[media] v4l: vsp1: wpf: Add flipping support

Vertical flipping is available on both Gen2 and Gen3, while horizontal
flipping is only available on Gen3.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

1 files changed, 139 insertions, 6 deletions

diff --git a/drivers/media/platform/vsp1/vsp1_wpf.c b/drivers/media/platform/vsp1/vsp1_wpf.c
index 9385bc703dcd..31983169c24a 100644
--- a/drivers/media/platform/vsp1/vsp1_wpf.c
+++ b/drivers/media/platform/vsp1/vsp1_wpf.c
@@ -37,6 +37,97 @@ static inline void vsp1_wpf_write(struct vsp1_rwpf *wpf,
 }
 
 /* -----------------------------------------------------------------------------
+ * Controls
+ */
+
+enum wpf_flip_ctrl {
+	WPF_CTRL_VFLIP = 0,
+	WPF_CTRL_HFLIP = 1,
+	WPF_CTRL_MAX,
+};
+
+static int vsp1_wpf_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct vsp1_rwpf *wpf =
+		container_of(ctrl->handler, struct vsp1_rwpf, ctrls);
+	unsigned int i;
+	u32 flip = 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_HFLIP:
+	case V4L2_CID_VFLIP:
+		for (i = 0; i < WPF_CTRL_MAX; ++i) {
+			if (wpf->flip.ctrls[i])
+				flip |= wpf->flip.ctrls[i]->val ? BIT(i) : 0;
+		}
+
+		spin_lock_irq(&wpf->flip.lock);
+		wpf->flip.pending = flip;
+		spin_unlock_irq(&wpf->flip.lock);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_ctrl_ops vsp1_wpf_ctrl_ops = {
+	.s_ctrl = vsp1_wpf_s_ctrl,
+};
+
+static int wpf_init_controls(struct vsp1_rwpf *wpf)
+{
+	struct vsp1_device *vsp1 = wpf->entity.vsp1;
+	unsigned int num_flip_ctrls;
+
+	spin_lock_init(&wpf->flip.lock);
+
+	if (wpf->entity.index != 0) {
+		/* Only WPF0 supports flipping. */
+		num_flip_ctrls = 0;
+	} else if (vsp1->info->features & VSP1_HAS_WPF_HFLIP) {
+		/* When horizontal flip is supported the WPF implements two
+		 * controls (horizontal flip and vertical flip).
+		 */
+		num_flip_ctrls = 2;
+	} else if (vsp1->info->features & VSP1_HAS_WPF_VFLIP) {
+		/* When only vertical flip is supported the WPF implements a
+		 * single control (vertical flip).
+		 */
+		num_flip_ctrls = 1;
+	} else {
+		/* Otherwise flipping is not supported. */
+		num_flip_ctrls = 0;
+	}
+
+	vsp1_rwpf_init_ctrls(wpf, num_flip_ctrls);
+
+	if (num_flip_ctrls >= 1) {
+		wpf->flip.ctrls[WPF_CTRL_VFLIP] =
+			v4l2_ctrl_new_std(&wpf->ctrls, &vsp1_wpf_ctrl_ops,
+					  V4L2_CID_VFLIP, 0, 1, 1, 0);
+	}
+
+	if (num_flip_ctrls == 2) {
+		wpf->flip.ctrls[WPF_CTRL_HFLIP] =
+			v4l2_ctrl_new_std(&wpf->ctrls, &vsp1_wpf_ctrl_ops,
+					  V4L2_CID_HFLIP, 0, 1, 1, 0);
+
+		v4l2_ctrl_cluster(2, wpf->flip.ctrls);
+	}
+
+	if (wpf->ctrls.error) {
+		dev_err(vsp1->dev, "wpf%u: failed to initialize controls\n",
+			wpf->entity.index);
+		return wpf->ctrls.error;
+	}
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
  * V4L2 Subdevice Core Operations
  */
 
