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Nguyen" Cc: , , , , , , , , Matthias Brugger , AngeloGioacchino Del Regno , "open list:ARM/Mediatek SoC support:Keyword:mediatek" , "moderated list:ARM/Mediatek SoC support:Keyword:mediatek" , "moderated list:ARM/Mediatek SoC support:Keyword:mediatek" Subject: Re: [PATCH v3 0/2] *** Remove UFS_DEVICE_QUIRK_DELAY_AFTER_LPM quirk *** From: "Martin K. Petersen" In-Reply-To: (Bao D. 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X-CRM114-Status: GOOD ( 15.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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