linux/include/ufs, branch v6.15

scsi: ufs: Introduce quirk to extend PA_HIBERN8TIME for UFS devices

2025-04-12T02:13:00Z

Samsung UFS devices require additional time in hibern8 mode before exiting, beyond the negotiated handshaking phase between the host and device. Introduce a quirk to increase the PA_HIBERN8TIME parameter by 100 µs, a value derived from experiments, to ensure a proper hibernation process. Signed-off-by: Manish Pandey Link: https://lore.kernel.org/r/20250411121630.21330-3-quic_mapa@quicinc.com Reviewed-by: Bean Huo Reviewed-by: Manivannan Sadhasivam Signed-off-by: Martin K. Petersen

scsi: ufs: core: Add device level exception support

2025-04-03T14:54:31Z

The ufs device JEDEC specification version 4.1 adds support for the device level exception events. To support this new device level exception feature, expose two new sysfs nodes below to provide the user space access to the device level exception information. /sys/bus/platform/drivers/ufshcd/*/device_lvl_exception_count /sys/bus/platform/drivers/ufshcd/*/device_lvl_exception_id The device_lvl_exception_count sysfs node reports the number of device level exceptions that have occurred since the last time this variable is reset. Writing a value of 0 will reset it. The device_lvl_exception_id reports the exception ID which is the qDeviceLevelExceptionID attribute of the device JEDEC specifications version 4.1 and later. The user space application can query these sysfs nodes to get more information about the device level exception. Signed-off-by: Bao D. Nguyen Link: https://lore.kernel.org/r/6278d7c125b2f0cf5056f4a647a4b9c1fdd24fc7.1743198325.git.quic_nguyenb@quicinc.com Reviewed-by: Peter Wang Reviewed-by: Bart Van Assche Reviewed-by: Arthur Simchaev Signed-off-by: Martin K. Petersen

scsi: ufs: core: Fix a race condition related to device commands

2025-03-21T00:48:37Z

There is a TOCTOU race in ufshcd_compl_one_cqe(): hba->dev_cmd.complete may be cleared from another thread after it has been checked and before it is used. Fix this race by moving the device command completion from the stack of the device command submitter into struct ufs_hba. This patch fixes the following kernel crash: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 Call trace: _raw_spin_lock_irqsave+0x34/0x80 complete+0x24/0xb8 ufshcd_compl_one_cqe+0x13c/0x4f0 ufshcd_mcq_poll_cqe_lock+0xb4/0x108 ufshcd_intr+0x2f4/0x444 __handle_irq_event_percpu+0xbc/0x250 handle_irq_event+0x48/0xb0 Fixes: 5a0b0cb9bee7 ("[SCSI] ufs: Add support for sending NOP OUT UPIU") Signed-off-by: Bart Van Assche Link: https://lore.kernel.org/r/20250314225206.1487838-1-bvanassche@acm.org Reviewed-by: Peter Wang Signed-off-by: Martin K. Petersen

Merge patch series "Initial support for RK3576 UFS controller"

2025-02-25T00:24:14Z

Shawn Lin says: This patchset adds initial UFS controller supprt for RK3576 SoC. Patch 1 is the dt-bindings. Patch 2-4 deal with rpm and spm support in advanced suggested by Ulf. Patch 5 exports two new APIs for host driver. Patch 6 and 7 are the host driver and dtsi support. Link: https://lore.kernel.org/r/1738736156-119203-1-git-send-email-shawn.lin@rock-chips.com Signed-off-by: Martin K. Petersen

scsi: ufs: core: Export ufshcd_dme_reset() and ufshcd_dme_enable()

2025-02-25T00:18:44Z

These two APIs will be used by glue driver if they need a different HCE process. Reviewed-by: Manivannan Sadhasivam Signed-off-by: Shawn Lin Link: https://lore.kernel.org/r/1738736156-119203-6-git-send-email-shawn.lin@rock-chips.com Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen

