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

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

Change-Id: Ia1ac31ffa79a8be2761c243eee9bf87f25422c24
Signed-off-by: Dinesh K Garg <dineshg@codeaurora.org>
This commit is contained in:
Dinesh K Garg 2014-07-25 19:18:06 -07:00 committed by followmsi
parent 969302f5a7
commit 8df7aab686
1 changed files with 35 additions and 0 deletions
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35
drivers/char/hw_random/msm_rng.c
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@ -120,6 +120,12 @@ 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) {
@ -146,6 +152,13 @@ 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;
@ -185,6 +198,13 @@ 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);
@ -216,6 +236,13 @@ 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;
@ -370,6 +397,14 @@ static int __devinit 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;
}