;
+}
+
+/*
+ * prepare_crtc :
+ *	Func to prepare crtc for the given display
+ */
+static bool prepare_crtc(data_t *data)
+{
+	if (data == NULL)
+		return false;
+
+	igt_display_t *display = &data->display;
+	igt_output_t *output = data->output;
+
+	/* select the pipe we want to use */
+	igt_output_set_pipe(output, data->pipe);
+	igt_display_commit(display);
+
+	if (!output->valid) {
+		igt_output_set_pipe(output, PIPE_ANY);
+		igt_display_commit(display);
+		return false;
+	}
+
+	return true;
+}
+/*
+ * vbl_rate :
+ *	calculates the vblank rate by counting vblanks between start and end
+ *	period, divided by time between start and end.
+ */
+static double vbl_rate(const union drm_wait_vblank *start,
+				const union drm_wait_vblank *end) {
+	double s, e;
+
+	s = start->reply.tval_sec + 1e-6 * start->reply.tval_usec;
+	e = end->reply.tval_sec + 1e-6 * end->reply.tval_usec;
+	return ((end->reply.sequence - start->reply.sequence) / (e - s));
+}
+
+/*
+ * calculate_refresh_rate :
+ *	Func to calculate the refresh rate by counting
+ *	vblanks in 1 sec (1000 ms). It returns the calculated refresh rate on
+ *	success. Returns -1 in case of error.
+ */
+int calculate_refresh_rate(data_t *data)
+{
+#define PERIOD_MS 1000
+	union drm_wait_vblank start, end;
+	struct timeval start_tv;
+
+	memset(&start, 0, sizeof(start));
+	start.request.type = DRM_VBLANK_RELATIVE | pipe_select(data->pipe);
+	if (drmWaitVBlank(data->drm_fd, &start) != 0) {
+		igt_info("ERROR : drmWaitVBlank Failed!\n");
+		return -1;
+	}
+	gettimeofday(&start_tv, NULL);
+	while (igt_millisec_elapsed(&start_tv) < PERIOD_MS) {
+		memset(&end, 0, sizeof(end));
+		end.request.type = DRM_VBLANK_RELATIVE |
+						pipe_select(data->pipe);
+		end.request.sequence = 1;
+		if (drmWaitVBlank(data->drm_fd, &end) != 0) {
+			igt_info("ERROR : drmWaitVBlank Failed!\n");
+			return -1;
+		}
+	}
+	return vbl_rate(&start, &end);
+}
+
+/*
+ * worker_thread_func :
+ *	Func which is run by a worker thread to calculate the refresh_rate,
+ *	when signalled by the master thread.
+ */
+void *worker_thread_func(void *ptr)
+{
+	data_t *data = (data_t *) ptr;
+
+	while (1) {
+		int refresh_rate = 0;
+		/*wait for signal from master*/
+		pthread_mutex_lock(&rr_mutex);
+		while (!rr_calc_requested)
+			pthread_cond_wait(&cv_rr_calc_requested, &rr_mutex);
+
+		/* checkpoint for thread termination */
+		if (thread_flag == RESET) {
+			pthread_mutex_unlock(&rr_mutex);
+			pthread_exit(NULL);
+		}
+		rr_calc_requested = RESET;
+		pthread_mutex_unlock(&rr_mutex);
+		/*calculate refresh_rate*/
+		refresh_rate = calculate_refresh_rate(data);
+
+		/* signal the master */
+		pthread_mutex_lock(&rr_mutex);
+		refresh_rate_shared = refresh_rate;
+		rr_calc_completed = SET;
+		pthread_mutex_unlock(&rr_mutex);
+		pthread_cond_signal(&cv_rr_calc_completed);
+	}
+	return NULL;
+}
+
+/*
+ * check_refresh_rate :
+ *	Func to check the refresh rate calculated, against the expected refresh
+ *	rate. It signals the worker thread to calculate the refresh-
+ *	rate, and checks if the correct refresh rate is switched.
+ *	Returns 0 in case of pass , 1 in case of failure, and -1 for error.
+ */
+
+static int check_refresh_rate(data_t *data, refresh_rate_t *expected_rr)
+{
+/*
+ * The calculated refresh-rate is an approximation to estimated refresh-rate.
