diff options
| author | Samuel Holland <samuel@sholland.org> | 2022-12-31 16:01:44 -0600 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2023-01-13 16:39:04 +0800 |
| commit | f81c1d4a6d3f6b9f31cb8feec13a4357b68a95d6 (patch) | |
| tree | 0b1bf5dedb1d3148cfe6c1bee1ad259599905a68 /drivers | |
| parent | 197286f86012250191bfe616dc4e9b8e34380c35 (diff) | |
crypto: sun8i-ce - Add TRNG clock to the D1 variant
At least the D1 variant requires a separate clock for the TRNG.
Without this clock enabled, reading from /dev/hwrng reports:
sun8i-ce 3040000.crypto: DMA timeout for TRNG (tm=96) on flow 3
Experimentation shows that the necessary clock is the SoC's internal
RC oscillator. This makes sense, as noise from the oscillator can be
used as a source of entropy.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Acked-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/crypto/allwinner/sun8i-ce/sun8i-ce-core.c | 1 | ||||
| -rw-r--r-- | drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h | 2 |
2 files changed, 2 insertions, 1 deletions
diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-core.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-core.c index 9f6594699835..a6865ff4d400 100644 --- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-core.c +++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-core.c @@ -118,6 +118,7 @@ static const struct ce_variant ce_d1_variant = { { "bus", 0, 200000000 }, { "mod", 300000000, 0 }, { "ram", 0, 400000000 }, + { "trng", 0, 0 }, }, .esr = ESR_D1, .prng = CE_ALG_PRNG, diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h index 8177aaba4434..27029fb77e29 100644 --- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h +++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h @@ -105,7 +105,7 @@ #define MAX_SG 8 -#define CE_MAX_CLOCKS 3 +#define CE_MAX_CLOCKS 4 #define MAXFLOW 4 |