linux-kernel - Re: [PATCH] bus: mhi: core: Improve debug messages for power on

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Date:   Fri, 30 Apr 2021 17:30:37 -0700
From:   Hemant Kumar <hemantk@...eaurora.org>
To:     Bhaumik Bhatt <bbhatt@...eaurora.org>,
        manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, jhugo@...eaurora.org,
        linux-kernel@...r.kernel.org, loic.poulain@...aro.org
Subject: Re: [PATCH] bus: mhi: core: Improve debug messages for power on


Hi Bhaumik,

On 4/26/21 6:00 PM, Bhaumik Bhatt wrote:
> Improve error message to be more descriptive if a failure occurs
> with an invalid power on execution environment. Also add a debug
> message to print the execution environment and MHI state before
> a power on is attempted to get a better view of device states.
Can we add a scenario where this dbg log can help ? That gives a good 
justification for addition of new log.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> ---
>   drivers/bus/mhi/core/pm.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index adf426c..f4a8b9a 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -1076,12 +1076,16 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
>   
>   	/* Confirm that the device is in valid exec env */
>   	if (!MHI_IN_PBL(current_ee) && current_ee != MHI_EE_AMSS) {
> -		dev_err(dev, "Not a valid EE for power on\n");
> +		dev_err(dev, "%s is not a valid EE for power on\n",
> +			TO_MHI_EXEC_STR(current_ee));
>   		ret = -EIO;
>   		goto error_async_power_up;
>   	}
>   
>   	state = mhi_get_mhi_state(mhi_cntrl);
> +	dev_dbg(dev, "Attempting power on with EE: %s, state: %s\n",
> +		TO_MHI_EXEC_STR(current_ee), TO_MHI_STATE_STR(state));
> +
>   	if (state == MHI_STATE_SYS_ERR) {
>   		mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET);
>   		ret = wait_event_timeout(mhi_cntrl->state_event,
> 

Thanks,
Hemant
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