sna: Tweak number of threads for short areas

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/src/sna/sna_threads.c b/src/sna/sna_threads.c
index 83b180f..f9c6b1e 100644 (file)
--- a/src/sna/sna_threads.c
+++ b/src/sna/sna_threads.c
@@ -259,8 +259,8 @@ int sna_use_threads(int width, int height, int threshold)
        if (max_threads <= 0)
                return 1;
 
-       if (height <= max_threads)
-               return height;
+       if (height <= 1)
+               return 1;
 
        if (width < 128)
                height /= 128/width;
@@ -271,6 +271,9 @@ int sna_use_threads(int width, int height, int threshold)
 
        if (num_threads > max_threads)
                num_threads = max_threads;
+       if (num_threads > height)
+               num_threads = height;
+
        return num_threads;
 }