linux-kernel - Re: [PATCH v2 05/17] scsi: ufs: qcom: Remove the warning message when core

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Date:   Fri, 8 Dec 2023 14:55:21 +0530
From:   Nitin Rawat <quic_nitirawa@...cinc.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        <martin.petersen@...cle.com>, <jejb@...ux.ibm.com>
CC:     <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_cang@...cinc.com>,
        <ahalaney@...hat.com>
Subject: Re: [PATCH v2 05/17] scsi: ufs: qcom: Remove the warning message when
 core_reset is not available



On 12/8/2023 12:28 PM, Manivannan Sadhasivam wrote:
> core_reset is optional, so there is no need to warn the user if it is not
> available.
> 
> Reviewed-by: Andrew Halaney <ahalaney@...hat.com>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>   drivers/ufs/host/ufs-qcom.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index dc93b1c5ca74..d474de0739e4 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -296,10 +296,8 @@ static int ufs_qcom_host_reset(struct ufs_hba *hba)
>   	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
>   	bool reenable_intr;
>   
> -	if (!host->core_reset) {
> -		dev_warn(hba->dev, "%s: reset control not set\n", __func__);
> +	if (!host->core_reset)
>   		return 0;
> -	}
>   
>   	reenable_intr = hba->is_irq_enabled;
>   	disable_irq(hba->irq);


Hi Mani,

I think core reset is not frequent. It happen during only probe ,error 
handler.

core reset is needed in kernel to cleanup UFS phy and controller 
configuration before UFS HLOS operation starts as per HPG.

Having existing warn print can be used to to debug or atleast know 
core_reset is missed in device tree to give indication complete reset 
hasn't been done and we could still be operating in bootloader 
configuration.


Regards,
Nitin