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Diffstat (limited to 'drivers/media/platform/vsp1/vsp1_uds.c')
-rw-r--r--drivers/media/platform/vsp1/vsp1_uds.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_uds.c b/drivers/media/platform/vsp1/vsp1_uds.c
index c20c84b54936..27012af973b2 100644
--- a/drivers/media/platform/vsp1/vsp1_uds.c
+++ b/drivers/media/platform/vsp1/vsp1_uds.c
@@ -314,13 +314,13 @@ static void uds_configure_partition(struct vsp1_entity *entity,
output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
UDS_PAD_SOURCE);
- /* Input size clipping */
+ /* Input size clipping. */
vsp1_uds_write(uds, dlb, VI6_UDS_HSZCLIP, VI6_UDS_HSZCLIP_HCEN |
(0 << VI6_UDS_HSZCLIP_HCL_OFST_SHIFT) |
(partition->uds_sink.width
<< VI6_UDS_HSZCLIP_HCL_SIZE_SHIFT));
- /* Output size clipping */
+ /* Output size clipping. */
vsp1_uds_write(uds, dlb, VI6_UDS_CLIP_SIZE,
(partition->uds_source.width
<< VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
@@ -342,6 +342,14 @@ static unsigned int uds_max_width(struct vsp1_entity *entity,
UDS_PAD_SOURCE);
hscale = output->width / input->width;
+ /*
+ * The maximum width of the UDS is 304 pixels. These are input pixels
+ * in the event of up-scaling, and output pixels in the event of
+ * downscaling.
+ *
+ * To support overlapping partition windows we clamp at units of 256 and
+ * the remaining pixels are reserved.
+ */
if (hscale <= 2)
return 256;
else if (hscale <= 4)
@@ -366,7 +374,7 @@ static void uds_partition(struct vsp1_entity *entity,
const struct v4l2_mbus_framefmt *output;
const struct v4l2_mbus_framefmt *input;
- /* Initialise the partition state */
+ /* Initialise the partition state. */
partition->uds_sink = *window;
partition->uds_source = *window;