[PATCH v2 2/4] omap3isp: preview: Optimize parameters setup for the common case

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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@xxxxxxxxxxxxxxxx>
Acked-by: Sakari Ailus <sakari.ailus@xxxxxx>
---
 drivers/media/video/omap3isp/isppreview.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/media/video/omap3isp/isppreview.c b/drivers/media/video/omap3isp/isppreview.c
index cf5014f..2b5c137 100644
--- a/drivers/media/video/omap3isp/isppreview.c
+++ b/drivers/media/video/omap3isp/isppreview.c
@@ -890,6 +890,8 @@ static int preview_config(struct isp_prev_device *prev,
 	int i, bit, rval = 0;
 
 	params = &prev->params;
+	if (cfg->update == 0)
+		return 0;
 
 	if (prev->state != ISP_PIPELINE_STREAM_STOPPED) {
 		unsigned long flags;
@@ -944,6 +946,9 @@ static void preview_setup_hw(struct isp_prev_device *prev)
 	int i, bit;
 	void *param_ptr;
 
+	if (params->update == 0)
+		return;
+
 	for (i = 0; i < ARRAY_SIZE(update_attrs); i++) {
 		attr = &update_attrs[i];
 
-- 
1.7.3.4

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