[PATCH i-g-t 4/5] lib/dsc: Add igt_get_dsc_sink_compressed_bpp()

[Swati Sharma]

Function is added to return compressed bpp after
parsing i915_display_info debugfs.

Signed-off-by: Swati Sharma <swati2.sharma at intel.com>
---
 lib/igt_dsc.c | 37 +++++++++++++++++++++++++++++++++++++
 lib/igt_dsc.h |  1 +
 2 files changed, 38 insertions(+)

diff --git a/lib/igt_dsc.c b/lib/igt_dsc.c
index 21677b0e0..db7af3c7c 100644
--- a/lib/igt_dsc.c
+++ b/lib/igt_dsc.c
@@ -350,3 +350,40 @@ int igt_get_dsc_sink_max_slice_count(int drmfd, char *connector_name)
 
 	return max_slice_count;
 }
+
+/**
+ * igt_get_dsc_sink_compressed_bpp:
+ * @drmfd: A drm file descriptor
+ * @pipe: display pipe
+ *
+ * Returns: The dsc sink compressed bpp.
+ */
+int igt_get_dsc_sink_compressed_bpp(int drmfd, enum pipe pipe)
+{
+	char buf[8120];
+	char dest[20] = ":pipe ";
+	char *start_loc1, *start_loc2;
+	int dir, res;
+	float comp_bpp = 0;
+
+	strcat(dest, kmstest_pipe_name(pipe));
+
+	dir = igt_debugfs_dir(drmfd);
+	igt_assert_lte(0, dir);
+
+	igt_require_intel(drmfd);
+
+	res = igt_debugfs_simple_read(dir, "i915_display_info", buf, sizeof(buf));
+	igt_require(res > 0);
+	close(dir);
+
+	start_loc1 = strstr(buf, dest);
+
+	if ((start_loc1 = strstr(buf, dest))) {
+		igt_assert(start_loc2 = strstr(buf, "dsc-dss: compressed-bpp:"));
+		igt_assert_eq(sscanf(start_loc2, "dsc-dss: compressed-bpp:%f", &comp_bpp), 1);
+		igt_assert(comp_bpp > 0);
+	}
+
+	return comp_bpp;
+}
diff --git a/lib/igt_dsc.h b/lib/igt_dsc.h
index ab5d27b06..f7d13c99c 100644
--- a/lib/igt_dsc.h
+++ b/lib/igt_dsc.h
@@ -29,5 +29,6 @@ bool igt_is_force_dsc_fractional_bpp_enabled(int drmfd, char *connector_name);
 int igt_force_dsc_fractional_bpp_enable(int drmfd, char *connector_name);
 int igt_get_dsc_fractional_bpp_debugfs_fd(int drmfd, char *connector_name);
 int igt_get_dsc_sink_max_slice_count(int drmfd, char *connector_name);
+int igt_get_dsc_sink_compressed_bpp(int drmfd, enum pipe pipe);
 
 #endif
-- 
2.25.1