+ * The tolerance threshold for the difference is set to 2. Difference more than
+ * 2 is considered as failure for the check_refresh_rate.
+ */
+#define TOLERANCE_THRESHOLD		2
+	int refresh_rate = -1;
+	char drrs_status[DRRS_STATUS_BYTES_CNT] = {};
+
+	/* Signal worker thread to calculate refresh rate */
+	pthread_mutex_lock(&rr_mutex);
+	rr_calc_requested = SET;
+	pthread_mutex_unlock(&rr_mutex);
+	pthread_cond_signal(&cv_rr_calc_requested);
+
+	/* Get the DRRS Status from the debugfs entry */
+	if (!read_drrs_status(drrs_status)) {
+		igt_info("ERROR : DRRS debugfs read FAILED\n");
+		return -1;
+	}
+	/* Wait for the refresh rate calculator thread */
+	pthread_mutex_lock(&rr_mutex);
+	while (!rr_calc_completed)
+		pthread_cond_wait(&cv_rr_calc_completed, &rr_mutex);
+	rr_calc_completed = RESET;
+	refresh_rate = refresh_rate_shared;
+	pthread_mutex_unlock(&rr_mutex);
+	if (refresh_rate < 0) {
+		igt_info("ERROR : Refresh rate calculation FAILED\n");
+		return -1;
+	}
+	igt_info("INFO : Actual Refresh_rate based on Vblank Counts/sec = %d\n"
+							, refresh_rate);
+
+	/* Compare with Expected Refresh Rate*/
+	igt_info("INFO: Expected Refresh-Rate %d\n", expected_rr->rate);
+	if (strstr(drrs_status, expected_rr->name) != NULL
+	&& abs(refresh_rate - expected_rr->rate) <= TOLERANCE_THRESHOLD) {
+		igt_info("INFO: Expected %s : PASSED\n", expected_rr->name);
+		return 0;
+	}
+
+	igt_info("INFO : Expected %s : FAILED.\n", expected_rr->name);
+	return 1;
+}
+
+/*
+ * clean_up :
+ *	Func to stop the worker thread and destroy thread syncronization
+ *	structures.
+ */
+void clean_up(pthread_t rr_thread)
+{
+	/* Stop the worker thread */
+	pthread_mutex_lock(&rr_mutex);
+	thread_flag = RESET;
+	rr_calc_requested = SET;
+	pthread_mutex_unlock(&rr_mutex);
+	pthread_cond_signal(&cv_rr_calc_requested);
+	pthread_join(rr_thread, NULL);
+
+	/* destroy the condition variables and mutex */
+	pthread_cond_destroy(&cv_rr_calc_requested);
+	pthread_cond_destroy(&cv_rr_calc_completed);
+	pthread_mutex_destroy(&rr_mutex);
+}
+
+/*
+ * execute_test:
+ *	This function
+ *	1. Initializes the thread sync structures.
+ *	2. Creates a worker thread which can be signaled to estimate
+ *	the refresh rates based on counting vblanks per sec.
+ *	3. Creates two different Framebuffer fb0, fb1
+ *	and apply them in the interval of 1.2Sec. So between FB change
+ *	DRRS should toggle from DRRS_HIGH_RR -> DRRS_LOW_RR.
+ *	And on next FB change DRRS_LOW_RR -> DRRS_HIGH_RR.
+ *
+ *	These expected transitions are verified using the kernel debugfs
+ *	and the refresh-rate, calculated by counting vblanks per sec by the
+ *	worker thread.
