linux-kernel - [PATCH v1 0/2] *** Remove UFS_DEVICE_QUIRK_DELAY_AFTER

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Message-ID: <cover.1759348507.git.quic_nguyenb@quicinc.com>
Date: Wed, 1 Oct 2025 13:57:10 -0700
From: "Bao D. Nguyen" <quic_nguyenb@...cinc.com>
To: <quic_cang@...cinc.com>, <quic_nitirawa@...cinc.com>, <bvanassche@....org>,
        <avri.altman@....com>, <peter.wang@...iatek.com>,
        <manivannan.sadhasivam@...aro.org>, <adrian.hunter@...el.com>,
        <martin.petersen@...cle.com>
CC: <linux-scsi@...r.kernel.org>, "Bao D. Nguyen" <quic_nguyenb@...cinc.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>,
        "open list:ARM/Mediatek SoC
 support:Keyword:mediatek" <linux-kernel@...r.kernel.org>,
        "moderated
 list:ARM/Mediatek SoC support:Keyword:mediatek"
	<linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC
 support:Keyword:mediatek" <linux-mediatek@...ts.infradead.org>
Subject: [PATCH v1 0/2] *** Remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk ***

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 reduce this time to 2ms to improve
the system resume latency.

Bao D. Nguyen (2):
  scsi: ufs: core: Remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk
  scsi: ufs: core: Reduce the sleep before vcc can be powered on

 drivers/ufs/core/ufshcd.c       |  7 +++----
 drivers/ufs/host/ufs-mediatek.c | 11 ++++-------
 drivers/ufs/host/ufs-qcom.c     |  3 ---
 include/ufs/ufs_quirks.h        |  7 -------
 4 files changed, 7 insertions(+), 21 deletions(-)

-- 
2.7.4