linux-kernel - [PATCH 2/2] hwrng: exynos

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Message-Id: <20200514190734.32746-3-l.stelmach@samsung.com>
Date:   Thu, 14 May 2020 21:07:34 +0200
From:   Łukasz Stelmach <l.stelmach@...sung.com>
To:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Markus Elfring <elfring@...rs.sourceforge.net>,
        Matthias Brugger <mbrugger@...e.com>,
        Stefan Wahren <wahrenst@....net>, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Łukasz Stelmach <l.stelmach@...sung.com>
Subject: [PATCH 2/2] hwrng: exynos - Set the quality value

The value has been estimaded by obtainig 1024 chunks of data 128 bytes
(1024 bits) each from the generator and finding chunk with minimal
entropy using the ent(1) tool. The value was 6.332937 bits of entropy
in each 8 bits of data.

Signed-off-by: Łukasz Stelmach <l.stelmach@...sung.com>
---
 drivers/char/hw_random/exynos-trng.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c
index 8e1fe3f8dd2d..ff6739272bf5 100644
--- a/drivers/char/hw_random/exynos-trng.c
+++ b/drivers/char/hw_random/exynos-trng.c
@@ -123,6 +123,7 @@ static int exynos_trng_probe(struct platform_device *pdev)
 	trng->rng.init = exynos_trng_init;
 	trng->rng.read = exynos_trng_do_read;
 	trng->rng.priv = (unsigned long) trng;
+	trng->rng.quality = 800;
 
 	platform_set_drvdata(pdev, trng);
 	trng->dev = &pdev->dev;
-- 
2.25.0