@@ -85,10 +176,32 @@ static void vsp1_wpf_destroy(struct vsp1_entity *entity)
 static void wpf_set_memory(struct vsp1_entity *entity, struct vsp1_dl_list *dl)
 {
 	struct vsp1_rwpf *wpf = entity_to_rwpf(entity);
+	const struct v4l2_pix_format_mplane *format = &wpf->format;
+	struct vsp1_rwpf_memory mem = wpf->mem;
+	unsigned int flip = wpf->flip.active;
+	unsigned int offset;
+
+	/* Update the memory offsets based on flipping configuration. The
+	 * destination addresses point to the locations where the VSP starts
+	 * writing to memory, which can be different corners of the image
+	 * depending on vertical flipping. Horizontal flipping is handled
+	 * through a line buffer and doesn't modify the start address.
+	 */
+	if (flip & BIT(WPF_CTRL_VFLIP)) {
+		mem.addr[0] += (format->height - 1)
+			     * format->plane_fmt[0].bytesperline;
+
+		if (format->num_planes > 1) {
+			offset = (format->height / wpf->fmtinfo->vsub - 1)
+			       * format->plane_fmt[1].bytesperline;
+			mem.addr[1] += offset;
+			mem.addr[2] += offset;
+		}
+	}
 
-	vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_ADDR_Y, wpf->mem.addr[0]);
-	vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_ADDR_C0, wpf->mem.addr[1]);
-	vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_ADDR_C1, wpf->mem.addr[2]);
+	vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_ADDR_Y, mem.addr[0]);
+	vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_ADDR_C0, mem.addr[1]);
+	vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_ADDR_C1, mem.addr[2]);
 }
 
 static void wpf_configure(struct vsp1_entity *entity,
@@ -105,8 +218,22 @@ static void wpf_configure(struct vsp1_entity *entity,
 	u32 srcrpf = 0;
 
 	if (!full) {
-		vsp1_wpf_write(wpf, dl, VI6_WPF_OUTFMT, wpf->outfmt |
-			       (wpf->alpha << VI6_WPF_OUTFMT_PDV_SHIFT));
+		const unsigned int mask = BIT(WPF_CTRL_VFLIP)
+					| BIT(WPF_CTRL_HFLIP);
+
+		spin_lock(&wpf->flip.lock);
+		wpf->flip.active = (wpf->flip.active & ~mask)
+				 | (wpf->flip.pending & mask);
+		spin_unlock(&wpf->flip.lock);
+
+		outfmt = (wpf->alpha << VI6_WPF_OUTFMT_PDV_SHIFT) | wpf->outfmt;
+
+		if (wpf->flip.active & BIT(WPF_CTRL_VFLIP))
+			outfmt |= VI6_WPF_OUTFMT_FLP;
+		if (wpf->flip.active & BIT(WPF_CTRL_HFLIP))
+			outfmt |= VI6_WPF_OUTFMT_HFLP;
+
+		vsp1_wpf_write(wpf, dl, VI6_WPF_OUTFMT, outfmt);
 		return;
 	}
 
@@ -149,6 +276,12 @@ static void wpf_configure(struct vsp1_entity *entity,
 				       format->plane_fmt[1].bytesperline);
 
 		vsp1_wpf_write(wpf, dl, VI6_WPF_DSWAP, fmtinfo->swap);
+
+		if (vsp1->info->features & VSP1_HAS_WPF_HFLIP &&
+		    wpf->entity.index == 0)
+			vsp1_wpf_write(wpf, dl, VI6_WPF_ROT_CTRL,
+				       VI6_WPF_ROT_CTRL_LN16 |
+				       (256 << VI6_WPF_ROT_CTRL_LMEM_WD_SHIFT));
 	}
 
 	if (sink_format->code != source_format->code)
@@ -234,7 +367,7 @@ struct vsp1_rwpf *vsp1_wpf_create(struct vsp1_device *vsp1, unsigned int index)
 	}
 
 	/* Initialize the control handler. */
-	ret = vsp1_rwpf_init_ctrls(wpf);
+	ret = wpf_init_controls(wpf);
 	if (ret < 0) {
 		dev_err(vsp1->dev, "wpf%u: failed to initialize controls\n",
 			index);