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[82.149.19.102]) by smtp.gmail.com with ESMTPSA id z1-20020adfdf81000000b00268aae5fb5bsm36862776wrl.3.2023.01.05.08.29.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Jan 2023 08:29:35 -0800 (PST) From: Jernej =?utf-8?B?xaBrcmFiZWM=?= To: Corentin Labbe , Herbert Xu , "David S . Miller" , Chen-Yu Tsai , Krzysztof Kozlowski , Rob Herring , Samuel Holland Cc: Samuel Holland , Albert Ou , Conor Dooley , Palmer Dabbelt , Paul Walmsley , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sunxi@lists.linux.dev Subject: Re: [PATCH v2 2/3] crypto: sun8i-ce - Add TRNG clock to the D1 variant Date: Thu, 05 Jan 2023 17:29:34 +0100 Message-ID: <3212177.44csPzL39Z@jernej-laptop> In-Reply-To: <20221231220146.646-3-samuel@sholland.org> References: <20221231220146.646-1-samuel@sholland.org> <20221231220146.646-3-samuel@sholland.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230105_162932_575488_28FE8374 X-CRM114-Status: UNSURE ( 9.61 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Dne sobota, 31. december 2022 ob 23:01:44 CET je Samuel Holland napisal(a): > 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 Reviewed-by: Jernej Skrabec Best regards, Jernej _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel