linux-kernel - Re: [PATCH v5 08/10] bus: mhi: core: Use counters to track MHI device state transitions

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Message-ID: <20200724052434.GB17957@Mani-XPS-13-9360>
Date:   Fri, 24 Jul 2020 10:54:34 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Bhaumik Bhatt <bbhatt@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        jhugo@...eaurora.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 08/10] bus: mhi: core: Use counters to track MHI
 device state transitions

On Thu, Jul 23, 2020 at 03:36:40PM -0700, Bhaumik Bhatt wrote:
> Use counters to track MHI device state transitions such as those
> to M0, M2, or M3 states. This helps in better debug by allowing
> the user to see the number of transitions to a certain state when
> queried using the states debugfs entry.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>

This patch should come before the debugfs patch. Also the header addition
should be here.

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/pm.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 27bb471..ce4d969 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -256,6 +256,7 @@ int mhi_pm_m0_transition(struct mhi_controller *mhi_cntrl)
>  		dev_err(dev, "Unable to transition to M0 state\n");
>  		return -EIO;
>  	}
> +	mhi_cntrl->M0++;
>  
>  	/* Wake up the device */
>  	read_lock_bh(&mhi_cntrl->pm_lock);
> @@ -326,6 +327,8 @@ void mhi_pm_m1_transition(struct mhi_controller *mhi_cntrl)
>  		mhi_cntrl->dev_state = MHI_STATE_M2;
>  
>  		write_unlock_irq(&mhi_cntrl->pm_lock);
> +
> +		mhi_cntrl->M2++;
>  		wake_up_all(&mhi_cntrl->state_event);
>  
>  		/* If there are any pending resources, exit M2 immediately */
> @@ -362,6 +365,7 @@ int mhi_pm_m3_transition(struct mhi_controller *mhi_cntrl)
>  		return -EIO;
>  	}
>  
> +	mhi_cntrl->M3++;
>  	wake_up_all(&mhi_cntrl->state_event);
>  
>  	return 0;
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>