linux-kernel - Re: [PATCH v3 04/13] remoteproc: qcom_q6v5_mss: Handle platforms with one power domain

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Message-ID: <5b0f9cd4-df65-4963-8d6d-5bdf759ba0c5@oss.qualcomm.com>
Date: Tue, 28 Jan 2025 11:45:51 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Luca Weiss <luca@...aweiss.eu>, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Matti Lehtimäki <matti.lehtimaki@...il.com>
Cc: linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/13] remoteproc: qcom_q6v5_mss: Handle platforms with
 one power domain

On 27.01.2025 11:45 PM, Luca Weiss wrote:
> For example MSM8974 has mx voltage rail exposed as regulator and only cx
> voltage rail is exposed as power domain. This power domain (cx) is
> attached internally in power domain and cannot be attached in this driver.
> 
> Fixes: 8750cf392394 ("remoteproc: qcom_q6v5_mss: Allow replacing regulators with power domains")
> Co-developed-by: Matti Lehtimäki <matti.lehtimaki@...il.com>
> Signed-off-by: Matti Lehtimäki <matti.lehtimaki@...il.com>
> Signed-off-by: Luca Weiss <luca@...aweiss.eu>
> ---
>  drivers/remoteproc/qcom_q6v5_mss.c | 20 +++++++++++++++++---
>  1 file changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index e78bd986dc3f256effce4470222c0a5faeea86ec..0e1b0934ceedd13d5790b798afc95d68a8314c75 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -1831,6 +1831,13 @@ static int q6v5_pds_attach(struct device *dev, struct device **devs,
>  	while (pd_names[num_pds])
>  		num_pds++;
>  
> +	/* Handle single power domain */
> +	if (num_pds == 1 && dev->pm_domain) {
> +		devs[0] = dev;
> +		pm_runtime_enable(dev);

This call can fail

Konrad