Hi Philipp,
On 06/01/2018 06:13 AM, Philipp Zabel wrote:
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>
---
drivers/gpu/ipu-v3/ipu-cpmem.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c
index 9f2d9ec42add..c1028f38c553 100644
--- a/drivers/gpu/ipu-v3/ipu-cpmem.c
+++ b/drivers/gpu/ipu-v3/ipu-cpmem.c
@@ -269,8 +269,14 @@ EXPORT_SYMBOL_GPL(ipu_cpmem_set_uv_offset);
void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
{
+ u32 ilo;
+
ipu_ch_param_write_field(ch, IPU_FIELD_SO, 1);
- ipu_ch_param_write_field(ch, IPU_FIELD_ILO, stride / 8);
+ if (stride >= 0)
+ ilo = stride / 8;
+ else
+ ilo = 0x100000 - (-stride / 8);
+ ipu_ch_param_write_field(ch, IPU_FIELD_ILO, ilo);
ipu_ch_param_write_field(ch, IPU_FIELD_SLY, (stride * 2) - 1);
This should be "(-stride * 2) - 1" for SLY when stride is negative.
After fixing that, interweaving seq-bt -> interlaced-bt works fine for
packed pixel formats, but there is still some problem for planar.
I haven't tracked down the issue with planar yet, but the corresponding
changes to imx-media that allow interweaving with line swapping are at
e9dd81da20 ("media: imx: Allow interweave with top/bottom lines swapped")
in branch fix-csi-interlaced.3 in my media-tree fork on github. Please
have a
look and let me know if you see anything obvious.
Steve
