[media] v4l: vsp1: sru: Make the intensity controllable during streaming

The control value is currently stored in the SRU structure by the
control set handler and written to the hardware at stream on time,
making control set during streaming ineffective. Fix it by writing to
the registers from within the control set handler.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 59 insertions, 42 deletions

diff --git a/drivers/media/platform/vsp1/vsp1_sru.c b/drivers/media/platform/vsp1/vsp1_sru.c
index 18e127accf25..b7d3c8b9f189 100644
--- a/drivers/media/platform/vsp1/vsp1_sru.c
+++ b/drivers/media/platform/vsp1/vsp1_sru.c
@@ -42,39 +42,6 @@ static inline void vsp1_sru_write(struct vsp1_sru *sru, u32 reg, u32 data)
 
 #define V4L2_CID_VSP1_SRU_INTENSITY		(V4L2_CID_USER_BASE + 1)
 
-static int sru_s_ctrl(struct v4l2_ctrl *ctrl)
-{
-	struct vsp1_sru *sru =
-		container_of(ctrl->handler, struct vsp1_sru, ctrls);
-
-	switch (ctrl->id) {
-	case V4L2_CID_VSP1_SRU_INTENSITY:
-		sru->intensity = ctrl->val;
-		break;
-	}
-
-	return 0;
-}
-
-static const struct v4l2_ctrl_ops sru_ctrl_ops = {
-	.s_ctrl = sru_s_ctrl,
-};
-
-static const struct v4l2_ctrl_config sru_intensity_control = {
-	.ops = &sru_ctrl_ops,
-	.id = V4L2_CID_VSP1_SRU_INTENSITY,
-	.name = "Intensity",
-	.type = V4L2_CTRL_TYPE_INTEGER,
-	.min = 1,
-	.max = 6,
-	.def = 1,
-	.step = 1,
-};
-
-/* -----------------------------------------------------------------------------
- * V4L2 Subdevice Core Operations
- */
-
 struct vsp1_sru_param {
 	u32 ctrl0;
 	u32 ctrl2;
@@ -111,22 +78,66 @@ static const struct vsp1_sru_param vsp1_sru_params[] = {
 	},
 };
 
+static int sru_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct vsp1_sru *sru =
+		container_of(ctrl->handler, struct vsp1_sru, ctrls);
+	const struct vsp1_sru_param *param;
+	u32 value;
+
+	switch (ctrl->id) {
+	case V4L2_CID_VSP1_SRU_INTENSITY:
+		param = &vsp1_sru_params[ctrl->val - 1];
+
+		value = vsp1_sru_read(sru, VI6_SRU_CTRL0);
+		value &= ~(VI6_SRU_CTRL0_PARAM0_MASK |
+			   VI6_SRU_CTRL0_PARAM1_MASK);
+		value |= param->ctrl0;
+		vsp1_sru_write(sru, VI6_SRU_CTRL0, value);
+
+		vsp1_sru_write(sru, VI6_SRU_CTRL2, param->ctrl2);
+		break;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_ctrl_ops sru_ctrl_ops = {
+	.s_ctrl = sru_s_ctrl,
+};
+
+static const struct v4l2_ctrl_config sru_intensity_control = {
+	.ops = &sru_ctrl_ops,
+	.id = V4L2_CID_VSP1_SRU_INTENSITY,
+	.name = "Intensity",
+	.type = V4L2_CTRL_TYPE_INTEGER,
+	.min = 1,
+	.max = 6,
+	.def = 1,
+	.step = 1,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdevice Core Operations
+ */
+
 static int sru_s_stream(struct v4l2_subdev *subdev, int enable)
 {
 	struct vsp1_sru *sru = to_sru(subdev);
-	const struct vsp1_sru_param *param;
 	struct v4l2_mbus_framefmt *input;
 	struct v4l2_mbus_framefmt *output;
-	bool upscale;
 	u32 ctrl0;
+	int ret;
+
+	ret = vsp1_entity_set_streaming(&sru->entity, enable);
+	if (ret < 0)
+		return ret;
 
 	if (!enable)
 		return 0;
 
 	input = &sru->entity.formats[SRU_PAD_SINK];
 	output = &sru->entity.formats[SRU_PAD_SOURCE];
-	upscale = input->width != output->width;
-	param = &vsp1_sru_params[sru->intensity];
 
 	if (input->code == V4L2_MBUS_FMT_ARGB8888_1X32)
 		ctrl0 = VI6_SRU_CTRL0_PARAM2 | VI6_SRU_CTRL0_PARAM3
@@ -134,10 +145,18 @@ static int sru_s_stream(struct v4l2_subdev *subdev, int enable)
 	else
 		ctrl0 = VI6_SRU_CTRL0_PARAM3;
 
-	vsp1_sru_write(sru, VI6_SRU_CTRL0, param->ctrl0 | ctrl0 |
-		       (upscale ? VI6_SRU_CTRL0_MODE_UPSCALE : 0));
+	if (input->width != output->width)
+		ctrl0 |= VI6_SRU_CTRL0_MODE_UPSCALE;
+
+	/* Take the control handler lock to ensure that the CTRL0 value won't be
+	 * changed behind our back by a set control operation.
+	 */
+	mutex_lock(sru->ctrls.lock);
+	ctrl0 |= vsp1_sru_read(sru, VI6_SRU_CTRL0)
+	       & (VI6_SRU_CTRL0_PARAM0_MASK | VI6_SRU_CTRL0_PARAM1_MASK);
+	mutex_unlock(sru->ctrls.lock);
+
 	vsp1_sru_write(sru, VI6_SRU_CTRL1, VI6_SRU_CTRL1_PARAM5);
-	vsp1_sru_write(sru, VI6_SRU_CTRL2, param->ctrl2);
 
 	return 0;
 }
@@ -359,7 +378,5 @@ struct vsp1_sru *vsp1_sru_create(struct vsp1_device *vsp1)
 		return ERR_PTR(ret);
 	}
 
-	v4l2_ctrl_handler_setup(&sru->ctrls);
-
 	return sru;
 }