From: Bart Van Assche <bvanassche@acm.org>
To: "Bao D. Nguyen" <quic_nguyenb@quicinc.com>,
quic_cang@quicinc.com, quic_nitirawa@quicinc.com,
avri.altman@wdc.com, peter.wang@mediatek.com,
adrian.hunter@intel.com, martin.petersen@oracle.com
Cc: 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 v2 0/2] *** Remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk ***
Date: Mon, 13 Oct 2025 09:25:12 -0700 [thread overview]
Message-ID: <6a2068cc-1d4b-4a80-8a71-e491643a6c57@acm.org> (raw)
In-Reply-To: <cover.1760039554.git.quic_nguyenb@quicinc.com>
On 10/9/25 1:10 PM, Bao D. Nguyen wrote:
> 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 5ms setting and allow the platform drivers
> to override this setting as needed to improve the system resume latency.
For both patches:
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
prev parent reply other threads:[~2025-10-13 16:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-09 20:10 Bao D. Nguyen
2025-10-09 20:10 ` [PATCH v2 1/2] scsi: ufs: core: Remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk Bao D. Nguyen
2025-10-13 3:56 ` Peter Wang (王信友)
2025-10-09 20:10 ` [PATCH v2 2/2] scsi: ufs: core: Replace hard coded vcc-off delay with a variable Bao D. Nguyen
2025-10-13 3:58 ` Peter Wang (王信友)
2025-10-13 19:34 ` Bao D. Nguyen
2025-10-13 16:25 ` Bart Van Assche [this message]
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