linux-kernel - Re: [PATCH v4 04/12] bus: mhi: core: Move to SYS

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Date:   Mon, 16 Nov 2020 11:42:48 +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 v4 04/12] bus: mhi: core: Move to SYS_ERROR regardless of
 RDDM capability

On Mon, Nov 09, 2020 at 12:47:23PM -0800, Bhaumik Bhatt wrote:
> In some cases, the entry of device to RDDM execution environment
> can occur after a significant amount of time has elapsed and a
> SYS_ERROR state change event has already arrived. This can result
> in scenarios where MHI controller and client drivers are unaware
> of the error state of the device. Remove the check for rddm_image
> when processing the SYS_ERROR state change as it is present in
> mhi_pm_sys_err_handler() already and prevent further activity
> until the expected RDDM execution environment change occurs or
> the controller driver decides further action.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>

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

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/main.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
> index f953e2a..91f8b8d 100644
> --- a/drivers/bus/mhi/core/main.c
> +++ b/drivers/bus/mhi/core/main.c
> @@ -737,11 +737,6 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
>  			{
>  				enum mhi_pm_state new_state;
>  
> -				/* skip SYS_ERROR handling if RDDM supported */
> -				if (mhi_cntrl->ee == MHI_EE_RDDM ||
> -				    mhi_cntrl->rddm_image)
> -					break;
> -
>  				dev_dbg(dev, "System error detected\n");
>  				write_lock_irq(&mhi_cntrl->pm_lock);
>  				new_state = mhi_tryset_pm_state(mhi_cntrl,
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>