linux-kernel - Re: [PATCH] [PATCH] venus: core: remove CNOC voting while device suspend

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Message-ID: <e5b94b17-5864-e02d-435d-beceeceed375@linaro.org>
Date:   Tue, 7 Apr 2020 11:15:28 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Mansur Alisha Shaik <mansur@...eaurora.org>,
        linux-media@...r.kernel.org, stanimir.varbanov@...aro.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        vgarodia@...eaurora.org
Subject: Re: [PATCH] [PATCH] venus: core: remove CNOC voting while device
 suspend

Hi Mansur,

The patch looks fine and correct but the description should be better.

On 2/17/20 2:01 PM, Mansur Alisha Shaik wrote:
> video driver is voting for CNOC during probe and not clear
> while device suspend. Because of which XO shutdown is
> happing(BCM42: VALID: 0x1 VOTE_X: 0x0000 VOTE_Y: 0x0004).
> 
> So, clearing CNOC voting while device suspend.

Maybe something like this ?

The Venus driver is voting Configuration NoC during .probe but not clear
voting in .suspend. As a consequence the whole device could leak energy
while in suspend. Correct this by moving voting in .resume and unvoting
in .suspend.

> 
> Signed-off-by: Mansur Alisha Shaik <mansur@...eaurora.org>
> ---
>  drivers/media/platform/qcom/venus/core.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index e7995cb..153effe 100644
> --- a/drivers/media/platform/qcom/venus/core.c
> +++ b/drivers/media/platform/qcom/venus/core.c
> @@ -244,10 +244,6 @@ static int venus_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	ret = icc_set_bw(core->cpucfg_path, 0, kbps_to_icc(1000));
> -	if (ret)
> -		return ret;
> -
>  	ret = hfi_create(core, &venus_core_ops);
>  	if (ret)
>  		return ret;
> @@ -353,6 +349,10 @@ static __maybe_unused int venus_runtime_suspend(struct device *dev)
>  	if (ret)
>  		return ret;
>  
> +	ret = icc_set_bw(core->cpucfg_path, 0, 0);
> +	if (ret)
> +		return ret;
> +
>  	if (pm_ops->core_power)
>  		ret = pm_ops->core_power(dev, POWER_OFF);
>  
> @@ -371,6 +371,10 @@ static __maybe_unused int venus_runtime_resume(struct device *dev)
>  			return ret;
>  	}
>  
> +	ret = icc_set_bw(core->cpucfg_path, 0, kbps_to_icc(1000));
> +	if (ret)
> +		return ret;
> +
>  	return hfi_core_resume(core, false);
>  }
>  
> 

-- 
regards,
Stan

-- 
regards,
Stan