crypto: sun4i-ss - fix large block size support
authorAntoine Ténart <antoine.tenart@free-electrons.com>
Thu, 1 Jun 2017 19:39:03 +0000 (21:39 +0200)
committerHerbert Xu <herbert@gondor.apana.org.au>
Mon, 19 Jun 2017 06:19:52 +0000 (14:19 +0800)
commit049655499e2ecc4d7d3920da44f117e091a2240b
treea3b91f6930729d230f8dfa753cc7eaf17f206cfe
parent0d9c68a9bfc7259f847704f28c64549fc4078aa2
crypto: sun4i-ss - fix large block size support

The run-time self-tests fail quite early, as soon as the input block
size is larger than 64 bytes:

  alg: hash: Test 4 failed for sha1-sun4i-ss
  00000000: b9 c9 1e 52 c0 26 d8 39 81 ff f2 3c 99 b1 27 b2
  00000010: 30 d6 c9 85

One thing to notice is the value of the last word, which is the one
expected (it can sometime be the last two words). The datasheet isn't
very clear about when the digest is ready to retrieve and is seems the
bit SS_DATA_END is cleared when the digest was computed *but* that
doesn't mean the digest is ready to retrieve in the registers.

A ndelay(1) is added before reading the computed digest to ensure it is
available in the SS_MD[] registers.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Acked-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
drivers/crypto/sunxi-ss/sun4i-ss-hash.c