linux-kernel - Re: [PATCH V2 2/2] scsi: ufs: introduce quirk to extend PA

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Message-ID: <hcguawgzuqgi2cyw3nf7uiilahjsvrm37f6zgfqlnfkck3jatv@xgaca3zgts2u>
Date: Mon, 7 Apr 2025 00:05:19 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Manish Pandey <quic_mapa@...cinc.com>
Cc: "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>, 
	"Martin K. Petersen" <martin.petersen@...cle.com>, Alim Akhtar <alim.akhtar@...sung.com>, 
	Avri Altman <avri.altman@....com>, Bart Van Assche <bvanassche@....org>, linux-scsi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, quic_nitirawa@...cinc.com, 
	quic_bhaskarv@...cinc.com, quic_rampraka@...cinc.com, quic_cang@...cinc.com, 
	quic_nguyenb@...cinc.com
Subject: Re: [PATCH V2 2/2] scsi: ufs: introduce quirk to extend
 PA_HIBERN8TIME for UFS devices

On Fri, Apr 04, 2025 at 11:15:39PM +0530, Manish Pandey wrote:
> Some UFS devices need additional time in hibern8 mode before exiting,
> beyond the negotiated handshaking phase between the host and device.
> Introduce a quirk to increase the PA_HIBERN8TIME parameter by 100 µs
> to ensure proper hibernation process.
> 

This commit message didn't mention the UFS device for which this quirk is being
applied.

> Signed-off-by: Manish Pandey <quic_mapa@...cinc.com>
> ---
>  drivers/ufs/core/ufshcd.c | 31 +++++++++++++++++++++++++++++++
>  include/ufs/ufs_quirks.h  |  6 ++++++
>  2 files changed, 37 insertions(+)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 464f13da259a..2b8203fe7b8c 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -278,6 +278,7 @@ static const struct ufs_dev_quirk ufs_fixups[] = {
>  	  .model = UFS_ANY_MODEL,
>  	  .quirk = UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
>  		   UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE |
> +		   UFS_DEVICE_QUIRK_PA_HIBER8TIME |
>  		   UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS },
>  	{ .wmanufacturerid = UFS_VENDOR_SKHYNIX,
>  	  .model = UFS_ANY_MODEL,
> @@ -8384,6 +8385,33 @@ static int ufshcd_quirk_tune_host_pa_tactivate(struct ufs_hba *hba)
>  	return ret;
>  }
>  
> +/**
> + * ufshcd_quirk_override_pa_h8time - Ensures proper adjustment of PA_HIBERN8TIME.
> + * @hba: per-adapter instance
> + *
> + * Some UFS devices require specific adjustments to the PA_HIBERN8TIME parameter
> + * to ensure proper hibernation timing. This function retrieves the current
> + * PA_HIBERN8TIME value and increments it by 100us.
> + */
> +static void ufshcd_quirk_override_pa_h8time(struct ufs_hba *hba)
> +{
> +	u32 pa_h8time = 0;

Why do you need to initialize it?

> +	int ret;
> +
> +	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_HIBERN8TIME),
> +			&pa_h8time);
> +	if (ret) {
> +		dev_err(hba->dev, "Failed to get PA_HIBERN8TIME: %d\n", ret);
> +		return;
> +	}
> +
> +	/* Increment by 1 to increase hibernation time by 100 µs */

>From where the value of 100us adjustment is coming from?

- Mani

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