Hi Swati,

On 5/1/2026 12:39 AM, Swati Sharma wrote:
> Add test cases where we are validating force dsc and force
> joiner.
>
> v2: -fix if() for ultra/big joiner (Ankit)
> v3: -Add '-' separator in subtest names when using
>       igt_get_joined_pipes_name (Santhosh)
> v4: -Use 'enum joined_pipes force_joined_pipes' in data_t (Ankit)
>      -Use dsc-basic-%s format for subtest names (Ankit)
>      -Use igt_crtc_for_pipe() to check consecutive HW pipes,
>       handling fused pipe holes properly (Ankit)
> v5: -Use igt_display_n_crtcs() instead of open-coded
>       for_each_crtc counting loop (Jani)
>
> Signed-off-by: Swati Sharma<swati2.sharma@intel.com>
> ---
>   tests/intel/kms_dsc.c | 203 +++++++++++++++++++++++++++---------------
>   1 file changed, 131 insertions(+), 72 deletions(-)
>
> diff --git a/tests/intel/kms_dsc.c b/tests/intel/kms_dsc.c
> index 69f335da3..9a19de1c4 100644
> --- a/tests/intel/kms_dsc.c
> +++ b/tests/intel/kms_dsc.c
> @@ -55,7 +55,27 @@
>    * @with-output-formats-with-bpc: DSC with output formats with certain input BPC for the connector
>    * @fractional-bpp:               DSC with fractional bpp with default parameters
>    * @fractional-bpp-with-bpc:      DSC with fractional bpp with certain input BPC for the connector
> - */
> + *
> + * SUBTEST: dsc-%s-%s
> + * Description: Tests Display Stream Compression functionality if supported by a
> + *              connector by forcing %arg[1] and %arg[2] on all connectors that support it
> + *

IMHO, better to call out the default/existing tests as non-joiner to 
avoid any confusion.

May be we could have something like this:

 1. non-joiner: If display is non-joiner go ahead as is, if not force
    non-joiner.
 2. big-joiner: if display is big-joiner go ahead as is, if not force
    big-joiner.
 3. ultra-joiner: if display is ultra-joiner go ahead as is, if not
    force ultra-joiner.

