[igt-dev] [PATCH i-g-t 2/3] lib/igt_kms: add get_num_scalers()

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

Add get_num_scalers(), which will return no. of scalers/CRTC.

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
---
 lib/igt_kms.c | 39 +++++++++++++++++++++++++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 40 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 8dc0edc89..666a69495 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6084,3 +6084,42 @@ int igt_get_dp_mst_connector_id(igt_output_t *output)
 
 	return connector_id;
 }
+
+/**
+ * get_num_scalers:
+ * @drm_fd: drm file descriptor
+ * @pipe: display pipe
+ *
+ * Returns: num_scalers supported/pipe.
+ */
+int get_num_scalers(int drm_fd, enum pipe pipe)
+{
+	char buf[8120];
+	char *start_loc1, *start_loc2;
+	int dir, res;
+	int num_scalers = 0;
+	char dest[20] = ":pipe ";
+
+	strcat(dest, kmstest_pipe_name(pipe));
+
+	if (is_intel_device(drm_fd) &&
+	    intel_display_ver(intel_get_drm_devid(drm_fd)) >= 9) {
+
+		dir = igt_debugfs_dir(drm_fd);
+		igt_assert(dir >= 0);
+
+		res = igt_debugfs_simple_read(dir, "i915_display_info", buf, sizeof(buf));
+		close(dir);
+		igt_require(res > 0);
+
+		start_loc1 = strstr(buf, dest);
+		printf("start_loc1=%s\n", start_loc1);
+
+		if ((start_loc1 = strstr(buf, dest))) {
+			igt_assert(start_loc2 = strstr(start_loc1, "num_scalers="));
+			igt_assert_eq(sscanf(start_loc2, "num_scalers=%d", &num_scalers), 1);
+		}
+	}
+
+	return num_scalers;
+}
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 4bcaf3f73..356620dc6 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1016,5 +1016,6 @@ bool igt_parse_mode_string(const char *mode_string, drmModeModeInfo *mode);
 bool i915_pipe_output_combo_valid(igt_display_t *display);
 bool igt_check_output_is_dp_mst(igt_output_t *output);
 int igt_get_dp_mst_connector_id(igt_output_t *output);
+int get_num_scalers(int drm_fd, enum pipe pipe);
 
 #endif /* __IGT_KMS_H__ */
-- 
2.25.1