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authorChris Wilson <chris@chris-wilson.co.uk>2019-01-14 14:21:24 +0000
committerChris Wilson <chris@chris-wilson.co.uk>2019-01-14 16:18:30 +0000
commit0e6e0be4c952372cc4c3f30bb8ddf9451f314503 (patch)
tree4f16c2754c9cd2992e576ed224711601b1be3ce8 /drivers/gpu/drm/i915/intel_crt.c
parentdrm/i915: Syntatic sugar for using intel_runtime_pm (diff)
downloadlinux-dev-0e6e0be4c952372cc4c3f30bb8ddf9451f314503.tar.xz
linux-dev-0e6e0be4c952372cc4c3f30bb8ddf9451f314503.zip
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
Diffstat (limited to 'drivers/gpu/drm/i915/intel_crt.c')
-rw-r--r--drivers/gpu/drm/i915/intel_crt.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 951e9bae6921..33bd2addcbdd 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -83,15 +83,17 @@ static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct intel_crt *crt = intel_encoder_to_crt(encoder);
+ 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_crt_port_enabled(dev_priv, crt->adpa_reg, pipe);
- intel_display_power_put(dev_priv, encoder->power_domain);
+ intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
return ret;
}
@@ -776,6 +778,7 @@ intel_crt_detect(struct drm_connector *connector,
struct drm_i915_private *dev_priv = to_i915(connector->dev);
struct intel_crt *crt = intel_attached_crt(connector);
struct intel_encoder *intel_encoder = &crt->base;
+ intel_wakeref_t wakeref;
int status, ret;
struct intel_load_detect_pipe tmp;
@@ -784,7 +787,8 @@ intel_crt_detect(struct drm_connector *connector,
force);
if (i915_modparams.load_detect_test) {
- intel_display_power_get(dev_priv, intel_encoder->power_domain);
+ wakeref = intel_display_power_get(dev_priv,
+ intel_encoder->power_domain);
goto load_detect;
}
@@ -792,7 +796,8 @@ intel_crt_detect(struct drm_connector *connector,
if (dmi_check_system(intel_spurious_crt_detect))
return connector_status_disconnected;
- intel_display_power_get(dev_priv, intel_encoder->power_domain);
+ wakeref = intel_display_power_get(dev_priv,
+ intel_encoder->power_domain);
if (I915_HAS_HOTPLUG(dev_priv)) {
/* We can not rely on the HPD pin always being correctly wired
@@ -847,7 +852,7 @@ load_detect:
}
out:
- intel_display_power_put(dev_priv, intel_encoder->power_domain);
+ intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
return status;
}
@@ -857,10 +862,12 @@ static int intel_crt_get_modes(struct drm_connector *connector)
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_crt *crt = intel_attached_crt(connector);
struct intel_encoder *intel_encoder = &crt->base;
- int ret;
+ intel_wakeref_t wakeref;
struct i2c_adapter *i2c;
+ int ret;
- intel_display_power_get(dev_priv, intel_encoder->power_domain);
+ wakeref = intel_display_power_get(dev_priv,
+ intel_encoder->power_domain);
i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
ret = intel_crt_ddc_get_modes(connector, i2c);
@@ -872,7 +879,7 @@ static int intel_crt_get_modes(struct drm_connector *connector)
ret = intel_crt_ddc_get_modes(connector, i2c);
out:
- intel_display_power_put(dev_priv, intel_encoder->power_domain);
+ intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
return ret;
}