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| author | Steve Longerbeam <slongerbeam@gmail.com> | 2019-06-13 18:02:55 -0700 |
|---|---|---|
| committer | Philipp Zabel <p.zabel@pengutronix.de> | 2019-06-14 15:33:02 +0200 |
| commit | fee77829083ad70845bd650f3c84c5900c5abae1 (patch) | |
| tree | 74a839ba7f556df2fbd745845303546c558279a3 | |
| parent | 4791bd7d6adc406e12e4f69588ef201d39c3d8ac (diff) | |
gpu: ipu-v3: image-convert: Enable double write reduction
For the write channels with 4:2:0 subsampled YUV formats, avoid chroma
overdraw by only writing chroma for even lines (skip odd chroma rows).
This reduces necessary write memory bandwidth by at least 25% (more
with rotation enabled).
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
| -rw-r--r-- | drivers/gpu/ipu-v3/ipu-image-convert.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/ipu-v3/ipu-image-convert.c b/drivers/gpu/ipu-v3/ipu-image-convert.c index d2457fde25fa..61643382bbde 100644 --- a/drivers/gpu/ipu-v3/ipu-image-convert.c +++ b/drivers/gpu/ipu-v3/ipu-image-convert.c @@ -1280,6 +1280,15 @@ static void init_idmac_channel(struct ipu_image_convert_ctx *ctx, if (rot_mode) ipu_cpmem_set_rotation(channel, rot_mode); + /* + * Skip writing U and V components to odd rows in the output + * channels for planar 4:2:0. + */ + if ((channel == chan->out_chan || + channel == chan->rotation_out_chan) && + image->fmt->planar && image->fmt->uv_height_dec == 2) + ipu_cpmem_skip_odd_chroma_rows(channel); + if (channel == chan->rotation_in_chan || channel == chan->rotation_out_chan) { burst_size = 8; |