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From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: Bhaumik Bhatt <bbhatt@codeaurora.org>
Cc: linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org,
	jhugo@codeaurora.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 2/9] bus: mhi: core: Abort suspends due to outgoing pending packets
Date: Sat, 4 Jul 2020 20:05:44 +0530	[thread overview]
Message-ID: <20200704143544.GB3066@Mani-XPS-13-9360> (raw)
In-Reply-To: <1593448782-8385-3-git-send-email-bbhatt@codeaurora.org>

On Mon, Jun 29, 2020 at 09:39:35AM -0700, Bhaumik Bhatt wrote:
> Add the missing check to abort suspends if a client has pending outgoing
> packets to send to the device. This allows better utilization of the MHI
> bus wherein clients on the host are not left waiting for longer suspend
> or resume cycles to finish for data transfers.
> 

Just one nitpick: Please always use the terms 'client drivers' referring to the
MHI client drivers in the kernel and 'client devices' referring to the physical
MHI client devices. The term 'client' creates ambiguity.

> Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>

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

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/pm.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 7960980..661d704 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -686,7 +686,8 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl)
>  		return -EIO;
>  
>  	/* Return busy if there are any pending resources */
> -	if (atomic_read(&mhi_cntrl->dev_wake))
> +	if (atomic_read(&mhi_cntrl->dev_wake) ||
> +	    atomic_read(&mhi_cntrl->pending_pkts))
>  		return -EBUSY;
>  
>  	/* Take MHI out of M2 state */
> @@ -712,7 +713,8 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl)
>  
>  	write_lock_irq(&mhi_cntrl->pm_lock);
>  
> -	if (atomic_read(&mhi_cntrl->dev_wake)) {
> +	if (atomic_read(&mhi_cntrl->dev_wake) ||
> +	    atomic_read(&mhi_cntrl->pending_pkts)) {
>  		write_unlock_irq(&mhi_cntrl->pm_lock);
>  		return -EBUSY;
>  	}
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

  reply	other threads:[~2020-07-04 14:35 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29 16:39 [PATCH v4 0/9] Introduce features and debugfs/sysfs entries for MHI Bhaumik Bhatt
2020-06-29 16:39 ` [PATCH v4 1/9] bus: mhi: core: Remove double occurrence for mhi_ctrl_ev_task() declaration Bhaumik Bhatt
2020-07-04 14:32   ` Manivannan Sadhasivam
2020-06-29 16:39 ` [PATCH v4 2/9] bus: mhi: core: Abort suspends due to outgoing pending packets Bhaumik Bhatt
2020-07-04 14:35   ` Manivannan Sadhasivam [this message]
2020-06-29 16:39 ` [PATCH v4 3/9] bus: mhi: core: Use helper API to trigger a non-blocking host resume Bhaumik Bhatt
2020-07-04 14:47   ` Manivannan Sadhasivam
2020-07-08 20:53     ` bbhatt
2020-07-16  6:08       ` Manivannan Sadhasivam
2020-06-29 16:39 ` [PATCH v4 4/9] bus: mhi: core: Trigger a host resume when device vote is requested Bhaumik Bhatt
2020-07-04 14:56   ` Manivannan Sadhasivam
2020-06-29 16:39 ` [PATCH v4 5/9] bus: mhi: core: Use generic name field for an MHI device Bhaumik Bhatt
2020-07-04 15:08   ` Manivannan Sadhasivam
2020-06-29 16:39 ` [PATCH v4 6/9] bus: mhi: core: Introduce helper function to check device state Bhaumik Bhatt
2020-07-04 15:13   ` Manivannan Sadhasivam
2020-06-29 16:39 ` [PATCH v4 7/9] bus: mhi: core: Introduce debugfs entries and counters for MHI Bhaumik Bhatt
2020-07-04 15:41   ` Manivannan Sadhasivam
2020-07-09 19:33     ` bbhatt
2020-07-16  5:01       ` Manivannan Sadhasivam
2020-06-29 16:39 ` [PATCH v4 8/9] bus: mhi: core: Read and save device hardware information from BHI Bhaumik Bhatt
2020-07-04 15:47   ` Manivannan Sadhasivam
2020-06-29 16:39 ` [PATCH v4 9/9] bus: mhi: core: Introduce sysfs entries for MHI Bhaumik Bhatt
2020-07-04 15:54   ` Manivannan Sadhasivam

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