> + * arg[1]:
> + *
> + * @basic:                        DSC with default parameters
> + * @with-bpc:                     DSC with certain input BPC for the connector
> + * @with-bpc-formats:             DSC with certain input BPC for the connector and diff formats
> + * @with-formats:                 DSC with default parameters and creating fb with diff formats
> + * @with-output-formats:          DSC with output formats
> + * @with-output-formats-with-bpc: DSC with output formats with certain input BPC for the connector
> + * @fractional-bpp:               DSC with fractional bpp with default parameters
> + * @fractional-bpp-with-bpc:      DSC with fractional bpp with certain input BPC for the connector
> + *
> + * arg[2]:
> + *
> + * @bigjoiner:			  big joiner
> + * @ultrajoiner:		  ultra joiner
> +*/
>   
>   IGT_TEST_DESCRIPTION("Test to validate display stream compression");
>   
> @@ -81,11 +101,13 @@ typedef struct {
>   	int disp_ver;
>   	igt_crtc_t *crtc;
>   	bool limited;
> +	enum joined_pipes force_joined_pipes;
>   } data_t;
>   
>   static int output_format_list[] = {DSC_FORMAT_YCBCR420, DSC_FORMAT_YCBCR444};
>   static int format_list[] = {DRM_FORMAT_XYUV8888, DRM_FORMAT_XRGB2101010, DRM_FORMAT_XRGB16161616F, DRM_FORMAT_YUYV};
>   static uint32_t bpc_list[] = {8, 10, 12};
> +static enum joined_pipes joiner_tests[] = {JOINED_PIPES_DEFAULT, JOINED_PIPES_BIG_JOINER, JOINED_PIPES_ULTRA_JOINER};
>   
>   static inline void manual(const char *expected)
>   {
> @@ -135,6 +157,7 @@ static void update_display(data_t *data, uint32_t test_type)
>   	int current_bpc = 0;
>   	igt_plane_t *primary;
>   	drmModeModeInfo *mode;
> +	bool status;
>   	igt_output_t *output = data->output;
>   	igt_display_t *display = &data->display;
>   	drmModeConnector *connector = output->config.connector;
> @@ -147,6 +170,11 @@ static void update_display(data_t *data, uint32_t test_type)
>   	save_force_dsc_en(data->drm_fd, data->output);
>   	force_dsc_enable(data->drm_fd, data->output);
>   
> +	if (data->force_joined_pipes == JOINED_PIPES_BIG_JOINER || data->force_joined_pipes == JOINED_PIPES_ULTRA_JOINER) {
> +		status = kmstest_force_connector_joiner(data->drm_fd, connector, data->force_joined_pipes);
> +		igt_assert_f(status, "Failed to toggle force joiner\n");
> +	}
> +
There seem to be few more issues with checkpatch here, mostly the 
LONG_LINE which is okay if unavoidable but I feel in most places it 
could be handled here. So please check.
>   	if (test_type & TEST_DSC_BPC) {
>   		igt_debug("Trying to set input BPC to %d\n", data->input_bpc);
>   		force_dsc_enable_bpc(data->drm_fd, data->output, data->input_bpc);
> @@ -246,11 +274,13 @@ reset:
>   
>   static void test_dsc(data_t *data, uint32_t test_type, int bpc,
>   		     unsigned int plane_format,
> -		     enum dsc_output_format output_format)
> +		     enum dsc_output_format output_format,
> +		     enum joined_pipes joined_pipes)
>   {
>   	igt_display_t *display = &data->display;
>   	igt_output_t *output;
>   	igt_crtc_t *crtc;
> +	int n_pipes = igt_display_n_crtcs(display);
>   	char name[3][LEN] = {
>   				{0},
>   				{0},
> @@ -259,12 +289,17 @@ static void test_dsc(data_t *data, uint32_t test_type, int bpc,
>   
>   	igt_require(check_gen11_bpc_constraint(data->drm_fd, data->input_bpc));
>   
> +	if (joined_pipes != JOINED_PIPES_DEFAULT &&
> +	    !igt_is_joiner_supported_by_source(data->drm_fd, joined_pipes))
> +		return;
> +
>   	for_each_crtc_with_valid_output(display, crtc, output) {
>   		data->output_format = output_format;
>   		data->plane_format = plane_format;
>   		data->input_bpc = bpc;
>   		data->output = output;
>   		data->crtc = crtc;
> +		data->force_joined_pipes = joined_pipes;
>   
>   		if (!is_dsc_supported_by_sink(data->drm_fd, data->output) ||
>   		    !check_gen11_dp_constraint(data->drm_fd, data->output, data->crtc))
> @@ -285,6 +320,26 @@ static void test_dsc(data_t *data, uint32_t test_type, int bpc,
>   						      data->drm_fd, data->output)))
>   			continue;
>   
> +		/*
> +		 * Check joiner constraints and verify that we have
> +		 * enough consecutive HW pipes starting from this crtc.
> +		 * Use igt_crtc_for_pipe() to handle fused pipe holes.
> +		 */
> +		if (joined_pipes != JOINED_PIPES_DEFAULT &&
> +		    !check_dsc_joiner_constraints(data->drm_fd, data->output,
> +						  n_pipes, joined_pipes))
> +			continue;
> +
> +		if (joined_pipes == JOINED_PIPES_BIG_JOINER &&
> +		    !igt_crtc_for_pipe(display, crtc->pipe + 1))
> +			continue;
> +
> +		if (joined_pipes == JOINED_PIPES_ULTRA_JOINER &&
> +		    (!igt_crtc_for_pipe(display, crtc->pipe + 1) ||
> +		     !igt_crtc_for_pipe(display, crtc->pipe + 2) ||
> +		     !igt_crtc_for_pipe(display, crtc->pipe + 3)))
> +			continue;

Could this be added in the joiner helper rather than having it specific 
to test?

