[PATCH 1/4] crypto: qcom-rng - Enable clock in hwrng case

[Eric Biggers]

Fix qcom-rng.c to enable the clock before accessing the hardware.

Fixes: f29cd5bb64c2 ("crypto: qcom-rng - Add hw_random interface support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
 drivers/crypto/qcom-rng.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/crypto/qcom-rng.c b/drivers/crypto/qcom-rng.c
index 150e5802e351..f31a7fe07ba7 100644
--- a/drivers/crypto/qcom-rng.c
+++ b/drivers/crypto/qcom-rng.c
@@ -111,17 +111,31 @@ static int qcom_rng_seed(struct crypto_rng *tfm, const u8 *seed,
 			 unsigned int slen)
 {
 	return 0;
 }
 
+static int qcom_hwrng_init(struct hwrng *hwrng)
+{
+	struct qcom_rng *qrng = container_of(hwrng, struct qcom_rng, hwrng);
+
+	return clk_prepare_enable(qrng->clk);
+}
+
 static int qcom_hwrng_read(struct hwrng *hwrng, void *data, size_t max, bool wait)
 {
 	struct qcom_rng *qrng = container_of(hwrng, struct qcom_rng, hwrng);
 
 	return qcom_rng_read(qrng, data, max);
 }
 
+static void qcom_hwrng_cleanup(struct hwrng *hwrng)
+{
+	struct qcom_rng *qrng = container_of(hwrng, struct qcom_rng, hwrng);
+
+	clk_disable_unprepare(qrng->clk);
+}
+
 static int qcom_rng_enable(struct qcom_rng *rng)
 {
 	u32 val;
 	int ret;
 
@@ -206,11 +220,13 @@ static int qcom_rng_probe(struct platform_device *pdev)
 		return ret;
 	}
 
 	if (rng->match_data->hwrng_support) {
 		rng->hwrng.name = "qcom_hwrng";
+		rng->hwrng.init = qcom_hwrng_init;
 		rng->hwrng.read = qcom_hwrng_read;
+		rng->hwrng.cleanup = qcom_hwrng_cleanup;
 		rng->hwrng.quality = QCOM_TRNG_QUALITY;
 		ret = devm_hwrng_register(&pdev->dev, &rng->hwrng);
 		if (ret) {
 			dev_err(&pdev->dev, "Register hwrng failed: %d\n", ret);
 			qcom_rng_dev = NULL;
-- 
2.54.0