[PATCH v4 10/12] media: ov5640: Add 60 fps support

[Maxime Ripard <maxime.ripard@xxxxxxxxxxx>]

Now that we have everything in place to compute the clock rate at runtime,
we can enable the 60fps framerate for the mode we tested it with.

Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
---
 drivers/media/i2c/ov5640.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index b2206fa71b0d..9ce12c3cf7c7 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -110,6 +110,7 @@ enum ov5640_mode_id {
 enum ov5640_frame_rate {
 	OV5640_15_FPS = 0,
 	OV5640_30_FPS,
+	OV5640_60_FPS,
 	OV5640_NUM_FRAMERATES,
 };
 
@@ -138,6 +139,7 @@ MODULE_PARM_DESC(virtual_channel,
 static const int ov5640_framerates[] = {
 	[OV5640_15_FPS] = 15,
 	[OV5640_30_FPS] = 30,
+	[OV5640_60_FPS] = 60,
 };
 
 /* regulator supplies */
@@ -1483,6 +1485,11 @@ ov5640_find_mode(struct ov5640_dev *sensor, enum ov5640_frame_rate fr,
 	    (!nearest && (mode->hact != width || mode->vact != height)))
 		return NULL;
 
+	/* Only 640x480 can operate at 60fps (for now) */
+	if (fr == OV5640_60_FPS &&
+	    !(mode->hact == 640 && mode->vact == 480))
+		return NULL;
+
 	return mode;
 }
 
@@ -1980,12 +1987,13 @@ static int ov5640_try_frame_interval(struct ov5640_dev *sensor,
 	int i;
 
 	minfps = ov5640_framerates[OV5640_15_FPS];
-	maxfps = ov5640_framerates[OV5640_30_FPS];
+	maxfps = ov5640_framerates[OV5640_60_FPS];
 
 	if (fi->numerator == 0) {
 		fi->denominator = maxfps;
 		fi->numerator = 1;
-		return OV5640_30_FPS;
+		rate = OV5640_60_FPS;
+		goto find_mode;
 	}
 
 	fps = clamp_val(DIV_ROUND_CLOSEST(fi->denominator, fi->numerator),
@@ -2004,6 +2012,7 @@ static int ov5640_try_frame_interval(struct ov5640_dev *sensor,
 	fi->numerator = 1;
 	fi->denominator = best_fps;
 
+find_mode:
 	mode = ov5640_find_mode(sensor, rate, width, height, false);
 	return mode ? rate : -EINVAL;
 }
@@ -2623,8 +2632,11 @@ static int ov5640_s_frame_interval(struct v4l2_subdev *sd,
 
 	frame_rate = ov5640_try_frame_interval(sensor, &fi->interval,
 					       mode->hact, mode->vact);
-	if (frame_rate < 0)
-		frame_rate = OV5640_15_FPS;
+	if (frame_rate < 0) {
+		/* Always return a valid frame interval value */
+		fi->interval = sensor->frame_interval;
+		goto out;
+	}
 
 	sensor->current_fr = frame_rate;
 	sensor->frame_interval = fi->interval;
-- 
2.19.1