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media: imx: csi: enable double write reduction 

For 4:2:0 subsampled YUV formats, avoid chroma overdraw by only writing
chroma for even lines. Reduces necessary write memory bandwidth by 25%.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Philipp Zabel 2017-07-19 12:34:20 -04:00 committed by Mauro Carvalho Chehab
parent 9e6b1dae37
commit 14330d7f08
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/media/imx/imx-media-csi.c
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@ -357,6 +357,8 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
passthrough = (sensor_ep->bus_type != V4L2_MBUS_CSI2 &&
sensor_ep->bus.parallel.bus_width >= 16);
passthrough_bits = 16;
/* Skip writing U and V components to odd rows */
ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
break;
case V4L2_PIX_FMT_YUYV:
case V4L2_PIX_FMT_UYVY: