Re: R600 definition error for interrupt handler swap

On Don, 2012-02-02 at 09:42 +0100, Cédric Cano wrote:

We try to use the Linux 3.0.0 on our PowerPC board and M96 GPU (RV730): it doesn't work as is. We need to revert this definition like it was before 2.6.39.4 (http://lists.freedesktop.org/archives/dri-devel/2011-July/012811.html).

I suspect you may be tripping over the double byte-swapping fixed by commit df07d6999e4e502ff474eeafe11ea0055f4cd68d ('drm/radeon: Writeback endian fixes'). By using the wrong definition of IH_MC_SWAP, you'd accidentally disable the GPU byte swapping, making the CPU byte swapping work correctly.