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pipe_crc: Warn if the CRC values is 0xffffffff

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This is what we read when the CRC logic in in a powered down well. We
really don't want that to happen.

In theory, it's possible 0xffffffff to be a valid CRC value, so I don't
assert here.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
This commit is contained in:
Damien Lespiau 2014-07-07 15:16:51 +01:00
parent 4f83c4efa8
commit 09196af60d
1 changed files with 6 additions and 1 deletions
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7
lib/igt_debugfs.c
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@ -199,9 +199,14 @@ bool igt_crc_is_null(igt_crc_t *crc)
{ {
int i; int i;
for (i = 0; i < crc->n_words; i++) for (i = 0; i < crc->n_words; i++) {
if (crc->crc[i] == 0xffffffff)
igt_warn("Suspicious CRC: it looks like the CRC "
"read back was from a register in a powered "
"down well\n");
if (crc->crc[i]) if (crc->crc[i])
return false; return false;
}
return true; return true;
} }