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Subject: media: imx: prpencvf: enable double write reduction
Author: Steve Longerbeam <slongerb...@gmail.com>
Date: Sat Jul 22 17:21:41 2017 -0400
For the write channels with 4:2:0 subsampled YUV formats, avoid chroma
overdraw by only writing chroma for even lines. Reduces necessary write
memory bandwidth by at least 25% (more with rotation enabled).
Signed-off-by: Steve Longerbeam <steve_longerb...@mentor.com>
Acked-by: Philipp Zabel <p.za...@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
drivers/staging/media/imx/imx-ic-prpencvf.c | 11 +++++++++++
1 file changed, 11 insertions(+)
---
diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c
b/drivers/staging/media/imx/imx-ic-prpencvf.c
index ed363fe3b3d0..42c5045e397e 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -374,6 +374,17 @@ static int prp_setup_channel(struct prp_priv *priv,
image.phys0 = addr0;
image.phys1 = addr1;
+ if (channel == priv->out_ch || channel == priv->rot_out_ch) {
+ switch (image.pix.pixelformat) {
+ case V4L2_PIX_FMT_YUV420:
+ case V4L2_PIX_FMT_YVU420:
+ case V4L2_PIX_FMT_NV12:
+ /* Skip writing U and V components to odd rows */
+ ipu_cpmem_skip_odd_chroma_rows(channel);
+ break;
+ }
+ }
+
ret = ipu_cpmem_set_image(channel, &image);
if (ret)
return ret;
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