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[98.219.206.88]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7a806bfb8c9sm564737185a.25.2024.09.03.14.22.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Sep 2024 14:22:44 -0700 (PDT) From: Brian Masney To: herbert@gondor.apana.org.au Cc: davem@davemloft.net, quic_omprsing@quicinc.com, neil.armstrong@linaro.org, quic_bjorande@quicinc.com, linux-arm-msm@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, ernesto.mnd.fernandez@gmail.com, quic_jhugo@quicinc.com Subject: [PATCH v2 1/2] crypto: qcom-rng: fix support for ACPI-based systems Date: Tue, 3 Sep 2024 17:22:19 -0400 Message-ID: <20240903212230.707376-2-bmasney@redhat.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240903212230.707376-1-bmasney@redhat.com> References: <20240903212230.707376-1-bmasney@redhat.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-type: text/plain The qcom-rng driver supports both ACPI and device tree based systems. ACPI support was broken when the hw_random interface support was added. Let's go ahead and fix this by adding a check for has_acpi_companion(). This fix was boot tested on a Qualcomm Amberwing server. Fixes: f29cd5bb64c2 ("crypto: qcom-rng - Add hw_random interface support") Reported-by: Ernesto A. Fernández Closes: https://lore.kernel.org/linux-arm-msm/20240828184019.GA21181@eaf/ Cc: stable@vger.kernel.org Signed-off-by: Brian Masney --- Note: I looked at updating the struct qcom_rng_acpi_match to have driver_data point to &qcom_prng_ee_of_data, however that won't work since struct acpi_device_id has a driver_data member of type kernel_ulong_t. struct of_device_id has the data member set to type const void *. As I get available time, I'll look to see if it's possible to migrate struct acpi_device_id.driver_data from a kernel_ulong_t to a const void * to match what's done in struct of_device_id. That will allow removing the has_acpi_companion() check in the future. I suspect that change is not going to be trivial though. drivers/crypto/qcom-rng.c | 35 +++++++++++++++++++---------------- 1 file changed, 19 insertions(+), 16 deletions(-) diff --git a/drivers/crypto/qcom-rng.c b/drivers/crypto/qcom-rng.c index c670d7d0c11e..7ba978f0ce8b 100644 --- a/drivers/crypto/qcom-rng.c +++ b/drivers/crypto/qcom-rng.c @@ -176,6 +176,21 @@ static struct rng_alg qcom_rng_alg = { } }; +static struct qcom_rng_of_data qcom_prng_of_data = { + .skip_init = false, + .hwrng_support = false, +}; + +static struct qcom_rng_of_data qcom_prng_ee_of_data = { + .skip_init = true, + .hwrng_support = false, +}; + +static struct qcom_rng_of_data qcom_trng_of_data = { + .skip_init = true, + .hwrng_support = true, +}; + static int qcom_rng_probe(struct platform_device *pdev) { struct qcom_rng *rng; @@ -196,7 +211,10 @@ static int qcom_rng_probe(struct platform_device *pdev) if (IS_ERR(rng->clk)) return PTR_ERR(rng->clk); - rng->of_data = (struct qcom_rng_of_data *)of_device_get_match_data(&pdev->dev); + if (has_acpi_companion(&pdev->dev)) + rng->of_data = &qcom_prng_ee_of_data; + else + rng->of_data = (struct qcom_rng_of_data *)of_device_get_match_data(&pdev->dev); qcom_rng_dev = rng; ret = crypto_register_rng(&qcom_rng_alg); @@ -231,21 +249,6 @@ static void qcom_rng_remove(struct platform_device *pdev) qcom_rng_dev = NULL; } -static struct qcom_rng_of_data qcom_prng_of_data = { - .skip_init = false, - .hwrng_support = false, -}; - -static struct qcom_rng_of_data qcom_prng_ee_of_data = { - .skip_init = true, - .hwrng_support = false, -}; - -static struct qcom_rng_of_data qcom_trng_of_data = { - .skip_init = true, - .hwrng_support = true, -}; - static const struct acpi_device_id __maybe_unused qcom_rng_acpi_match[] = { { .id = "QCOM8160", .driver_data = 1 }, {}