[PATCH i-g-t v2] tests/intel/kms_pm_dc: Remove PkgC dependecy to validate deep-pkgc test

[Thasleem, Mohammed]

On 3/25/2025 9:58 PM, Imre Deak wrote:
> On Sun, Mar 09, 2025 at 03:58:33PM +0530, Mohammed Thasleem wrote:
>> PkgC counter was removed from MTL onwards, so an alternative counter was
>> used to validate deep pkgC tests. With the new KMD changes, a dedicated DC6
>> debugfs entry counter has been created to validate these tests,
>> allowing for the removal of the existing alternative counter code.
>>
>> v2: Updated igt_describe and discription.
>>
>> Signed-off-by: Mohammed Thasleem <mohammed.thasleem at intel.com>
>> ---
>>   tests/intel/kms_pm_dc.c | 34 ++++++++++------------------------
>>   1 file changed, 10 insertions(+), 24 deletions(-)
>>
>> diff --git a/tests/intel/kms_pm_dc.c b/tests/intel/kms_pm_dc.c
>> index b4f30a37d..ed24a24b8 100644
>> --- a/tests/intel/kms_pm_dc.c
>> +++ b/tests/intel/kms_pm_dc.c
>> @@ -78,7 +78,8 @@
>>    * Description: This test validates display engine entry to DC9 state
>>    *
>>    * SUBTEST: deep-pkgc
>> - * Description: This test validates display engine entry to PKGC10 state for extended vblank
>> + * Description: This test validates display engine entry to deep pkgc by
>> + *              checking dc6 entry for extended vblank
>>    * Functionality: pm_dc
>>    *
>>    * SUBTEST: dc5-retention-flops
>> @@ -617,22 +618,7 @@ static int has_panels_without_dc_support(igt_display_t *display)
>>   	return external_panel;
>>   }
>>   
>> -static unsigned int read_pkgc_counter(int debugfs_root_fd)
>> -{
>> -	char buf[4096];
>> -	char *str;
>> -	int len;
>> -
>> -	len = igt_sysfs_read(debugfs_root_fd, PACKAGE_CSTATE_PATH, buf, sizeof(buf) - 1);
>> -	igt_skip_on_f(len < 0, "PKGC state file not found\n");
>> -	buf[len] = '\0';
>> -	str = strstr(buf, "Package C10");
>> -	igt_skip_on_f(!str, "PKGC10 is not supported.\n");
>> -
>> -	return get_dc_counter(str);
>> -}
>> -
>> -static void test_deep_pkgc_state(data_t *data)
>> +static void test_deep_pkgc_state(data_t *data, int dc_target)
>>   {
>>   	unsigned int pre_val = 0, cur_val = 0;
>>   	time_t start = time(NULL);
>> @@ -694,7 +680,7 @@ static void test_deep_pkgc_state(data_t *data)
>>   	igt_display_commit(&data->display);
>>   	/* Wait for the vblank to sync the frame time */
>>   	igt_wait_for_vblank_count(data->drm_fd, data->display.pipes[pipe].crtc_offset, 1);
>> -	pre_val = read_pkgc_counter(data->debugfs_root_fd);
>> +	pre_val = read_dc_counter(data->debugfs_fd, dc_target);
>>   	/* Add a half-frame delay to ensure the flip occurs when the frame is active. */
>>   	usleep(delay * 0.5);
>>   
>> @@ -703,8 +689,8 @@ static void test_deep_pkgc_state(data_t *data)
>>   		igt_plane_set_fb(primary, flip ? &data->fb_rgb : &data->fb_rgr);
>>   		igt_display_commit(&data->display);
>>   
>> -		igt_wait((cur_val = read_pkgc_counter(data->debugfs_root_fd)) > pre_val,
>> -						      (delay * 2), (5 * MSEC));
>> +		igt_wait((cur_val = read_dc_counter(data->debugfs_fd, dc_target)) > pre_val,
>> +						    (delay * 2), (5 * MSEC));
>>   		if (cur_val > pre_val) {
>>   			pkgc_flag = true;
>>   			break;
>> @@ -712,7 +698,7 @@ static void test_deep_pkgc_state(data_t *data)
>>   	}
>>   
>>   	cleanup_dc3co_fbs(data);
>> -	igt_assert_f(pkgc_flag, "PKGC10 is not achieved.\n");
>> +	igt_assert_f(pkgc_flag, "Deep pkgc state is not achieved.\n");
>>   }
>>   
>>   static void kms_poll_state_restore(int sig)
>> @@ -781,13 +767,13 @@ igt_main
>>   		test_dc_state_psr(&data, CHECK_DC6);
>>   	}
>>   
>> -	igt_describe("This test validates display engine entry to PKGC10 state "
>> -		     "during extended vblank");
>> +	igt_describe("This test validates display engine entry to deep pkgc by "
>> +		     "checking dc6 state entry during extended vblank");
>>   	igt_subtest("deep-pkgc") {
>>   		igt_require_f(igt_pm_pc8_plus_residencies_enabled(data.msr_fd),
>>   			      "PC8+ residencies not supported\n");
>>   		igt_require(intel_display_ver(data.devid) >= 20);
>> -		test_deep_pkgc_state(&data);
>> +		test_deep_pkgc_state(&data, CHECK_DC6);
> 
> What would be now the difference between this and the DC6 tests?
	-->this test also depends on deep-pkgc(pkgc8), which validates 	display 
engine entry to PkgC8 state for extended vblank scenario. 	Here we took 
ref of pkgc10 as pkgc8 has been removed.
> 
>>   	}
>>   
>>   	igt_describe("This test validates display engine entry to DC5 state "
>> -- 
>> 2.43.0
>>