linux-kernel - Re: [PATCH 2/2] interconnect: qcom: rpm: drop bogus pm domain attach

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Date:   Mon, 13 Mar 2023 10:10:00 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Georgi Djakov <djakov@...nel.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Yassine Oudjana <y.oudjana@...tonmail.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] interconnect: qcom: rpm: drop bogus pm domain attach



On 13.03.2023 09:49, Johan Hovold wrote:
> Any power domain would already have been attached by the platform bus
> code so drop the bogus power domain attach which always succeeds from
> probe.
> 
> This effectively reverts commit 7de109c0abe9 ("interconnect: icc-rpm:
> Add support for bus power domain").
> 
> Fixes: 7de109c0abe9 ("interconnect: icc-rpm: Add support for bus power domain")
> Cc: Yassine Oudjana <y.oudjana@...tonmail.com>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
Running Friday's -next (so, without your cleanups):

cat /sys/kernel/debug/pm_genpd/aggre0_noc/current_state
> on

Removing the pd attach:

cat /sys/kernel/debug/pm_genpd/aggre0_noc/current_state
> on

Also removing the other consumer of this genpd, the simple-pm-bus
hosting PCIe:

cat /sys/kernel/debug/pm_genpd/aggre0_noc/current_state
> on

So it looks like that's the case!

Tested-by: Konrad Dybcio <konrad.dybcio@...aro.org> # MSM8996 Sony Kagura
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
>  drivers/interconnect/qcom/icc-rpm.c | 6 ------
>  drivers/interconnect/qcom/icc-rpm.h | 1 -
>  drivers/interconnect/qcom/msm8996.c | 1 -
>  3 files changed, 8 deletions(-)
> 
> diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
> index 3b055cd893ea..c303ce22a7cd 100644
> --- a/drivers/interconnect/qcom/icc-rpm.c
> +++ b/drivers/interconnect/qcom/icc-rpm.c
> @@ -496,12 +496,6 @@ int qnoc_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	if (desc->has_bus_pd) {
> -		ret = dev_pm_domain_attach(dev, true);
> -		if (ret)
> -			goto err_disable_clks;
> -	}
> -
>  	provider = &qp->provider;
>  	provider->dev = dev;
>  	provider->set = qcom_icc_set;
> diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
> index a49af844ab13..02257b0d3d5c 100644
> --- a/drivers/interconnect/qcom/icc-rpm.h
> +++ b/drivers/interconnect/qcom/icc-rpm.h
> @@ -91,7 +91,6 @@ struct qcom_icc_desc {
>  	size_t num_nodes;
>  	const char * const *clocks;
>  	size_t num_clocks;
> -	bool has_bus_pd;
>  	enum qcom_icc_type type;
>  	const struct regmap_config *regmap_cfg;
>  	unsigned int qos_offset;
> diff --git a/drivers/interconnect/qcom/msm8996.c b/drivers/interconnect/qcom/msm8996.c
> index 25a1a32bc611..14efd2761b7a 100644
> --- a/drivers/interconnect/qcom/msm8996.c
> +++ b/drivers/interconnect/qcom/msm8996.c
> @@ -1823,7 +1823,6 @@ static const struct qcom_icc_desc msm8996_a0noc = {
>  	.num_nodes = ARRAY_SIZE(a0noc_nodes),
>  	.clocks = bus_a0noc_clocks,
>  	.num_clocks = ARRAY_SIZE(bus_a0noc_clocks),
> -	.has_bus_pd = true,
>  	.regmap_cfg = &msm8996_a0noc_regmap_config
>  };
>