On 2012-12-19 14:19, Archit Taneja wrote: >> The image I get is stable, and clearly something that happens when, say, >> row_inc is one pixel too much, or similar. > > Ok, about the width in this case. The original width is 400, and what we > finally want is 220. After pre-decimation, the width would become 200, > and we would need our scalar to actually upscale to 220. > > I am wondering if the driver gets confused when such a scenario occurs, > or the DSS HW is weird when we upscale some predecimated content. If you > look at the hinc(1024 * width/out_width) value in the FIR register, in > the "ok" regdumps, the value is 1861, which points to downscaling. And > in the fail case, it's 92, which is upscaling. I can reproduce this with a very simple case. 400x200 -> 200x200, and forcing horizontal predecimation. So this will cause no scaling to be used, only the pixel_inc is used to downscale. The VID1 registers are as follows. They look right to me... DISPC_OVL_BA0(VID1) 8d900000 DISPC_OVL_BA1(VID1) 8d900000 DISPC_OVL_POSITION(VID1) 00000000 DISPC_OVL_SIZE(VID1) 00c700c7 DISPC_OVL_ATTRIBUTES(VID1) 00608011 DISPC_OVL_FIFO_THRESHOLD(VID1) 03ff03c0 DISPC_OVL_FIFO_SIZE_STATUS(VID1) 00000400 DISPC_OVL_ROW_INC(VID1) 00000001 DISPC_OVL_PIXEL_INC(VID1) 00000005 DISPC_OVL_PRELOAD(VID1) 00000100 DISPC_OVL_FIR(VID1) 04000400 DISPC_OVL_PICTURE_SIZE(VID1) 00c700c7 DISPC_OVL_ACCU0(VID1) 00000000 DISPC_OVL_ACCU1(VID1) 00000000 DISPC_OVL_PRELOAD(VID1) 00000100 Tomi
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