+ */
+static int execute_test(data_t *data)
+{
+	igt_display_t *display = &data->display;
+	igt_output_t *output = data->output;
+	drmModeModeInfo *mode, *supported_modes;
+	int test_failed = 0;
+	int ret, i, count_modes;
+	refresh_rate_t high_rr, low_rr;
+	pthread_t rr_thread;
+
+	/*initialize the condition variables and  mutex*/
+	pthread_cond_init(&cv_rr_calc_requested, NULL);
+	pthread_cond_init(&cv_rr_calc_completed, NULL);
+	pthread_mutex_init(&rr_mutex, NULL);
+	thread_flag = SET;
+	rr_calc_requested = RESET;
+	rr_calc_completed = RESET;
+	/* create a thread for calculating the refresh rate */
+	ret = pthread_create(&rr_thread, NULL, worker_thread_func,
+							(void *) data);
+	if (ret == -1) {
+		igt_info("ERROR : Refresh rate thread creation FAILED\n");
+		clean_up(rr_thread);
+		return -1;
+	}
+
+	high_rr.name = "DRRS_HIGH_RR";
+	high_rr.rate = 0;
+	low_rr.name = "DRRS_LOW_RR";
+	low_rr.rate = 0;
+	/* get the max and min supported refresh rates for the display */
+	supported_modes = output->config.connector->modes;
+	count_modes = output->config.connector->count_modes;
+	/* minimum 2 modes are required for DRRS */
+	if (count_modes < 2) {
+		igt_info("ERROR: Minimum 2 modes required for DRRS\n");
+		return -1;
+	}
+	for (i = 0; i < count_modes; i++) {
+		int rr = supported_modes[i].vrefresh;
+
+		if (i == 0) {
+			high_rr.rate = low_rr.rate = rr;
+			continue;
+		}
+		if (high_rr.rate < rr)
+			high_rr.rate = rr;
+		if (low_rr.rate > rr)
+			low_rr.rate = rr;
+	}
+	data->primary = igt_output_get_plane(data->output, IGT_PLANE_PRIMARY);
+	mode = igt_output_get_mode(data->output);
+	data->fb_id[0] = igt_create_color_fb(data->drm_fd, mode->hdisplay,
+			mode->vdisplay,
+			DRM_FORMAT_XRGB8888,
+			LOCAL_DRM_FORMAT_MOD_NONE,
+			0.0, 100.1, 0.0, &data->fb[0]);
+	igt_assert(data->fb_id[0]);
+	data->fb_id[1] = igt_create_color_fb(data->drm_fd, mode->hdisplay,
+			mode->vdisplay,
+			DRM_FORMAT_XRGB8888,
+			LOCAL_DRM_FORMAT_MOD_NONE,
+			100.1, 0.0, 0.0,
+			&data->fb[1]);
+	igt_assert(data->fb_id[1]);
+
+	data->handle[0] = data->fb[0].gem_handle;
+	data->handle[1] = data->fb[1].gem_handle;
+
+	/* scanout = fb[1] */
+	igt_plane_set_fb(data->primary, &data->fb[1]);
+	igt_display_commit(display);
+	if (!is_drrs_enabled()) {
+		igt_info("INFO : DRRS not enabled\n");
+		igt_plane_set_fb(data->primary, NULL);
+		igt_output_set_pipe(output, PIPE_ANY);
+		igt_display_commit(display);
+		igt_remove_fb(data->drm_fd, &data->fb[0]);
+		igt_remove_fb(data->drm_fd, &data->fb[1]);
+		clean_up(rr_thread);
+		return -1;
+	}
+
+	/* expecting High RR */
+	ret =  check_refresh_rate(data, &high_rr);
+	if (ret == -1)
+		return -1;
+	if (ret == 1)
+		test_failed = 1;
+	/* 1.2Sec to Enter the Idleness and check for Low Refresh Rate */
+	usleep(1200000);
+	ret =  check_refresh_rate(data, &low_rr);
+	if (ret == -1)
+		return -1;
+	if (ret == 1)
+		test_failed = 1;
+
+	/* scanout = fb[0] and check for High Refresh Rate*/
+	igt_plane_set_fb(data->primary, &data->fb[0]);
+	igt_display_commit(display);
+	ret =  check_refresh_rate(data, &high_rr);
+	if (ret == -1)
+		return -1;
+	if (ret == 1)
+		test_failed = 1;
+
+	/* 1.2Sec to Enter the Idleness and check for Low Refresh Rate */
+	usleep(1200000);
+	ret =  check_refresh_rate(data, &low_rr);
+	if (ret == -1)
+		return -1;
+	if (ret == 1)
+		test_failed = 1;
+
+	/* scanout = fb[1] and check for High Refresh Rate*/
+	igt_plane_set_fb(data->primary, &data->fb[1]);
+	igt_display_commit(display);
+	ret =  check_refresh_rate(data, &high_rr);
+	if (ret == -1)
+		return -1;
+	if (ret == 1)
+		test_failed = 1;
+
+	/* 1.2Sec to Enter the Idleness */
+	usleep(1200000);
+	ret =  check_refresh_rate(data, &low_rr);
+	if (ret == -1)
+		return -1;
+	if (ret == 1)
+		test_failed = 1;
+
+	clean_up(rr_thread);
+	return test_failed;
+}
+
+/*
+ * finish_crtc :
+ *	Func to free the framebuffers after the test completion.
