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Commit bb004d0f authored by Dinesh K Garg's avatar Dinesh K Garg
Browse files

msm_rng: Enable/ Disable Bus bandwidth for every RNG read call 



This patch adds calls to enable and disable bus bandwidth
for every RNG Read call.

Change-Id: Ia1ac31ffa79a8be2761c243eee9bf87f25422c24
Signed-off-by: default avatarDinesh K Garg <dineshg@codeaurora.org>
parent e77d5022

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;

}