drm: Add drm_rect_debug_print()

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

v2: Renamed drm_region to drm_rect, the function from drm_region_debug
    to drm_rect_debug_print(), and use %+d instead of +%d in the format.
v3: Use %d format for width/height in the non fixed point case as well

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 23 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_rect.c b/drivers/gpu/drm/drm_rect.c
index dc11a2867f20..7047ca025787 100644
--- a/drivers/gpu/drm/drm_rect.c
+++ b/drivers/gpu/drm/drm_rect.c
@@ -24,6 +24,7 @@
 #include <linux/errno.h>
 #include <linux/export.h>
 #include <linux/kernel.h>
+#include <drm/drmP.h>
 #include <drm/drm_rect.h>
 
 /**
@@ -271,3 +272,24 @@ int drm_rect_calc_vscale_relaxed(struct drm_rect *src,
         return vscale;
 }
 EXPORT_SYMBOL(drm_rect_calc_vscale_relaxed);
+
+/**
+ * drm_rect_debug_print - print the rectangle information
+ * @r: rectangle to print
+ * @fixed_point: rectangle is in 16.16 fixed point format
+ */
+void drm_rect_debug_print(const struct drm_rect *r, bool fixed_point)
+{
+        int w = drm_rect_width(r);
+        int h = drm_rect_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("%dx%d%+d%+d\n", w, h, r->x1, r->y1);
+}
+EXPORT_SYMBOL(drm_rect_debug_print);
diff --git a/include/drm/drm_rect.h b/include/drm/drm_rect.h
index de24f16a3c4f..fe767b757c8c 100644
--- a/include/drm/drm_rect.h
+++ b/include/drm/drm_rect.h
@@ -140,5 +140,6 @@ int drm_rect_calc_hscale_relaxed(struct drm_rect *src,
 int drm_rect_calc_vscale_relaxed(struct drm_rect *src,
                                  struct drm_rect *dst,
                                  int min_vscale, int max_vscale);
+void drm_rect_debug_print(const struct drm_rect *r, bool fixed_point);
 
 #endif