linux-kernel - Re: [PATCH v1 2/2] scsi: ufs: qcom: Update the UIC Command Timeout

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Date: Wed, 22 May 2024 11:18:31 -0700
From: Bart Van Assche <bvanassche@....org>
To: "Bao D. Nguyen" <quic_nguyenb@...cinc.com>, quic_cang@...cinc.com,
 quic_nitirawa@...cinc.com, avri.altman@....com, beanhuo@...ron.com,
 adrian.hunter@...el.com, martin.petersen@...cle.com
Cc: linux-scsi@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 "James E.J. Bottomley" <jejb@...ux.ibm.com>,
 "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] scsi: ufs: qcom: Update the UIC Command Timeout

On 5/22/24 00:01, Bao D. Nguyen wrote:
> Change the UIC command timeout to 2 seconds.
> This extra time is to allow the uart occasionally print long
> debug messages and logging from different modules during
> product development. With the default hardcoded 500ms timeout,
> the uart printing with interrupt disabled may cause the UIC command
> interrupt get starved, resulting in a UIC command timeout and
> eventually a watchdog timeout.
> When a product development completes, the vendors may
> select a different UIC command timeout as desired.
> 
> Signed-off-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>
> ---
>   drivers/ufs/host/ufs-qcom.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 79f8cb3..4649e0f 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -49,6 +49,7 @@ enum {
>   
>   #define QCOM_UFS_MAX_GEAR 4
>   #define QCOM_UFS_MAX_LANE 2
> +#define QCOM_UIC_CMD_TIMEOUT_MS 2000
>   
>   enum {
>   	MODE_MIN,
> @@ -1111,6 +1112,8 @@ static int ufs_qcom_init(struct ufs_hba *hba)
>   		dev_warn(dev, "%s: failed to configure the testbus %d\n",
>   				__func__, err);
>   
> +	hba->uic_cmd_timeout = QCOM_UIC_CMD_TIMEOUT_MS;
> +
>   	return 0;
>   
>   out_variant_clear:

Given the description of patch 1, the addressed issue is not specific to
a single vendor. Is that correct?

Since the described issue is only encountered during development, why to
modify the UIC command timeout unconditionally?

Thanks,

Bart.