diff mbox series

[v1] PM / devfreq: tegra30: Improve initial hardware resetting

Message ID 20200927205139.19548-1-digetx@gmail.com
State New
Headers show
Series [v1] PM / devfreq: tegra30: Improve initial hardware resetting | expand

Commit Message

Dmitry Osipenko Sept. 27, 2020, 8:51 p.m. UTC
It's safe to enable the ACTMON clock at any time during driver probing,
even if we don't know the state of hardware, because it's used only for
collecting and processing stats, and interrupt is kept disabled. This
allows us to slightly improve code which performs initial hardware
resetting by making use of a single reset_control_reset() instead of
assert/deassert pair. Secondly, a potential error of the reset-control
API is handled nicely now.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/devfreq/tegra30-devfreq.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

Comments

Chanwoo Choi Sept. 28, 2020, 3:20 a.m. UTC | #1
On 9/28/20 5:51 AM, Dmitry Osipenko wrote:
> It's safe to enable the ACTMON clock at any time during driver probing,
> even if we don't know the state of hardware, because it's used only for
> collecting and processing stats, and interrupt is kept disabled. This
> allows us to slightly improve code which performs initial hardware
> resetting by making use of a single reset_control_reset() instead of
> assert/deassert pair. Secondly, a potential error of the reset-control
> API is handled nicely now.
> 
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>  drivers/devfreq/tegra30-devfreq.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
> index dedd39de7367..f5e74c2ede85 100644
> --- a/drivers/devfreq/tegra30-devfreq.c
> +++ b/drivers/devfreq/tegra30-devfreq.c
> @@ -822,8 +822,6 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
>  		return err;
>  	}
>  
> -	reset_control_assert(tegra->reset);
> -
>  	err = clk_prepare_enable(tegra->clock);
>  	if (err) {
>  		dev_err(&pdev->dev,
> @@ -831,7 +829,11 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
>  		return err;
>  	}
>  
> -	reset_control_deassert(tegra->reset);
> +	err = reset_control_reset(tegra->reset);
> +	if (err) {
> +		dev_err(&pdev->dev, "Failed to reset hardware: %d\n", err);
> +		goto disable_clk;
> +	}
>  
>  	rate = clk_round_rate(tegra->emc_clock, ULONG_MAX);
>  	if (rate < 0) {
> 

Applied it. Thanks.
diff mbox series

Patch

diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index dedd39de7367..f5e74c2ede85 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -822,8 +822,6 @@  static int tegra_devfreq_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	reset_control_assert(tegra->reset);
-
 	err = clk_prepare_enable(tegra->clock);
 	if (err) {
 		dev_err(&pdev->dev,
@@ -831,7 +829,11 @@  static int tegra_devfreq_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	reset_control_deassert(tegra->reset);
+	err = reset_control_reset(tegra->reset);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to reset hardware: %d\n", err);
+		goto disable_clk;
+	}
 
 	rate = clk_round_rate(tegra->emc_clock, ULONG_MAX);
 	if (rate < 0) {