linux-kernel - Re: [PATCH v2] bus: mhi: core: Improve debug messages for power up

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Message-ID: <20210521131457.GG70095@thinkpad>
Date:   Fri, 21 May 2021 18:44:57 +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,
        loic.poulain@...aro.org
Subject: Re: [PATCH v2] bus: mhi: core: Improve debug messages for power up

On Mon, May 03, 2021 at 01:00:38PM -0700, Bhaumik Bhatt wrote:
> Improve error message to be more descriptive if a failure occurs
> with an invalid power up execution environment. Additionally, add
> a debug log to print the execution environment and MHI state
> before a power up is attempted to confirm if the device is in an
> expected state. This helps clarify reasons for power up failures
> such as the device being found in a PBL or Emergency Download
> Mode execution environment and the host expected a full power up
> with Pass-Through and no image loading involved.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> ---

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> v2: Use power up instead of power on and update commit text with an example.
> 
>  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,
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>