From e0111ce0f5cbd2428333c3d3cd33ba42f1e148ad Mon Sep 17 00:00:00 2001 From: Daniele Ceraolo Spurio Date: Fri, 24 Sep 2021 12:14:41 -0700 Subject: [PATCH] drm/i915/pxp: set KCR reg init The setting is required by hardware to allow us doing further protection operation such as sending commands to GPU or TEE. The register needs to be re-programmed on resume, so for simplicitly we bundle the programming with the component binding, which is automatically called on resume. Further HW set-up operations will be added in the same location in follow-up patches, so get ready for them by using a couple of init/fini_hw wrappers instead of calling the KCR funcs directly. v3: move programming to component binding function, rework commit msg Signed-off-by: Huang, Sean Z Signed-off-by: Daniele Ceraolo Spurio Reviewed-by: Rodrigo Vivi Signed-off-by: Rodrigo Vivi Link: https://patchwork.freedesktop.org/patch/msgid/20210924191452.1539378-7-alan.previn.teres.alexis@intel.com --- drivers/gpu/drm/i915/pxp/intel_pxp.c | 26 ++++++++++++++++++++++++ drivers/gpu/drm/i915/pxp/intel_pxp.h | 3 +++ drivers/gpu/drm/i915/pxp/intel_pxp_tee.c | 5 +++++ 3 files changed, 34 insertions(+) diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c index 14ab7c97800ec..f7166dd71d8f0 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp.c +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c @@ -12,6 +12,23 @@ struct intel_gt *pxp_to_gt(const struct intel_pxp *pxp) return container_of(pxp, struct intel_gt, pxp); } +/* KCR register definitions */ +#define KCR_INIT _MMIO(0x320f0) +/* Setting KCR Init bit is required after system boot */ +#define KCR_INIT_ALLOW_DISPLAY_ME_WRITES REG_BIT(14) + +static void kcr_pxp_enable(struct intel_gt *gt) +{ + intel_uncore_write(gt->uncore, KCR_INIT, + _MASKED_BIT_ENABLE(KCR_INIT_ALLOW_DISPLAY_ME_WRITES)); +} + +static void kcr_pxp_disable(struct intel_gt *gt) +{ + intel_uncore_write(gt->uncore, KCR_INIT, + _MASKED_BIT_DISABLE(KCR_INIT_ALLOW_DISPLAY_ME_WRITES)); +} + static int create_vcs_context(struct intel_pxp *pxp) { static struct lock_class_key pxp_lock; @@ -79,5 +96,14 @@ void intel_pxp_fini(struct intel_pxp *pxp) intel_pxp_tee_component_fini(pxp); destroy_vcs_context(pxp); +} + +void intel_pxp_init_hw(struct intel_pxp *pxp) +{ + kcr_pxp_enable(pxp_to_gt(pxp)); +} +void intel_pxp_fini_hw(struct intel_pxp *pxp) +{ + kcr_pxp_disable(pxp_to_gt(pxp)); } diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h index 73acd879f2fb3..cd6560b2605ca 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp.h +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h @@ -17,6 +17,9 @@ static inline bool intel_pxp_is_enabled(const struct intel_pxp *pxp) struct intel_gt *pxp_to_gt(const struct intel_pxp *pxp); void intel_pxp_init(struct intel_pxp *pxp); void intel_pxp_fini(struct intel_pxp *pxp); + +void intel_pxp_init_hw(struct intel_pxp *pxp); +void intel_pxp_fini_hw(struct intel_pxp *pxp); #else static inline void intel_pxp_init(struct intel_pxp *pxp) { diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c index f1d8de832653c..0c0c7946e6a0d 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c @@ -33,6 +33,9 @@ static int i915_pxp_tee_component_bind(struct device *i915_kdev, pxp->pxp_component = data; pxp->pxp_component->tee_dev = tee_kdev; + /* the component is required to fully start the PXP HW */ + intel_pxp_init_hw(pxp); + return 0; } @@ -41,6 +44,8 @@ static void i915_pxp_tee_component_unbind(struct device *i915_kdev, { struct intel_pxp *pxp = i915_dev_to_pxp(i915_kdev); + intel_pxp_fini_hw(pxp); + pxp->pxp_component = NULL; } -- GitLab