linux-kernel - Re: [PATCH v7 2/8] bus: mhi: core: Cache intmod from mhi event to mhi channel

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Date:   Sat, 9 May 2020 11:17:27 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Bhaumik Bhatt <bbhatt@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        hemantk@...eaurora.org, jhugo@...eaurora.org
Subject: Re: [PATCH v7 2/8] bus: mhi: core: Cache intmod from mhi event to
 mhi channel

On Fri, May 08, 2020 at 07:26:42PM -0700, Bhaumik Bhatt wrote:
> From: Hemant Kumar <hemantk@...eaurora.org>
> 
> Driver is using zero initialized intmod value from mhi channel when
> configuring TRE for bei field. This prevents interrupt moderation to
> take effect in case it is supported by an event ring. Fix this by
> copying intmod value from associated event ring to mhi channel upon
> registering mhi controller.
> 
> Signed-off-by: Hemant Kumar <hemantk@...eaurora.org>
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> Reviewed-by: Jeffrey Hugo <jhugo@...eaurora.org>

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

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/init.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index eb2ab05..1a93d24 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -863,6 +863,10 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
>  		mutex_init(&mhi_chan->mutex);
>  		init_completion(&mhi_chan->completion);
>  		rwlock_init(&mhi_chan->lock);
> +
> +		/* used in setting bei field of TRE */
> +		mhi_event = &mhi_cntrl->mhi_event[mhi_chan->er_index];
> +		mhi_chan->intmod = mhi_event->intmod;
>  	}
>  
>  	if (mhi_cntrl->bounce_buf) {
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project