From: Philipp Zabel
Date: Wed, 19 Jul 2017 16:34:20 +0000 (-0400)
Subject: media: imx: csi: enable double write reduction
X-Git-Tag: v4.14-rc6~35^2~445
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=14330d7f08bab92029f0c95c70fe200e8d76b31e;p=platform%2Fkernel%2Flinux-rpi.git
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
Acked-by: Steve Longerbeam
Signed-off-by: Mauro Carvalho Chehab
---
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index a2d2669..f2d64d1 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -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: