From: Alexander Usyskin <[email protected]> Add device link with i915 as consumer and mei_pxp as supplier to ensure proper ordering of power flows.
V2: condition on absence of heci_pxp to filter out DG Signed-off-by: Alexander Usyskin <[email protected]> Signed-off-by: Alan Previn <[email protected]> --- drivers/gpu/drm/i915/pxp/intel_pxp_tee.c | 11 +++++++++++ drivers/gpu/drm/i915/pxp/intel_pxp_types.h | 3 +++ 2 files changed, 14 insertions(+) diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c index 73aa8015f828..b5bc0b87a1d0 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c @@ -127,6 +127,12 @@ static int i915_pxp_tee_component_bind(struct device *i915_kdev, intel_wakeref_t wakeref; int ret = 0; + if (!HAS_HECI_PXP(i915)) { + pxp->dev_link = device_link_add(i915_kdev, tee_kdev, DL_FLAG_STATELESS); + if (drm_WARN_ON(&i915->drm, !pxp->dev_link)) + return -ENODEV; + } + mutex_lock(&pxp->tee_mutex); pxp->pxp_component = data; pxp->pxp_component->tee_dev = tee_kdev; @@ -169,6 +175,11 @@ static void i915_pxp_tee_component_unbind(struct device *i915_kdev, mutex_lock(&pxp->tee_mutex); pxp->pxp_component = NULL; mutex_unlock(&pxp->tee_mutex); + + if (pxp->dev_link) { + device_link_del(pxp->dev_link); + pxp->dev_link = NULL; + } } static const struct component_ops i915_pxp_tee_component_ops = { diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h index 7dc5f08d1583..007de49e1ea4 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h @@ -32,6 +32,9 @@ struct intel_pxp { * which are protected by &tee_mutex. */ struct i915_pxp_component *pxp_component; + + /* @dev_link: Enforce module relationship for power management ordering. */ + struct device_link *dev_link; /** * @pxp_component_added: track if the pxp component has been added. * Set and cleared in tee init and fini functions respectively. -- 2.39.0
