From: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
The IPU also supports interlaced buffers that start with the bottom field.
To achieve this, the the base address EBA has to be increased by a stride
length and the interlace offset ILO has to be set to the negative stride.
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
---
drivers/gpu/ipu-v3/ipu-cpmem.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c
index e68e473..8cd9e37 100644
--- a/drivers/gpu/ipu-v3/ipu-cpmem.c
+++ b/drivers/gpu/ipu-v3/ipu-cpmem.c
@@ -269,9 +269,20 @@ EXPORT_SYMBOL_GPL(ipu_cpmem_set_uv_offset);
void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
{
+ u32 ilo, sly;
+
+ if (stride < 0) {
+ stride = -stride;
+ ilo = 0x100000 - (stride / 8);
+ } else {
+ ilo = stride / 8;
+ }
+
+ sly = (stride * 2) - 1;
+
ipu_ch_param_write_field(ch, IPU_FIELD_SO, 1);
- ipu_ch_param_write_field(ch, IPU_FIELD_ILO, stride / 8);
- ipu_ch_param_write_field(ch, IPU_FIELD_SLY, (stride * 2) - 1);
+ ipu_ch_param_write_field(ch, IPU_FIELD_ILO, ilo);
+ ipu_ch_param_write_field(ch, IPU_FIELD_SLY, sly);
};
EXPORT_SYMBOL_GPL(ipu_cpmem_interlaced_scan);
--
2.7.4
