| Message ID | 1445011311-32142-1-git-send-email-daniel.thompson@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 17.10.2015 01:01, Daniel Thompson wrote: > Currently this driver calls pm_runtime_get_sync() rampantly > but never puts anything back. This makes it impossible for the > device to autosuspend properly; it will remain fully active > after the first use. > > Fix in the obvious way. > > Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> > Cc: Kukjin Kim <kgene@kernel.org> > Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com> > --- > > Notes: > Compile tested only (CONFIG_PM=y, CONFIG_HW_RANDOM_EXYNOS=m); I spotted > this whilst reviewing the code and don't have an exynos platform to > test on. > > drivers/char/hw_random/exynos-rng.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) To test the patch I had to add OF support to the driver. I have these patches almost ready and I will send them soon. Anyway: Tested on Trats2 board (Exynos4412): Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Best regards, Krzysztof
On Fri, Oct 16, 2015 at 05:01:51PM +0100, Daniel Thompson wrote: > Currently this driver calls pm_runtime_get_sync() rampantly > but never puts anything back. This makes it impossible for the > device to autosuspend properly; it will remain fully active > after the first use. > > Fix in the obvious way. > > Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> > Cc: Kukjin Kim <kgene@kernel.org> > Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com> Patch applied. Thanks.
diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c index dc4701fd814f..73318e2a34dd 100644 --- a/drivers/char/hw_random/exynos-rng.c +++ b/drivers/char/hw_random/exynos-rng.c @@ -95,7 +95,7 @@ static int exynos_read(struct hwrng *rng, void *buf, *data = exynos_rng_readl(exynos_rng, EXYNOS_PRNG_OUT1_OFFSET); pm_runtime_mark_last_busy(exynos_rng->dev); - pm_runtime_autosuspend(exynos_rng->dev); + pm_runtime_put_sync_autosuspend(exynos_rng->dev); return 4; }
Currently this driver calls pm_runtime_get_sync() rampantly but never puts anything back. This makes it impossible for the device to autosuspend properly; it will remain fully active after the first use. Fix in the obvious way. Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> Cc: Kukjin Kim <kgene@kernel.org> Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com> --- Notes: Compile tested only (CONFIG_PM=y, CONFIG_HW_RANDOM_EXYNOS=m); I spotted this whilst reviewing the code and don't have an exynos platform to test on. drivers/char/hw_random/exynos-rng.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 2.4.3