drm/i915: fix documentation build warnings

Just a straightforward bag of fixes for a clean htmldocs build.
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190605095657.23601-2-jani.nikula@intel.com

Documentation/gpu/i915.rst

@@ -475,12 +475,6 @@ i915_context_create and i915_context_free
 .. kernel-doc:: drivers/gpu/drm/i915/i915_trace.h
    :doc: i915_context_create and i915_context_free tracepoints
 
-switch_mm
----------
-
-.. kernel-doc:: drivers/gpu/drm/i915/i915_trace.h
-   :doc: switch_mm tracepoint
-
 Perf
 ====
 

drivers/gpu/drm/i915/i915_reg.h

@@ -153,7 +153,7 @@
  * REG_FIELD_PREP() - Prepare a u32 bitfield value
  * @__mask: shifted mask defining the field's length and position
  * @__val: value to put in the field
-
+ *
  * Local copy of FIELD_PREP() to generate an integer constant expression, force
  * u32 and for consistency with REG_FIELD_GET(), REG_BIT() and REG_GENMASK().
  *

drivers/gpu/drm/i915/i915_vma.h

@@ -40,6 +40,8 @@
 enum i915_cache_level;
 
 /**
+ * DOC: Virtual Memory Address
+ *
  * A VMA represents a GEM BO that is bound into an address space. Therefore, a
  * VMA's presence cannot be guaranteed before binding, or after unbinding the
  * object into/from the address space.

drivers/gpu/drm/i915/intel_guc_fwif.h

@@ -500,6 +500,8 @@ enum guc_log_buffer_type {
 };
 
 /**
+ * struct guc_log_buffer_state - GuC log buffer state
+ *
  * Below state structure is used for coordination of retrieval of GuC firmware
  * logs. Separate state is maintained for each log buffer type.
  * read_ptr points to the location where i915 read last in log buffer and

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -391,8 +391,6 @@ static intel_wakeref_t __intel_runtime_pm_get(struct drm_i915_private *i915,
  * asynchronous PM management from display code) and ensures that it is powered
  * up. Raw references are not considered during wakelock assert checks.
  *
- * Returns:
- * True when the power domain is enabled, false otherwise.
  * Any runtime pm reference obtained by this function must have a symmetric
  * call to intel_runtime_pm_put_raw() to release the reference again.
  *