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Writeback - linux 3.4.27 crash when TRUNCATIONENABLE is set

Grzegorz Bieski
Prodigy 30 points
Other Parts Discussed in Thread: 4430

Hello,

I'm still trying to bring up writeback driver  for OMAP 4430  (http://e2e.ti.com/support/omap/f/849/p/255888/896233.aspx#896233) for kernel 3.4.27 . I'm trying to grab image from LCD in ARGB32 format. I have two scenarios:
  1.  When TRUNCATIONENABLE bit in  DISPC_WB_ATTRIBUTES is set and I'm enabling writeback, I have SYNC_LOST interrupt
  2. When TRUNCATIONENABLE bit in  DISPC_WB_ATTRIBUTES is reset and I'm enabling writeback, I have instant kernel crash, unfortunately  without any message on serial console.

When I was comparing register settings with working driver for kernel ti-ubuntu-2.6.35-991.5, truncation was disabled for ARGB32 format. I compared register settings of DISPC between two kernels (3.4 and 2.6) and I haven't noticed any significant differences.

Can anyone explain me the reason?

Regards,
Grzegorz