crypto: octeontx2 - CN10K CPT to RNM workaround

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When software sets CPT_AF_CTL[RNM_REQ_EN]=1 and RNM in not producing
entropy(i.e., RNM_ENTROPY_STATUS[NORMAL_CNT] < 0x40), the first cycle of
the response may be lost due to a conditional clocking issue. Due to
this, the subsequent random number stream will be corrupted. So, this
patch adds support to ensure RNM_ENTROPY_STATUS[NORMAL_CNT] = 0x40
before writing CPT_AF_CTL[RNM_REQ_EN] = 1, as a workaround.

Signed-off-by: Srujana Challa <schalla@marvell.com>
Signed-off-by: Shijith Thotton <sthotton@marvell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Srujana Challa 2022-01-25 23:56:22 +05:30 • committed by Herbert Xu

parent f4f7c153a6

commit bd9305b0cb

1 changed files with 42 additions and 1 deletions

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drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c

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