+ */
+static void finish_crtc(data_t *data)
+{
+	igt_plane_set_fb(data->primary, NULL);
+	igt_output_set_pipe(data->output, PIPE_ANY);
+	igt_display_commit(&data->display);
+
+	igt_remove_fb(data->drm_fd, &data->fb[0]);
+	igt_remove_fb(data->drm_fd, &data->fb[1]);
+}
+
+/*
+ * reset_display :
+ *	Func to reset the display structures after the test completion.
+ */
+static void reset_display(data_t *data)
+{
+	igt_display_t *display = &data->display;
+
+	for_each_connected_output(display, data->output) {
+		if (data->output->valid) {
+			data->primary =  igt_output_get_plane(data->output,
+							IGT_PLANE_PRIMARY);
+			igt_plane_set_fb(data->primary, NULL);
+		}
+		igt_output_set_pipe(data->output, PIPE_ANY);
+	}
+}
+/*
+ * run_test :
+ *	Func to run the test for the eDP display.
+ */
+static void run_test(data_t *data)
+{
+	igt_display_t *display = &data->display;
+	int ret;
+
+	reset_display(data);
+	/* Check for eDP Connector on PIPE A ,as eDP goes normally on PIPE_A */
+	for_each_connected_output(display, data->output) {
+		drmModeConnectorPtr c = data->output->config.connector;
+
+		if (c->connector_type != DRM_MODE_CONNECTOR_eDP ||
+			c->connection != DRM_MODE_CONNECTED)
+			continue;
+		data->pipe = PIPE_A;
+		igt_assert_f(prepare_crtc(data), "Failed to prepare CRTC\n");
+		igt_info("INFO : Beginning %s on pipe %s,connector %s\n",
+					igt_test_name(),
+					kmstest_pipe_name(data->pipe),
+					igt_output_name(data->output));
+
+		ret = execute_test(data);
+		igt_skip_on_f(ret == -1,
+				"INFO :%s on pipe %s, connector %s:SKIPPED\n",
+					igt_test_name(),
+					kmstest_pipe_name(data->pipe),
+					igt_output_name(data->output));
+		igt_fail_on_f(ret == 1,
+				"INFO :%s on pipe %s, connector %s:FAILED\n",
+					igt_test_name(),
+					kmstest_pipe_name(data->pipe),
+					igt_output_name(data->output));
+
+		igt_assert_f(ret == 0,
+				"INFO :%s on pipe %s, connector %s: PASSED\n",
+					igt_test_name(),
+					kmstest_pipe_name(data->pipe),
+					igt_output_name(data->output));
+
+		finish_crtc(data);
+	}
+}
+
+igt_simple_main
+{
+	data_t data = {};
+
+	igt_skip_on_simulation();
+	data.drm_fd = drm_open_driver_master(DRIVER_INTEL);
+	if (data.drm_fd == -1) {
+		igt_info("ERROR : invalid fd\n");
+		return;
+	}
+	data.devid = intel_get_drm_devid(data.drm_fd);
+	if (data.devid < 0) {
+		igt_info("ERROR : invalid dev id\n");
+		return;
+	}
+	/* Check if the DRRS is supported.
+	 * If yes call the Idleness DRRS test
+	 */
+	igt_require_f(is_drrs_supported(),
+			"DRRS not supported:check VBT/panel caps\n");
+	igt_display_init(&data.display, data.drm_fd);
+	run_test(&data);
+	igt_display_fini(&data.display);
+}