drm/i915: Markup paired operations on display power domains
The majority of runtime-pm operations are bounded and scoped within a
function; these are easy to verify that the wakeref are handled
correctly. We can employ the compiler to help us, and reduce the number
of wakerefs tracked when debugging, by passing around cookies provided
by the various rpm_get functions to their rpm_put counterpart. This
makes the pairing explicit, and given the required wakeref cookie the
compiler can verify that we pass an initialised value to the rpm_put
(quite handy for double checking error paths).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190114142129.24398-16-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 83b01cd..ab72577 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3989,10 +3989,12 @@ void skl_pipe_ddb_get_hw_state(struct intel_crtc *crtc,
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
enum intel_display_power_domain power_domain;
enum pipe pipe = crtc->pipe;
+ intel_wakeref_t wakeref;
enum plane_id plane_id;
power_domain = POWER_DOMAIN_PIPE(pipe);
- if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
+ wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
+ if (!wakeref)
return;
for_each_plane_id_on_crtc(crtc, plane_id)
@@ -4001,7 +4003,7 @@ void skl_pipe_ddb_get_hw_state(struct intel_crtc *crtc,
&ddb_y[plane_id],
&ddb_uv[plane_id]);
- intel_display_power_put(dev_priv, power_domain);
+ intel_display_power_put(dev_priv, power_domain, wakeref);
}
void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,