From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: "Bao D. Nguyen" <quic_nguyenb@quicinc.com>
Cc: <quic_cang@quicinc.com>, <quic_nitirawa@quicinc.com>,
<bvanassche@acm.org>, <avri.altman@wdc.com>,
<peter.wang@mediatek.com>, <adrian.hunter@intel.com>,
<martin.petersen@oracle.com>, <linux-scsi@vger.kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
"open list:ARM/Mediatek SoC support:Keyword:mediatek"
<linux-kernel@vger.kernel.org>,
"moderated list:ARM/Mediatek SoC support:Keyword:mediatek"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support:Keyword:mediatek"
<linux-mediatek@lists.infradead.org>
Subject: Re: [PATCH v3 0/2] *** Remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk ***
Date: Tue, 21 Oct 2025 21:25:09 -0400 [thread overview]
Message-ID: <yq14irr6848.fsf@ca-mkp.ca.oracle.com> (raw)
In-Reply-To: <cover.1760383740.git.quic_nguyenb@quicinc.com> (Bao D. Nguyen's message of "Mon, 13 Oct 2025 12:38:14 -0700")
Bao,
> Multiple ufs device manufacturers request support for the
> UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk in the Qualcomm's platform
> driver. After checking further with the major UFS manufacturers
> engineering teams such as Samsung, Kioxia, SK Hynix and Micron, all
> the manufacturers require this quirk. Since the quirk is needed by all
> the ufs device manufacturers, remove the quirk in the ufs core driver
> and implement a universal delay for all the ufs devices.
>
> In addition to verifying with the public device's datasheets, the ufs
> device manufacturer's engineering teams confirmed the required vcc
> power-off time for the devices is a minimum of 1ms before vcc can be
> powered on again. The existing 5ms delay implemented in the ufs core
> driver seems too conservative, so replace the hard coded 5ms delay
> with a variable default to 2ms setting to improve the system resume
> latency. The platform drivers can override this setting as needed.
Applied to 6.19/scsi-staging, thanks!
--
Martin K. Petersen
prev parent reply other threads:[~2025-10-22 1:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-13 19:38 [PATCH v3 0/2] *** Remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk *** Bao D. Nguyen
2025-10-13 19:38 ` [PATCH v3 1/2] scsi: ufs: core: Remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk Bao D. Nguyen
2025-10-22 1:25 ` Martin K. Petersen [this message]
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