Thanks and Regards,
Karthik.B.S
> +
>   		if (test_type & TEST_DSC_OUTPUT_FORMAT)
>   			snprintf(&name[0][0], LEN, "-%s", kmstest_dsc_output_format_str(data->output_format));
>   		if (test_type & TEST_DSC_FORMAT)
> @@ -334,85 +389,89 @@ int igt_main_args("l", NULL, help_str, opt_handler, &data)
>   		igt_require(is_dsc_supported_by_source(data.drm_fd));
>   	}
>   
> -	igt_describe("Tests basic display stream compression functionality if supported "
> -		     "by a connector by forcing DSC on all connectors that support it "
> -		     "with default parameters");
> -	igt_subtest_with_dynamic("dsc-basic")
> -			test_dsc(&data, TEST_DSC_BASIC, DEFAULT_BPC,
> -				 DRM_FORMAT_XRGB8888, DSC_FORMAT_RGB);
> -
> -	igt_describe("Tests basic display stream compression functionality if supported "
> -		     "by a connector by forcing DSC on all connectors that support it "
> -		     "with default parameters and creating fb with diff formats");
> -	igt_subtest_with_dynamic("dsc-with-formats") {
> -		for (int k = 0; k < ARRAY_SIZE(format_list); k++)
> -			test_dsc(&data, TEST_DSC_FORMAT, DEFAULT_BPC,
> -				 format_list[k], DSC_FORMAT_RGB);
> -	}
>   
> -	igt_describe("Tests basic display stream compression functionality if supported "
> -		     "by a connector by forcing DSC on all connectors that support it "
> -		     "with certain input BPC for the connector");
> -	igt_subtest_with_dynamic("dsc-with-bpc") {
> -		for (int j = 0; j < ARRAY_SIZE(bpc_list); j++)
> -			test_dsc(&data, TEST_DSC_BPC, bpc_list[j],
> -				 DRM_FORMAT_XRGB8888, DSC_FORMAT_RGB);
> -	}
> +	for (int i = 0; i < ARRAY_SIZE(joiner_tests) ; i++) {
> +		igt_describe("Tests basic display stream compression functionality if supported "
> +			     "by a connector by forcing DSC on all connectors that support it "
> +			     "with default parameters");
> +		igt_subtest_with_dynamic_f("dsc-basic%s%s", joiner_tests[i] ? "-" : "", igt_get_joined_pipes_name(joiner_tests[i])) {
> +				test_dsc(&data, TEST_DSC_BASIC, DEFAULT_BPC,
> +					 DRM_FORMAT_XRGB8888, DSC_FORMAT_RGB, joiner_tests[i]);
> +		}
>   
> -	igt_describe("Tests basic display stream compression functionality if supported "
> -		     "by a connector by forcing DSC on all connectors that support it "
> -		     "with certain input BPC for the connector with diff formats");
> -	igt_subtest_with_dynamic("dsc-with-bpc-formats") {
> -		for (int j = 0; j < ARRAY_SIZE(bpc_list); j++) {
> -			for (int k = 0; k < ARRAY_SIZE(format_list); k++) {
> -				test_dsc(&data, TEST_DSC_BPC | TEST_DSC_FORMAT,
> -				bpc_list[j], format_list[k],
> -				DSC_FORMAT_RGB);
> -			}
> +		igt_describe("Tests basic display stream compression functionality if supported "
> +			     "by a connector by forcing DSC on all connectors that support it "
> +			     "with default parameters and creating fb with diff formats");
> +		igt_subtest_with_dynamic_f("dsc-with-formats%s%s", joiner_tests[i] ? "-" : "", igt_get_joined_pipes_name(joiner_tests[i])) {
> +			for (int k = 0; k < ARRAY_SIZE(format_list); k++)
> +				test_dsc(&data, TEST_DSC_FORMAT, DEFAULT_BPC,
> +					 format_list[k], DSC_FORMAT_RGB, joiner_tests[i]);
>   		}
> -	}
>   
> -	igt_describe("Tests basic display stream compression functionality if supported "
> -		     "by a connector by forcing DSC and output format on all connectors "
> -		     "that support it");
> -	igt_subtest_with_dynamic("dsc-with-output-formats") {
> -		for (int k = 0; k < ARRAY_SIZE(output_format_list); k++)
> -			test_dsc(&data, TEST_DSC_OUTPUT_FORMAT, DEFAULT_BPC,
> -				 DRM_FORMAT_XRGB8888,
> -				 output_format_list[k]);
> -	}
> +		igt_describe("Tests basic display stream compression functionality if supported "
> +			     "by a connector by forcing DSC on all connectors that support it "
> +			     "with certain input BPC for the connector");
> +		igt_subtest_with_dynamic_f("dsc-with-bpc%s%s", joiner_tests[i] ? "-" : "", igt_get_joined_pipes_name(joiner_tests[i])) {
> +			for (int j = 0; j < ARRAY_SIZE(bpc_list); j++)
> +				test_dsc(&data, TEST_DSC_BPC, bpc_list[j],
> +					 DRM_FORMAT_XRGB8888, DSC_FORMAT_RGB, joiner_tests[i]);
> +		}
>   
> -	igt_describe("Tests basic display stream compression functionality if supported "
> -		     "by a connector by forcing DSC and output format on all connectors "
> -		     "that support it with certain input BPC for the connector");
> -	igt_subtest_with_dynamic("dsc-with-output-formats-with-bpc") {
