linux-kernel - Re: [PATCH 21/31] soc/tegra: Remove the call to devm_pm_opp_set

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Date:   Thu, 23 Jun 2022 22:15:21 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Dmitry Osipenko <digetx@...il.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 21/31] soc/tegra: Remove the call to
 devm_pm_opp_set_clkname()

Hi Viresh,

On 26/05/2022 12:42, Viresh Kumar wrote:
> The OPP core already performs devm_pm_opp_set_clkname() with name as
> NULL, the callers shouldn't be doing the same unless they have a
> different clock name to add here.
> 
> Drop the call.
> 
> Cc: Dmitry Osipenko <digetx@...il.com>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>   drivers/soc/tegra/common.c | 6 ------
>   1 file changed, 6 deletions(-)
> 
> diff --git a/drivers/soc/tegra/common.c b/drivers/soc/tegra/common.c
> index 32c346b72635..49a5360f4507 100644
> --- a/drivers/soc/tegra/common.c
> +++ b/drivers/soc/tegra/common.c
> @@ -108,12 +108,6 @@ int devm_tegra_core_dev_init_opp_table(struct device *dev,
>   	u32 hw_version;
>   	int err;
>   
> -	err = devm_pm_opp_set_clkname(dev, NULL);
> -	if (err) {
> -		dev_err(dev, "failed to set OPP clk: %d\n", err);
> -		return err;
> -	}
> -
>   	/* Tegra114+ doesn't support OPP yet */
>   	if (!of_machine_is_compatible("nvidia,tegra20") &&
>   	    !of_machine_is_compatible("nvidia,tegra30"))


This appears to be breaking a few Tegra drivers. For example, on Tegra210
Jetson TX1 I am seeing the following and the eMMC is no longer working ...

[    0.526729] sdhci-tegra 700b0600.mmc: dev_pm_opp_set_rate: device's opp table doesn't exist
[    0.526733] sdhci-tegra 700b0600.mmc: failed to set clk rate to 400000Hz: -19
[    0.528830] sdhci-tegra 700b0600.mmc: dev_pm_opp_set_rate: device's opp table doesn't exist
[    0.528833] sdhci-tegra 700b0600.mmc: failed to set clk rate to 400000Hz: -19

I have seen another instance of this on Jetson Xavier NX ...

[   12.301336] tegra-pwm 32d0000.pwm: dev_pm_opp_set_rate: device's opp table doesn't exist
[   12.301350] tegra-pwm 32d0000.pwm: Failed to set max frequency: -19

Bisect is point to this commit and so something is not working as
expected.

Cheers
Jon

-- 
nvpublic