From e1e9733cd37908a9ba61e29154561f0c81420e06 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Wed, 17 Sep 2014 15:44:54 +0200 Subject: [PATCH] gpu: ipu-v3: Add support for double read/write reduction Allow to skip writing odd chroma rows by setting the RDRW bit for 4:2:0 chroma subsampled formats for any IDMAC write channel. This also allows to skip reading odd rows for the VDIC read channel. Signed-off-by: Philipp Zabel --- drivers/gpu/ipu-v3/ipu-cpmem.c | 6 ++++++ include/video/imx-ipu-v3.h | 1 + 2 files changed, 7 insertions(+) diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c index 114160dfc3ad..1cb82f445f91 100644 --- a/drivers/gpu/ipu-v3/ipu-cpmem.c +++ b/drivers/gpu/ipu-v3/ipu-cpmem.c @@ -224,6 +224,12 @@ void ipu_cpmem_set_resolution(struct ipuv3_channel *ch, int xres, int yres) } EXPORT_SYMBOL_GPL(ipu_cpmem_set_resolution); +void ipu_cpmem_skip_odd_chroma_rows(struct ipuv3_channel *ch) +{ + ipu_ch_param_write_field(ch, IPU_FIELD_RDRW, 1); +} +EXPORT_SYMBOL_GPL(ipu_cpmem_skip_odd_chroma_rows); + void ipu_cpmem_set_stride(struct ipuv3_channel *ch, int stride) { ipu_ch_param_write_field(ch, IPU_FIELD_SLY, stride - 1); diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h index 8cb07680fb41..ce4c07688b13 100644 --- a/include/video/imx-ipu-v3.h +++ b/include/video/imx-ipu-v3.h @@ -250,6 +250,7 @@ struct ipu_image { void ipu_cpmem_zero(struct ipuv3_channel *ch); void ipu_cpmem_set_resolution(struct ipuv3_channel *ch, int xres, int yres); +void ipu_cpmem_skip_odd_chroma_rows(struct ipuv3_channel *ch); void ipu_cpmem_set_stride(struct ipuv3_channel *ch, int stride); void ipu_cpmem_set_high_priority(struct ipuv3_channel *ch); void ipu_cpmem_set_buffer(struct ipuv3_channel *ch, int bufnum, dma_addr_t buf); -- 2.20.1