commit 828d63042aeca132a93938b98dc7f1a6c97bbc51 upstream.

Avoid HW bug on some platforms where we enter D0i3 state and CPU is in low power states (C8 or above).

Fixes: 852be13f3bd3 ("accel/ivpu: Add PM support") Signed-off-by: Jacek Lawrynowicz jacek.lawrynowicz@linux.intel.com Reviewed-by: Stanislaw Gruszka stanislaw.gruszka@linux.intel.com Signed-off-by: Stanislaw Gruszka stanislaw.gruszka@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20231003064213.1527327-1-stani... - --- drivers/accel/ivpu/ivpu_drv.c | 11 ++++++++--- drivers/accel/ivpu/ivpu_drv.h | 1 + drivers/accel/ivpu/ivpu_hw.h | 8 ++++++++ drivers/accel/ivpu/ivpu_hw_mtl.c | 1 + drivers/accel/ivpu/ivpu_pm.c | 3 ++- 5 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/accel/ivpu/ivpu_drv.c b/drivers/accel/ivpu/ivpu_drv.c index 8396db2b5203..13e11437bee5 100644 --- a/drivers/accel/ivpu/ivpu_drv.c +++ b/drivers/accel/ivpu/ivpu_drv.c @@ -343,14 +343,19 @@ int ivpu_boot(struct ivpu_device *vdev) return 0; }

-int ivpu_shutdown(struct ivpu_device *vdev) +void ivpu_prepare_for_reset(struct ivpu_device *vdev) { - int ret; - ivpu_hw_irq_disable(vdev); disable_irq(vdev->irq); ivpu_ipc_disable(vdev); ivpu_mmu_disable(vdev); +} + +int ivpu_shutdown(struct ivpu_device *vdev) +{ + int ret; + + ivpu_prepare_for_reset(vdev);

ret = ivpu_hw_power_down(vdev); if (ret) diff --git a/drivers/accel/ivpu/ivpu_drv.h b/drivers/accel/ivpu/ivpu_drv.h index 399dc5dcefd7..343b15e56799 100644 --- a/drivers/accel/ivpu/ivpu_drv.h +++ b/drivers/accel/ivpu/ivpu_drv.h @@ -144,6 +144,7 @@ void ivpu_file_priv_put(struct ivpu_file_priv **link);

int ivpu_boot(struct ivpu_device *vdev); int ivpu_shutdown(struct ivpu_device *vdev); +void ivpu_prepare_for_reset(struct ivpu_device *vdev);

static inline bool ivpu_is_mtl(struct ivpu_device *vdev) { diff --git a/drivers/accel/ivpu/ivpu_hw.h b/drivers/accel/ivpu/ivpu_hw.h index 50a9304ab09c..dac59f1c1e05 100644 --- a/drivers/accel/ivpu/ivpu_hw.h +++ b/drivers/accel/ivpu/ivpu_hw.h @@ -13,6 +13,7 @@ struct ivpu_hw_ops { int (*power_up)(struct ivpu_device *vdev); int (*boot_fw)(struct ivpu_device *vdev); int (*power_down)(struct ivpu_device *vdev); + int (*reset)(struct ivpu_device *vdev); bool (*is_idle)(struct ivpu_device *vdev); void (*wdt_disable)(struct ivpu_device *vdev); void (*diagnose_failure)(struct ivpu_device *vdev); @@ -90,6 +91,13 @@ static inline int ivpu_hw_power_down(struct ivpu_device *vdev) return vdev->hw->ops->power_down(vdev); };

+static inline int ivpu_hw_reset(struct ivpu_device *vdev) +{ + ivpu_dbg(vdev, PM, "HW reset\n"); + + return vdev->hw->ops->reset(vdev); +}; + static inline void ivpu_hw_wdt_disable(struct ivpu_device *vdev) { vdev->hw->ops->wdt_disable(vdev); diff --git a/drivers/accel/ivpu/ivpu_hw_mtl.c b/drivers/accel/ivpu/ivpu_hw_mtl.c index 2a5dd3a5dc46..d21c16b5e6f8 100644 --- a/drivers/accel/ivpu/ivpu_hw_mtl.c +++ b/drivers/accel/ivpu/ivpu_hw_mtl.c @@ -1041,6 +1041,7 @@ const struct ivpu_hw_ops ivpu_hw_mtl_ops = { .power_up = ivpu_hw_mtl_power_up, .is_idle = ivpu_hw_mtl_is_idle, .power_down = ivpu_hw_mtl_power_down, + .reset = ivpu_hw_mtl_reset, .boot_fw = ivpu_hw_mtl_boot_fw, .wdt_disable = ivpu_hw_mtl_wdt_disable, .diagnose_failure = ivpu_hw_mtl_diagnose_failure, diff --git a/drivers/accel/ivpu/ivpu_pm.c b/drivers/accel/ivpu/ivpu_pm.c index aa4d56dc52b3..86ec828dd1df 100644 --- a/drivers/accel/ivpu/ivpu_pm.c +++ b/drivers/accel/ivpu/ivpu_pm.c @@ -260,7 +260,8 @@ void ivpu_pm_reset_prepare_cb(struct pci_dev *pdev)

ivpu_dbg(vdev, PM, "Pre-reset..\n"); atomic_set(&vdev->pm->in_reset, 1); - ivpu_shutdown(vdev); + ivpu_prepare_for_reset(vdev); + ivpu_hw_reset(vdev); ivpu_pm_prepare_cold_boot(vdev); ivpu_jobs_abort_all(vdev); ivpu_dbg(vdev, PM, "Pre-reset done.\n");