From e1e9733cd37908a9ba61e29154561f0c81420e06 Mon Sep 17 00:00:00 2001
From: Philipp Zabel
Date: Wed, 17 Sep 2014 15:44:54 +0200
Subject: 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 ++++++
1 file changed, 6 insertions(+)
(limited to 'drivers/gpu/ipu-v3/ipu-cpmem.c')
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);
--
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