[PATCH v9 11/28] rcar-vin: do not allow changing scaling and composing while streaming

Niklas Söderlund
2017-12-08T01:09:00Z

It is possible on Gen2 to change the registers controlling composing and
scaling while the stream is running. It is however not a good idea to do
so and could result in trouble. There are also no good reasons to allow
this, remove immediate reflection in hardware registers from
vidioc_s_selection and only configure scaling and composing when the
stream starts.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
---
drivers/media/platform/rcar-vin/rcar-dma.c | 2 +-
drivers/media/platform/rcar-vin/rcar-v4l2.c | 3 ---
drivers/media/platform/rcar-vin/rcar-vin.h | 3 ---
3 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
index fd14be20a6604d7a..7be5080f742825fb 100644
--- a/drivers/media/platform/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/rcar-vin/rcar-dma.c
@@ -514,7 +514,7 @@ static void rvin_set_coeff(struct rvin_dev *vin, unsigned short xs)
rvin_write(vin, p_set->coeff_set[23], VNC8C_REG);
}

-void rvin_crop_scale_comp(struct rvin_dev *vin)
+static void rvin_crop_scale_comp(struct rvin_dev *vin)
{
u32 xs, ys;

diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
index 254fa1c8770275a5..d6298c684ab2d731 100644
--- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
+++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
@@ -436,9 +436,6 @@ static int rvin_s_selection(struct file *file, void *fh,
return -EINVAL;
}

- /* HW supports modifying configuration while running */
- rvin_crop_scale_comp(vin);
-
return 0;
}

diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
index 36d0f0cc4ce01a6e..67541b483ee43c52 100644
--- a/drivers/media/platform/rcar-vin/rcar-vin.h
+++ b/drivers/media/platform/rcar-vin/rcar-vin.h
@@ -175,7 +175,4 @@ void rvin_v4l2_unregister(struct rvin_dev *vin);

const struct rvin_video_format *rvin_format_from_pixel(u32 pixelformat);

-/* Cropping, composing and scaling */
-void rvin_crop_scale_comp(struct rvin_dev *vin);
-
#endif
--
2.15.0