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@xxxxxxxxxxxxxx>
---
drivers/staging/media/imx/imx-media-csi.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index a2d26693912ec..0fb70d5a9e7fe 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -388,6 +388,12 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
goto unsetup_vb2;
}
+ switch (image.pix.pixelformat) {
+ case V4L2_PIX_FMT_YUV420:
+ case V4L2_PIX_FMT_NV12:
+ ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
+ }
+
ipu_cpmem_set_burstsize(priv->idmac_ch, burst_size);
/*
--
2.11.0
