[media] omap3isp: preview: Optimize parameters setup for the common case

If no parameter needs to be modified, make preview_config() and
preview_setup_hw() return immediately. This speeds up interrupt handling
in the common case.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/media/video/omap3isp/isppreview.c b/drivers/media/video/omap3isp/isppreview.c
index cf5014f2302d..04c96899f005 100644
--- a/drivers/media/video/omap3isp/isppreview.c
+++ b/drivers/media/video/omap3isp/isppreview.c
@@ -889,6 +889,9 @@ static int preview_config(struct isp_prev_device *prev,
         struct preview_update *attr;
         int i, bit, rval = 0;
 
+        if (cfg->update == 0)
+                return 0;
+
         params = &prev->params;
 
         if (prev->state != ISP_PIPELINE_STREAM_STOPPED) {
@@ -944,6 +947,9 @@ static void preview_setup_hw(struct isp_prev_device *prev)
         int i, bit;
         void *param_ptr;
 
+        if (prev->update == 0)
+                return;
+
         for (i = 0; i < ARRAY_SIZE(update_attrs); i++) {
                 attr = &update_attrs[i];