From: Dave Gordon Date: Tue, 9 Aug 2016 14:19:19 +0000 (+0100) Subject: drm/i915/guc: doorbell reset should avoid used doorbells X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8888cd015458811d568a152238b0614c586df751;p=linux-beck.git drm/i915/guc: doorbell reset should avoid used doorbells guc_init_doorbell_hw() borrows the (currently single) GuC client to use in reinitialising ALL the doorbell registers (as the hardware doesn't reset them when the GuC is reset). As a prerequisite for accommodating multiple clients, it should only reset doorbells that are supposed to be disabled, avoiding those that are marked as in use by any client. Signed-off-by: Dave Gordon Reviewed-by: Tvrtko Ursulin Signed-off-by: Tvrtko Ursulin --- diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c index 03a5cef353eb..d5db0d1df298 100644 --- a/drivers/gpu/drm/i915/i915_guc_submission.c +++ b/drivers/gpu/drm/i915/i915_guc_submission.c @@ -697,7 +697,7 @@ guc_client_free(struct drm_i915_private *dev_priv, } /* - * Borrow the first client to set up & tear down every doorbell + * Borrow the first client to set up & tear down each unused doorbell * in turn, to ensure that all doorbell h/w is (re)initialised. */ static void guc_init_doorbell_hw(struct intel_guc *guc) @@ -713,6 +713,9 @@ static void guc_init_doorbell_hw(struct intel_guc *guc) i915_reg_t drbreg = GEN8_DRBREGL(i); u32 value = I915_READ(drbreg); + if (test_bit(i, guc->doorbell_bitmap)) + continue; + err = guc_update_doorbell_id(guc, client, i); /* Report update failure or unexpectedly active doorbell */ @@ -731,6 +734,9 @@ static void guc_init_doorbell_hw(struct intel_guc *guc) i915_reg_t drbreg = GEN8_DRBREGL(i); u32 value = I915_READ(drbreg); + if (test_bit(i, guc->doorbell_bitmap)) + continue; + if (i != db_id && (value & GUC_DOORBELL_ENABLED)) DRM_DEBUG_DRIVER("Doorbell %d (reg 0x%x) finally 0x%x\n", i, drbreg.reg, value);