Merge patch series "Support Multi-frequency scale for UFS"

2025-02-21T03:11:11Z

Ziqi Chen says: With OPP V2 enabled, devfreq can scale clocks amongst multiple frequency plans. However, the gear speed is only toggled between min and max during clock scaling. Enable multi-level gear scaling by mapping clock frequencies to gear speeds, so that when devfreq scales clock frequencies we can put the UFS link at the appropraite gear speeds accordingly. This series has been tested on below platforms - sm8550 mtp + UFS3.1 SM8650 MTP + UFS3.1 SM8750 MTP + UFS4.0 Tested-by: Neil Armstrong # on SM8550-QRD Tested-by: Neil Armstrong # on SM8550-HDK Tested-by: Neil Armstrong # on SM8650-HDK Link: https://lore.kernel.org/r/20250213080008.2984807-1-quic_ziqichen@quicinc.com Signed-off-by: Martin K. Petersen

scsi: ufs: core: Toggle Write Booster during clock scaling base on gear speed

2025-02-21T03:04:54Z

During clock scaling, Write Booster is toggled on or off based on whether the clock is scaled up or down. However, with OPP V2 powered multi-level gear scaling, the gear can be scaled amongst multiple gear speeds, e.g., it may scale down from G5 to G4, or from G4 to G2. To provide flexibilities, add a new field for clock scaling such that during clock scaling Write Booster can be enabled or disabled based on gear speeds but not based on scaling up or down. Signed-off-by: Can Guo Co-developed-by: Ziqi Chen Signed-off-by: Ziqi Chen Link: https://lore.kernel.org/r/20250213080008.2984807-8-quic_ziqichen@quicinc.com Reviewed-by: Bean Huo Tested-by: Neil Armstrong Reviewed-by: Peter Wang Signed-off-by: Martin K. Petersen

scsi: ufs: core: Add a vop to map clock frequency to gear speed

2025-02-21T02:53:49Z

Add a vop to map UFS host controller clock frequencies to the corresponding maximum supported UFS high speed gear speeds. During clock scaling, we can map the target clock frequency, demanded by devfreq, to the maximum supported gear speed, so that devfreq can scale the gear to the highest gear speed supported at the target clock frequency, instead of just scaling up/down the gear between the min and max gear speeds. Co-developed-by: Ziqi Chen Signed-off-by: Ziqi Chen Signed-off-by: Can Guo Link: https://lore.kernel.org/r/20250213080008.2984807-4-quic_ziqichen@quicinc.com Reviewed-by: Bean Huo Reviewed-by: Bart Van Assche Tested-by: Neil Armstrong Reviewed-by: Peter Wang Signed-off-by: Martin K. Petersen

scsi: ufs: core: Pass target_freq to clk_scale_notify() vop

2025-02-21T02:53:49Z

Instead of only two frequencies, if OPP V2 is used, the UFS devfreq clock scaling may scale the clock among multiple frequencies, so just passing up/down to vop clk_scale_notify() is not enough to cover the intermediate clock freqs between the min and max freqs. Hence pass the target_freq, which will be used in successive commits, to clk_scale_notify() to allow the vop to perform corresponding configurations with regard to the clock freqs. Signed-off-by: Can Guo Co-developed-by: Ziqi Chen Signed-off-by: Ziqi Chen Link: https://lore.kernel.org/r/20250213080008.2984807-2-quic_ziqichen@quicinc.com Reviewed-by: Bean Huo Reviewed-by: Bart Van Assche Tested-by: Neil Armstrong Reviewed-by: Peter Wang Signed-off-by: Martin K. Petersen

scsi: ufs: Constify the third pwr_change_notify() argument

2025-02-13T03:25:06Z

The third pwr_change_notify() argument is an input parameter. Make this explicit by declaring it 'const'. Signed-off-by: Bart Van Assche Link: https://lore.kernel.org/r/20250212213838.1044917-1-bvanassche@acm.org Signed-off-by: Martin K. Petersen