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

[Imre Deak <imre.deak@intel.com>]

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@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?

>  	}
>  
>  	igt_describe("This test validates display engine entry to DC5 state "
> -- 
> 2.43.0
>