[igt-dev] [PATCH i-g-t v2 4/5] lib/amd: Add check for SubVP feature status

[Aurabindo Pillai]

Add an API to check whether Subviewport feature is supported and enabled

Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
---
 lib/igt_amd.c | 29 +++++++++++++++++++++++++++++
 lib/igt_amd.h |  1 +
 2 files changed, 30 insertions(+)

diff --git a/lib/igt_amd.c b/lib/igt_amd.c
index 177a1094d..247a42f37 100644
--- a/lib/igt_amd.c
+++ b/lib/igt_amd.c
@@ -45,6 +45,8 @@
 #define Y6 64
 #define Y7 128
 
+#define subvp_supported "sub-viewport supported: yes"
+#define subvp_enabled "sub-viewport supported: yes, enabled: yes"
 #define mall_supported "mall supported: yes"
 #define mall_enabled "mall supported: yes, enabled: yes"
 
@@ -1203,6 +1205,33 @@ void igt_amd_get_mall_status(int drm_fd, bool *supported, bool *enabled)
 		*enabled = true;
 }
 
+/**
+ * @brief check if AMDGPU sub-viewport support exists
+ *
+ * @param drm_fd DRM file descriptor
+ * @param supported set to true if harwdare supports subviewport
+ * @param enabled set tot true if subviewport is currently in use
+ */
+void igt_amd_get_subvp_status(int drm_fd, bool *supported, bool *enabled)
+{
+	char buf[1024];
+	char *subvp_loc;
+
+	*supported = false;
+	*enabled = false;
+
+	if (!get_dm_capabilities(drm_fd, buf, 1024))
+		return;
+
+	subvp_loc = strstr(buf, subvp_supported);
+	if (subvp_loc)
+		*supported = true;
+
+	subvp_loc = strstr(buf, subvp_enabled);
+	if (subvp_loc && *supported)
+		*enabled = true;
+}
+
 /**
  * @brief check if AMDGPU DM visual confirm debugfs interface entry exist and defined
  *
diff --git a/lib/igt_amd.h b/lib/igt_amd.h
index de992ac4f..1e66348ad 100644
--- a/lib/igt_amd.h
+++ b/lib/igt_amd.h
@@ -200,5 +200,6 @@ int  igt_amd_get_visual_confirm(int drm_fd);
 bool igt_amd_set_visual_confirm(int drm_fd, enum amdgpu_debug_visual_confirm option);
 
 void igt_amd_get_mall_status(int drm_fd, bool *supported, bool *enabled);
+void igt_amd_get_subvp_status(int drm_fd, bool *supported, bool *enabled);
 bool igt_amd_output_has_odm_combine_segments(int drm_fd, char *connector_name);
 #endif /* IGT_AMD_H */
-- 
2.39.2