> -		for (int k = 0; k < ARRAY_SIZE(output_format_list); k++) {
> +		igt_describe("Tests basic display stream compression functionality if supported "
> +			     "by a connector by forcing DSC on all connectors that support it "
> +			     "with certain input BPC for the connector with diff formats");
> +		igt_subtest_with_dynamic_f("dsc-with-bpc-formats%s%s", joiner_tests[i] ? "-" : "", igt_get_joined_pipes_name(joiner_tests[i])) {
>   			for (int j = 0; j < ARRAY_SIZE(bpc_list); j++) {
> -				test_dsc(&data, TEST_DSC_OUTPUT_FORMAT | TEST_DSC_BPC,
> -					 bpc_list[j], DRM_FORMAT_XRGB8888,
> -					 output_format_list[k]);
> +				for (int k = 0; k < ARRAY_SIZE(format_list); k++) {
> +					test_dsc(&data, TEST_DSC_BPC | TEST_DSC_FORMAT,
> +					bpc_list[j], format_list[k],
> +					DSC_FORMAT_RGB, joiner_tests[i]);
> +				}
>   			}
>   		}
> -	}
>   
> -	igt_describe("Tests fractional compressed bpp functionality if supported "
> -		     "by a connector by forcing fractional_bpp on all connectors that support it "
> -		     "with default parameter. While finding the optimum compressed bpp, driver will "
> -		     "skip over the compressed bpps with integer values. It will go ahead with DSC, "
> -		     "iff compressed bpp is fractional, failing in which, it will fail the commit.");
> -	igt_subtest_with_dynamic("dsc-fractional-bpp")
> -			test_dsc(&data, TEST_DSC_FRACTIONAL_BPP,
> -				 DEFAULT_BPC, DRM_FORMAT_XRGB8888,
> -				 DSC_FORMAT_RGB);
> -
> -	igt_describe("Tests fractional compressed bpp functionality if supported "
> -		     "by a connector by forcing fractional_bpp on all connectors that support it "
> -		     "with certain input BPC for the connector.");
> -	igt_subtest_with_dynamic("dsc-fractional-bpp-with-bpc") {
> -		for (int j = 0; j < ARRAY_SIZE(bpc_list); j++)
> -			test_dsc(&data, TEST_DSC_FRACTIONAL_BPP | TEST_DSC_BPC,
> -				 bpc_list[j], DRM_FORMAT_XRGB8888,
> -				 DSC_FORMAT_RGB);
> +		igt_describe("Tests basic display stream compression functionality if supported "
> +			     "by a connector by forcing DSC and output format on all connectors "
> +			     "that support it");
> +		igt_subtest_with_dynamic_f("dsc-with-output-formats%s%s", joiner_tests[i] ? "-" : "", igt_get_joined_pipes_name(joiner_tests[i])) {
> +			for (int k = 0; k < ARRAY_SIZE(output_format_list); k++)
> +				test_dsc(&data, TEST_DSC_OUTPUT_FORMAT, DEFAULT_BPC,
> +					 DRM_FORMAT_XRGB8888,
> +					 output_format_list[k], joiner_tests[i]);
> +		}
> +
> +		igt_describe("Tests basic display stream compression functionality if supported "
> +			     "by a connector by forcing DSC and output format on all connectors "
> +			     "that support it with certain input BPC for the connector");
> +		igt_subtest_with_dynamic_f("dsc-with-output-formats-with-bpc%s%s", joiner_tests[i] ? "-" : "", igt_get_joined_pipes_name(joiner_tests[i])) {
> +			for (int k = 0; k < ARRAY_SIZE(output_format_list); k++) {
> +				for (int j = 0; j < ARRAY_SIZE(bpc_list); j++) {
> +					test_dsc(&data, TEST_DSC_OUTPUT_FORMAT | TEST_DSC_BPC,
> +						 bpc_list[j], DRM_FORMAT_XRGB8888,
> +						 output_format_list[k], joiner_tests[i]);
> +				}
> +			}
> +		}
> +
> +		igt_describe("Tests fractional compressed bpp functionality if supported "
> +			     "by a connector by forcing fractional_bpp on all connectors that support it "
> +			     "with default parameter. While finding the optimum compressed bpp, driver will "
> +			     "skip over the compressed bpps with integer values. It will go ahead with DSC, "
> +			     "iff compressed bpp is fractional, failing in which, it will fail the commit.");
> +		igt_subtest_with_dynamic_f("dsc-fractional-bpp%s%s", joiner_tests[i] ? "-" : "", igt_get_joined_pipes_name(joiner_tests[i]))
> +				test_dsc(&data, TEST_DSC_FRACTIONAL_BPP,
> +					 DEFAULT_BPC, DRM_FORMAT_XRGB8888,
> +					 DSC_FORMAT_RGB, joiner_tests[i]);
> +
> +		igt_describe("Tests fractional compressed bpp functionality if supported "
> +			     "by a connector by forcing fractional_bpp on all connectors that support it "
> +			     "with certain input BPC for the connector.");
> +		igt_subtest_with_dynamic_f("dsc-fractional-bpp-with-bpc%s%s", joiner_tests[i] ? "-" : "", igt_get_joined_pipes_name(joiner_tests[i])) {
> +			for (int j = 0; j < ARRAY_SIZE(bpc_list); j++)
> +				test_dsc(&data, TEST_DSC_FRACTIONAL_BPP | TEST_DSC_BPC,
> +					 bpc_list[j], DRM_FORMAT_XRGB8888,
> +					 DSC_FORMAT_RGB, joiner_tests[i]);
> +			}
>   	}
>   
>   	igt_fixture() {