linux-kernel - Re: [PATCH V2] scsi: ufs: ufs-qcom: add fixup_dev

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Message-ID: <20240828140805.zhvand7q3wbdmfrt@thinkpad>
Date: Wed, 28 Aug 2024 19:38:05 +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>,
	linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, quic_nitirawa@...cinc.com,
	quic_bhaskarv@...cinc.com, quic_narepall@...cinc.com,
	quic_rampraka@...cinc.com, quic_cang@...cinc.com,
	quic_nguyenb@...cinc.com
Subject: Re: [PATCH V2] scsi: ufs: ufs-qcom: add fixup_dev_quirks vops

On Wed, Aug 28, 2024 at 07:10:32PM +0530, Manish Pandey wrote:
> Add fixup_dev_quirk vops in QCOM UFS platforms and provide an initial
> vendor-specific device quirk table to add UFS device specific quirks
> which are enabled only for specified UFS devices.
> 

Why the quirks are enabled only for Qcom platforms? If these are required by the
UFS device, then they should be added to ufs_fixups[] in ufshcd.c.

> Micron and Skhynix UFS device needs DELAY_BEFORE_LPM quirk to have a
> delay before VCC is powered off.
> 

Micron fix is already part of ufs_fixups[].

> Toshiba UFS devices require delay after VCC power rail is turned-off
> in QCOM platforms. Hence add Toshiba vendor ID and DELAY_AFTER_LPM
> quirk for Toshiba UFS devices in QCOM platforms.
> 

This sounds like the issue is specific to Qcom platforms only.

> Signed-off-by: Manish Pandey <quic_mapa@...cinc.com>
> ---

Where is the changelog?

- Mani

>  drivers/ufs/host/ufs-qcom.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 810e637047d0..9dbfbe643e5e 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -834,6 +834,25 @@ static int ufs_qcom_apply_dev_quirks(struct ufs_hba *hba)
>  	return err;
>  }
>  
> +/* UFS device-specific quirks */
> +static struct ufs_dev_quirk ufs_qcom_dev_fixups[] = {
> +	{ .wmanufacturerid = UFS_VENDOR_MICRON,
> +	  .model = UFS_ANY_MODEL,
> +	  .quirk = UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM },
> +	{ .wmanufacturerid = UFS_VENDOR_SKHYNIX,
> +	  .model = UFS_ANY_MODEL,
> +	  .quirk = UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM },
> +	{ .wmanufacturerid = UFS_VENDOR_TOSHIBA,
> +	  .model = UFS_ANY_MODEL,
> +	  .quirk = UFS_DEVICE_QUIRK_DELAY_AFTER_LPM },
> +	{}
> +};
> +
> +static void ufs_qcom_fixup_dev_quirks(struct ufs_hba *hba)
> +{
> +	ufshcd_fixup_dev_quirks(hba, ufs_qcom_dev_fixups);
> +}
> +
>  static u32 ufs_qcom_get_ufs_hci_version(struct ufs_hba *hba)
>  {
>  	return ufshci_version(2, 0);
> @@ -1798,6 +1817,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
>  	.link_startup_notify    = ufs_qcom_link_startup_notify,
>  	.pwr_change_notify	= ufs_qcom_pwr_change_notify,
>  	.apply_dev_quirks	= ufs_qcom_apply_dev_quirks,
> +	.fixup_dev_quirks       = ufs_qcom_fixup_dev_quirks,
>  	.suspend		= ufs_qcom_suspend,
>  	.resume			= ufs_qcom_resume,
>  	.dbg_register_dump	= ufs_qcom_dump_dbg_regs,
> -- 
> 2.17.1
> 

-- 
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