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hwrng: imx-rngc - add quality to use it as kernel entropy pool

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The RNGB can generate 2^20 words (1 word == 4 byte) of 'random' data
after the seed pool was initialized. The pool needs to be reseeded if
more words are required. The reseeding is done automatically since
commit 3acd9ea933 ("hwrng: imx-rngc - use automatic seeding").

We can't retrieve the TRNG values directly so we need a other way to get
the quality level. We know that the PRNG uses 20.000 entropy samples
from the TRNG to generate 2^20 words (1MiB) and the quality level is
defined as (in bits of entropy per 1024 bits of input). So the quality
level can be calculated by:

   20.000 * 1024
   ------------- = ~ 19.5
        2^20

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Marco Felsch 2020-08-31 16:00:42 +02:00 committed by Herbert Xu
parent 45cb6653b0
commit 9769635423
1 changed files with 1 additions and 0 deletions
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drivers/char/hw_random/imx-rngc.c
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@ -285,6 +285,7 @@ static int imx_rngc_probe(struct platform_device *pdev)
rngc->rng.init = imx_rngc_init;
rngc->rng.read = imx_rngc_read;
rngc->rng.cleanup = imx_rngc_cleanup;
rngc->rng.quality = 19;
rngc->dev = &pdev->dev;
platform_set_drvdata(pdev, rngc);