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.lesp...@intel.com>
---
lib/igt_debugfs.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index 2f655a1..5c4bbc5 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -199,9 +199,14 @@ bool igt_crc_is_null(igt_crc_t *crc)
{
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])
return false;
+ }
return true;
}
--
1.8.3.1
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