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drm/i915: Markup paired operations on display power domains

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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
This commit is contained in:
Chris Wilson
2019-01-14 14:21:24 +00:00
parent d4225a535b
commit 0e6e0be4c9
23 changed files with 346 additions and 189 deletions
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8
drivers/gpu/drm/i915/intel_lvds.c
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@@ -94,15 +94,17 @@ static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
intel_wakeref_t wakeref;
bool ret;
if (!intel_display_power_get_if_enabled(dev_priv,
encoder->power_domain))
wakeref = intel_display_power_get_if_enabled(dev_priv,
encoder->power_domain);
if (!wakeref)
return false;
ret = intel_lvds_port_enabled(dev_priv, lvds_encoder->reg, pipe);
intel_display_power_put(dev_priv, encoder->power_domain);
intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
return ret;
}