[PATCH 5.15.y 1/2] scsi: ufs: ufs-pci: Fix hibernate state transition for Intel MTL-like host controllers
From: Archana Patni archana.patni@intel.com
commit 4428ddea832cfdb63e476eb2e5c8feb5d36057fe upstream.
UFSHCD core disables the UIC completion interrupt when issuing UIC hibernation commands, and re-enables it afterwards if it was enabled to start with, refer ufshcd_uic_pwr_ctrl(). For Intel MTL-like host controllers, accessing the register to re-enable the interrupt disrupts the state transition.
Use hibern8_notify variant operation to disable the interrupt during the entire hibernation, thereby preventing the disruption.
Fixes: 4049f7acef3e ("scsi: ufs: ufs-pci: Add support for Intel MTL") Cc: stable@vger.kernel.org Signed-off-by: Archana Patni archana.patni@intel.com Link: https://lore.kernel.org/r/20250723165856.145750-2-adrian.hunter@intel.com Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Adrian Hunter adrian.hunter@intel.com --- drivers/scsi/ufs/ufshcd-pci.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c index 0920530a72d2..11071c132c1d 100644 --- a/drivers/scsi/ufs/ufshcd-pci.c +++ b/drivers/scsi/ufs/ufshcd-pci.c @@ -203,6 +203,32 @@ static int ufs_intel_lkf_apply_dev_quirks(struct ufs_hba *hba) return ret; }
+static void ufs_intel_ctrl_uic_compl(struct ufs_hba *hba, bool enable) +{ + u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE); + + if (enable) + set |= UIC_COMMAND_COMPL; + else + set &= ~UIC_COMMAND_COMPL; + ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE); +} + +static void ufs_intel_mtl_h8_notify(struct ufs_hba *hba, + enum uic_cmd_dme cmd, + enum ufs_notify_change_status status) +{ + /* + * Disable UIC COMPL INTR to prevent access to UFSHCI after + * checking HCS.UPMCRS + */ + if (status == PRE_CHANGE && cmd == UIC_CMD_DME_HIBER_ENTER) + ufs_intel_ctrl_uic_compl(hba, false); + + if (status == POST_CHANGE && cmd == UIC_CMD_DME_HIBER_EXIT) + ufs_intel_ctrl_uic_compl(hba, true); +} + #define INTEL_ACTIVELTR 0x804 #define INTEL_IDLELTR 0x808
@@ -476,6 +502,7 @@ static struct ufs_hba_variant_ops ufs_intel_mtl_hba_vops = { .init = ufs_intel_mtl_init, .exit = ufs_intel_common_exit, .hce_enable_notify = ufs_intel_hce_enable_notify, + .hibern8_notify = ufs_intel_mtl_h8_notify, .link_startup_notify = ufs_intel_link_startup_notify, .resume = ufs_intel_resume, .device_reset = ufs_intel_device_reset,
commit 6de7435e6b81fe52c0ab4c7e181f6b5decd18eb1 upstream.
Intel MTL-like host controllers support auto-hibernate. Using auto-hibernate with manual (driver initiated) hibernate produces more complex operation. For example, the host controller will have to exit auto-hibernate simply to allow the driver to enter hibernate state manually. That is not recommended.
The default rpm_lvl and spm_lvl is 3, which includes manual hibernate.
Change the default values to 2, which does not.
Note, to be simpler to backport to stable kernels, utilize the UFS PCI driver's ->late_init() call back. Recent commits have made it possible to set up a controller-specific default in the regular ->init() call back, but not all stable kernels have those changes.
Fixes: 4049f7acef3e ("scsi: ufs: ufs-pci: Add support for Intel MTL") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20250723165856.145750-3-adrian.hunter@intel.com Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Adrian Hunter adrian.hunter@intel.com --- drivers/scsi/ufs/ufshcd-pci.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c index 11071c132c1d..ec483ece09b6 100644 --- a/drivers/scsi/ufs/ufshcd-pci.c +++ b/drivers/scsi/ufs/ufshcd-pci.c @@ -454,10 +454,23 @@ static int ufs_intel_adl_init(struct ufs_hba *hba) return ufs_intel_common_init(hba); }
+static void ufs_intel_mtl_late_init(struct ufs_hba *hba) +{ + hba->rpm_lvl = UFS_PM_LVL_2; + hba->spm_lvl = UFS_PM_LVL_2; +} + static int ufs_intel_mtl_init(struct ufs_hba *hba) { + struct ufs_host *ufs_host; + int err; + hba->caps |= UFSHCD_CAP_CRYPTO | UFSHCD_CAP_WB_EN; - return ufs_intel_common_init(hba); + err = ufs_intel_common_init(hba); + /* Get variant after it is set in ufs_intel_common_init() */ + ufs_host = ufshcd_get_variant(hba); + ufs_host->late_init = ufs_intel_mtl_late_init; + return err; }
static struct ufs_hba_variant_ops ufs_intel_cnl_hba_vops = {
linux-stable-mirror@lists.linaro.org
-
Adrian Hunter