Merge "msm_rng: Enable/ Disable Bus bandwidth for every RNG read call" (1342ab5f) · Commits · e / devices / android_kernel_sony_msm8994

drivers/char/hw_random/msm_rng.c

+35 −0

Original line number	Diff line number	Diff line
		@@ -119,6 +119,12 @@ int msm_rng_direct_read(struct msm_rng_device msm_rng_dev, void data)
		pdev = msm_rng_dev->pdev;
		base = msm_rng_dev->base;

		if (msm_rng_dev->qrng_perf_client) {
		ret = msm_bus_scale_client_update_request(
		msm_rng_dev->qrng_perf_client, 1);
		if (ret)
		pr_err("bus_scale_client_update_req failed!\n");
		}
		/* enable PRNG clock */
		ret = clk_prepare_enable(msm_rng_dev->prng_clk);
		if (ret) {
		@@ -145,6 +151,13 @@ int msm_rng_direct_read(struct msm_rng_device msm_rng_dev, void data)
		/* vote to turn off clock */
		clk_disable_unprepare(msm_rng_dev->prng_clk);

		if (msm_rng_dev->qrng_perf_client) {
		ret = msm_bus_scale_client_update_request(
		msm_rng_dev->qrng_perf_client, 0);
		if (ret)
		pr_err("bus_scale_client_update_req failed!\n");
		}

		val = 0L;
		return currsize;

		@@ -184,6 +197,13 @@ static int msm_rng_drbg_read(struct hwrng *rng,
		} else
		ret1 = 1;

		if (msm_rng_dev->qrng_perf_client) {
		ret = msm_bus_scale_client_update_request(
		msm_rng_dev->qrng_perf_client, 1);
		if (ret)
		pr_err("bus_scale_client_update_req failed!\n");
		}

		/* read random data from h/w */
		/* enable PRNG clock */
		ret = clk_prepare_enable(msm_rng_dev->prng_clk);
		@@ -215,6 +235,13 @@ static int msm_rng_drbg_read(struct hwrng *rng,
		/* vote to turn off clock */
		clk_disable_unprepare(msm_rng_dev->prng_clk);

		if (msm_rng_dev->qrng_perf_client) {
		ret = msm_bus_scale_client_update_request(
		msm_rng_dev->qrng_perf_client, 0);
		if (ret)
		pr_err("bus_scale_client_update_req failed!\n");
		}

		up(&msm_rng_dev->drbg_sem);

		return currsize;
		@@ -369,6 +396,14 @@ static int msm_rng_enable_hw(struct msm_rng_device *msm_rng_dev)
		mb();
		}
		clk_disable_unprepare(msm_rng_dev->prng_clk);

		if (msm_rng_dev->qrng_perf_client) {
		ret = msm_bus_scale_client_update_request(
		msm_rng_dev->qrng_perf_client, 0);
		if (ret)
		pr_err("bus_scale_client_update_req failed!\n");
		}

		return 0;
		}