[Bug 66932] Screen corruption on Cayman with dpm enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66932

--- Comment #21 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #19)
> I wasn't very clear in my #12 comment, but what I was trying to say it is
> something fishy about "reg_block->asRegIndexBuf". It is defined in
> atombios.h as:
> ATOM_MEMORY_SETTING_DATA_BLOCK  asRegDataBuf[1];
>

It's a variably sized array and the size varies depending on the system.  The
size of that array is defined by usRegIndexTblSize.  Hence the calculation to
determine the number of elements:

num_entries = (u8)((le16_to_cpu(reg_block->usRegIndexTblSize)) /
sizeof(ATOM_INIT_REG_INDEX_FORMAT)) - 1;

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