[PATCH] drm/lima: Fix dev_pm_opp_set_config in case of missing regulator

[PATCH] drm/lima: Fix dev_pm_opp_set_config in case of missing regulator

[Erico Nunes]

Commit d8c32d3971e4 ("drm/lima: Migrate to dev_pm_opp_set_config()")
introduced a regression as it may undo the clk_names setting in case
the optional regulator is missing. This resulted in test and performance
regressions with lima.

Restore the old behavior where clk_names is set separately so it is not
undone in case of a missing optional regulator.

Fixes: d8c32d3971e4 ("drm/lima: Migrate to dev_pm_opp_set_config()")
Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
---
 drivers/gpu/drm/lima/lima_devfreq.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/lima/lima_devfreq.c b/drivers/gpu/drm/lima/lima_devfreq.c
index 011be7ff51e1..9c8654934fea 100644
--- a/drivers/gpu/drm/lima/lima_devfreq.c
+++ b/drivers/gpu/drm/lima/lima_devfreq.c
@@ -113,10 +113,12 @@ int lima_devfreq_init(struct lima_device *ldev)
 	int ret;
 	const char *regulator_names[] = { "mali", NULL };
 	const char *clk_names[] = { "core", NULL };
-	struct dev_pm_opp_config config = {
-		.regulator_names = regulator_names,
+	struct dev_pm_opp_config config_clk_names = {
 		.clk_names = clk_names,
 	};
+	struct dev_pm_opp_config config_regulator_names = {
+		.regulator_names = regulator_names,
+	};
 
 	if (!device_property_present(dev, "operating-points-v2"))
 		/* Optional, continue without devfreq */
@@ -124,7 +126,15 @@ int lima_devfreq_init(struct lima_device *ldev)
 
 	spin_lock_init(&ldevfreq->lock);
 
-	ret = devm_pm_opp_set_config(dev, &config);
+	/*
+	 * Set clk_names separately so it is not undone in case of
+	 * a missing optional regulator.
+	 */
+	ret = devm_pm_opp_set_config(dev, &config_clk_names);
+	if (ret)
+		return ret;
+
+	ret = devm_pm_opp_set_config(dev, &config_regulator_names);
 	if (ret) {
 		/* Continue if the optional regulator is missing */
 		if (ret != -ENODEV)
-- 
2.37.3

Re: [PATCH] drm/lima: Fix dev_pm_opp_set_config in case of missing regulator

[Viresh Kumar]

On 26-10-22, 10:39, Erico Nunes wrote:
> Commit d8c32d3971e4 ("drm/lima: Migrate to dev_pm_opp_set_config()")
> introduced a regression as it may undo the clk_names setting in case
> the optional regulator is missing. This resulted in test and performance
> regressions with lima.
> 
> Restore the old behavior where clk_names is set separately so it is not
> undone in case of a missing optional regulator.
> 
> Fixes: d8c32d3971e4 ("drm/lima: Migrate to dev_pm_opp_set_config()")
> Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
> ---
>  drivers/gpu/drm/lima/lima_devfreq.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/lima/lima_devfreq.c b/drivers/gpu/drm/lima/lima_devfreq.c
> index 011be7ff51e1..9c8654934fea 100644
> --- a/drivers/gpu/drm/lima/lima_devfreq.c
> +++ b/drivers/gpu/drm/lima/lima_devfreq.c
> @@ -113,10 +113,12 @@ int lima_devfreq_init(struct lima_device *ldev)
>  	int ret;
>  	const char *regulator_names[] = { "mali", NULL };
>  	const char *clk_names[] = { "core", NULL };
> -	struct dev_pm_opp_config config = {
> -		.regulator_names = regulator_names,
> +	struct dev_pm_opp_config config_clk_names = {
>  		.clk_names = clk_names,
>  	};
> +	struct dev_pm_opp_config config_regulator_names = {
> +		.regulator_names = regulator_names,
> +	};
>  
>  	if (!device_property_present(dev, "operating-points-v2"))
>  		/* Optional, continue without devfreq */
> @@ -124,7 +126,15 @@ int lima_devfreq_init(struct lima_device *ldev)
>  
>  	spin_lock_init(&ldevfreq->lock);
>  
> -	ret = devm_pm_opp_set_config(dev, &config);
> +	/*
> +	 * Set clk_names separately so it is not undone in case of
> +	 * a missing optional regulator.
> +	 */
> +	ret = devm_pm_opp_set_config(dev, &config_clk_names);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_pm_opp_set_config(dev, &config_regulator_names);

You can directly call devm_pm_opp_set_clkname() and
devm_pm_opp_set_regulators(), like it was done before my patch, for
single configurations. So basically a simple revert of my commit, with
additional comments you added above.

>  	if (ret) {
>  		/* Continue if the optional regulator is missing */
>  		if (ret != -ENODEV)
> -- 
> 2.37.3

-- 
viresh

Re: [PATCH] drm/lima: Fix dev_pm_opp_set_config in case of missing regulator

[Erico Nunes]

Hello,

On Wed, Oct 26, 2022 at 11:36 AM Viresh Kumar <viresh.kumar@linaro.org> wrote:
> You can directly call devm_pm_opp_set_clkname() and
> devm_pm_opp_set_regulators(), like it was done before my patch, for
> single configurations. So basically a simple revert of my commit, with
> additional comments you added above.

Ok, I'll send a v2 with that.

Thanks

Erico