[PATCH i-g-t v4 5/5] lib/igt_kms: Added pipe_id_to_vbl_flag() to igt_kms.

[robert.foss@collabora.com]

From: Robert Foss <robert.foss@collabora.com>

Added function pipe_id_to_vbl_flag() to igt_kms.
This function formats a pipe_id into the format
expected by DRM while processing DRM_IOCTL_WAIT_VBLANK.

Signed-off-by: Robert Foss <robert.foss@collabora.com>
---
 lib/igt_kms.c | 16 ++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 99b6279..48b95e6 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -2557,3 +2557,19 @@ void igt_reset_connectors(void)
 		close(fd);
 	}
 }
+
+/**
+ * pipe_id_to_vbl_flag:
+ *
+ * Convert a pipe if into the flag representation
+ * expected in DRM while processing DRM_IOCTL_WAIT_VBLANK.
+ */
+uint32_t pipe_id_to_vbl_flag(uint32_t pipe_id)
+{
+	if (pipe_id == 0)
+		return 0;
+	else if (pipe_id == 1)
+		return 1 | _DRM_VBLANK_SECONDARY;
+	else
+		return pipe_id << 1;
+}
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index d9a4e11..f74edaf 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -400,6 +400,7 @@ void igt_wait_for_vblank(int drm_fd, enum pipe pipe);
 
 void igt_enable_connectors(void);
 void igt_reset_connectors(void);
+uint32_t pipe_id_to_vbl_flag(uint32_t pipe_id);
 
 #define EDID_LENGTH 128
 const unsigned char* igt_kms_get_base_edid(void);
-- 
2.5.0

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