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 <p.zabel@pengutronix.de>
Allyn69 · Jun 8, 2017 · e1e9733 · e1e9733
1 parent 16e9ab8
commit e1e9733
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diff --git 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
@@ -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);