[PATCH 3/4] drm: Add drm_region_debug()

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Add a debug function to print the region in a human readable format.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/drm_region.c | 22 ++++++++++++++++++++++
 include/drm/drm_region.h     |  1 +
 2 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/drm_region.c b/drivers/gpu/drm/drm_region.c
index c694424..82e1043 100644
--- a/drivers/gpu/drm/drm_region.c
+++ b/drivers/gpu/drm/drm_region.c
@@ -24,6 +24,7 @@
 #include <linux/errno.h>
 #include <linux/export.h>
 #include <linux/kernel.h>
+#include <drm/drmP.h>
 #include <drm/drm_region.h>
 
 /**
@@ -266,3 +267,24 @@ int drm_calc_vscale_relaxed(struct drm_region *src, struct drm_region *dst,
 	return vscale;
 }
 EXPORT_SYMBOL(drm_calc_vscale_relaxed);
+
+/**
+ * drm_region_debug - print the region information
+ * @r: region to print
+ * @fixed_point: is the region in 16.16 fixed point format
+ */
+void drm_region_debug(const struct drm_region *r, bool fixed_point)
+{
+	int w = drm_region_width(r);
+	int h = drm_region_height(r);
+
+	if (fixed_point)
+		DRM_DEBUG_KMS("%d.%06ux%d.%06u+%d.%06u+%d.%06u\n",
+			      w >> 16, ((w & 0xffff) * 15625) >> 10,
+			      h >> 16, ((h & 0xffff) * 15625) >> 10,
+			      r->x1 >> 16, ((r->x1 & 0xffff) * 15625) >> 10,
+			      r->y1 >> 16, ((r->y1 & 0xffff) * 15625) >> 10);
+	else
+		DRM_DEBUG_KMS("%ux%u+%d+%d\n", w, h, r->x1, r->y1);
+}
+EXPORT_SYMBOL(drm_region_debug);
diff --git a/include/drm/drm_region.h b/include/drm/drm_region.h
index c12d953..10591f5 100644
--- a/include/drm/drm_region.h
+++ b/include/drm/drm_region.h
@@ -136,5 +136,6 @@ int drm_calc_hscale_relaxed(struct drm_region *src, struct drm_region *dst,
 			    int min_hscale, int max_hscale);
 int drm_calc_vscale_relaxed(struct drm_region *src, struct drm_region *dst,
 			    int min_vscale, int max_vscale);
+void drm_region_debug(const struct drm_region *r, bool fixed_point);
 
 #endif
-- 
1.7.12.4