[igt-dev] [PATCH i-g-t v4 3/3] tests: add igt_is_dsc_supported_by_source()

[Swati Sharma <swati2.sharma@intel.com>]

Instead of assuming dsc is supported on gen11+ platforms,
lets use has_dsc flag in i915_capability to check hardware
support.

v2: -moved changes to lib (Ankit)
v3: -keep includes in alphabetical order (Kamil)
    -don't use igt_require() in lib (Kamil)
    -improve return statement (Kamil)
v4: -add debug print (Kamil)

Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Cc: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 lib/igt_dsc.c               | 22 ++++++++++++++++++++++
 lib/igt_dsc.h               |  1 +
 tests/i915/kms_dsc.c        |  2 +-
 tests/i915/kms_dsc_helper.c | 10 ++++++++++
 tests/i915/kms_dsc_helper.h |  1 +
 tests/kms_invalid_mode.c    |  3 ++-
 6 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/lib/igt_dsc.c b/lib/igt_dsc.c
index 6cbd8bae..76a420c1 100644
--- a/lib/igt_dsc.c
+++ b/lib/igt_dsc.c
@@ -6,6 +6,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <string.h>
+#include "igt_core.h"
 #include "igt_dsc.h"
 #include "igt_sysfs.h"
 
@@ -41,6 +42,27 @@ static int write_dsc_debugfs(int drmfd, char *connector_name, const char *file_n
 	return ret;
 }
 
+/*
+ * igt_is_dsc_supported_by_source:
+ * @drmfd: A drm file descriptor
+ *
+ * Returns: True if DSC is supported by source, false otherwise.
+ */
+bool igt_is_dsc_supported_by_source(int drmfd)
+{
+	char buf[4096];
+	int dir, res;
+
+	dir = igt_debugfs_dir(drmfd);
+	igt_assert(dir >= 0);
+
+	res = igt_debugfs_simple_read(dir, "i915_capabilities",
+				      buf, sizeof(buf));
+	close(dir);
+
+	return res > 0 ? strstr(buf, "has_dsc: yes") : 0;
+}
+
 /*
  * igt_is_dsc_supported_by_sink:
  * @drmfd: A drm file descriptor
diff --git a/lib/igt_dsc.h b/lib/igt_dsc.h
index 241fc0ac..b58743b5 100644
--- a/lib/igt_dsc.h
+++ b/lib/igt_dsc.h
@@ -9,6 +9,7 @@
 #include "igt_fb.h"
 #include "igt_kms.h"
 
+bool igt_is_dsc_supported_by_source(int drmfd);
 bool igt_is_dsc_supported_by_sink(int drmfd, char *connector_name);
 bool igt_is_fec_supported(int drmfd, char *connector_name);
 bool igt_is_dsc_enabled(int drmfd, char *connector_name);
diff --git a/tests/i915/kms_dsc.c b/tests/i915/kms_dsc.c
index 5b4abd6a..c0707806 100644
--- a/tests/i915/kms_dsc.c
+++ b/tests/i915/kms_dsc.c
@@ -287,7 +287,7 @@ igt_main_args("l", NULL, help_str, opt_handler, &data)
 		igt_install_exit_handler(kms_dsc_exit_handler);
 		igt_display_require(&data.display, data.drm_fd);
 		igt_display_require_output(&data.display);
-		igt_require(data.disp_ver >= 11);
+		igt_require(is_dsc_supported_by_source(data.drm_fd));
 	}
 
 	igt_describe("Tests basic display stream compression functionality if supported "
diff --git a/tests/i915/kms_dsc_helper.c b/tests/i915/kms_dsc_helper.c
index c90d833d..61f76dde 100644
--- a/tests/i915/kms_dsc_helper.c
+++ b/tests/i915/kms_dsc_helper.c
@@ -53,6 +53,16 @@ void kms_dsc_exit_handler(int sig)
 	restore_force_dsc_en();
 }
 
+bool is_dsc_supported_by_source(int drmfd)
+{
+	if (!igt_is_dsc_supported_by_source(drmfd)) {
+		igt_debug("DSC not supported by source\n");
+		return false;
+	}
+
+	return true;
+}
+
 bool is_dsc_supported_by_sink(int drmfd, igt_output_t *output)
 {
 	if (!igt_is_dsc_supported_by_sink(drmfd, output->name)) {
diff --git a/tests/i915/kms_dsc_helper.h b/tests/i915/kms_dsc_helper.h
index f66191c7..2109bd76 100644
--- a/tests/i915/kms_dsc_helper.h
+++ b/tests/i915/kms_dsc_helper.h
@@ -27,6 +27,7 @@ void save_force_dsc_en(int drmfd, igt_output_t *output);
 void restore_force_dsc_en(void);
 void kms_dsc_exit_handler(int sig);
 bool is_dsc_supported_by_sink(int drmfd, igt_output_t *output);
+bool is_dsc_supported_by_source(int drmfd);
 bool check_gen11_dp_constraint(int drmfd, igt_output_t *output, enum pipe pipe);
 bool check_gen11_bpc_constraint(int drmfd, igt_output_t *output, int input_bpc);
 void force_dsc_output_format(int drmfd, igt_output_t *output,
diff --git a/tests/kms_invalid_mode.c b/tests/kms_invalid_mode.c
index 63da3a1c..2bb9912f 100644
--- a/tests/kms_invalid_mode.c
+++ b/tests/kms_invalid_mode.c
@@ -60,7 +60,8 @@ can_bigjoiner(data_t *data)
 	if (intel_display_ver(devid) > 12) {
 		igt_debug("Platform supports uncompressed bigjoiner\n");
 		return true;
-	} else if (intel_display_ver(devid) >= 11) {
+	} else if (igt_is_dsc_supported_by_source(data->drm_fd)) {
+		igt_debug("Platform supports compressed bigjoiner\n");
 		return igt_is_dsc_supported_by_sink(data->drm_fd, data->output->name);
 	}
 
-- 
2.25.1