drm/i915: Remove posting-read for forcewake put

We can relax the requirement upon ourselves that the forcewake is
released immediately and just allow it to occur naturally following our
mmio request.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170323101944.21627-5-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 589f91c..bb0e89d 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -783,7 +783,6 @@ struct intel_uncore {
                u32 val_set;
                u32 val_clear;
                i915_reg_t reg_ack;
-               i915_reg_t reg_post;
                u32 val_reset;
        } fw_domain[FW_DOMAIN_ID_COUNT];
 

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 2e79ca1..5464c04 100644 (file)
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -105,15 +105,6 @@ fw_domain_put(struct drm_i915_private *i915,
        __raw_i915_write32(i915, d->reg_set, d->val_clear);
 }
 
-static inline void
-fw_domain_posting_read(struct drm_i915_private *i915,
-                      const struct intel_uncore_forcewake_domain *d)
-{
-       /* something from same cacheline, but not from the set register */
-       if (i915_mmio_reg_valid(d->reg_post))
-               __raw_posting_read(i915, d->reg_post);
-}
-
 static void
 fw_domains_get(struct drm_i915_private *i915, enum forcewake_domains fw_domains)
 {
@@ -141,28 +132,13 @@ fw_domains_put(struct drm_i915_private *i915, enum forcewake_domains fw_domains)
 
        GEM_BUG_ON(fw_domains & ~i915->uncore.fw_domains);
 
-       for_each_fw_domain_masked(d, fw_domains, i915, tmp) {
+       for_each_fw_domain_masked(d, fw_domains, i915, tmp)
                fw_domain_put(i915, d);
-               fw_domain_posting_read(i915, d);
-       }
 
        i915->uncore.fw_domains_active &= ~fw_domains;
 }
 
 static void
-fw_domains_posting_read(struct drm_i915_private *i915)
-{
-       struct intel_uncore_forcewake_domain *d;
-       unsigned int tmp;
-
-       /* No need to do for all, just do for first found */
-       for_each_fw_domain(d, i915, tmp) {
-               fw_domain_posting_read(i915, d);
-               break;
-       }
-}
-
-static void
 fw_domains_reset(struct drm_i915_private *i915,
                 enum forcewake_domains fw_domains)
 {
@@ -176,8 +152,6 @@ fw_domains_reset(struct drm_i915_private *i915,
 
        for_each_fw_domain_masked(d, fw_domains, i915, tmp)
                fw_domain_reset(i915, d);
-
-       fw_domains_posting_read(i915);
 }
 
 static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv)
@@ -1180,11 +1154,6 @@ static void fw_domain_init(struct drm_i915_private *dev_priv,
                d->val_clear = _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL);
        }
 
-       if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
-               d->reg_post = FORCEWAKE_ACK_VLV;
-       else if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv) || IS_GEN8(dev_priv))
-               d->reg_post = ECOBUS;
-
        d->id = domain_id;
 
        BUILD_BUG_ON(FORCEWAKE_RENDER != (1 << FW_DOMAIN_ID_RENDER));