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drm/i915: fix WARNs when reading DDI state while suspended

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If runtime PM is enabled and we unset all modes, we will runtime
suspend after __intel_set_mode() , then function
intel_modeset_check_state() will try to read the HW state while it is
suspended and trigger lots of WARNs because it shouldn't be reading
registers.

So on this patch we make intel_ddi_connector_get_hw_state() return
false in case the power domain is disabled, and we also make
intel_display_power_enabled() return false in case the device is
suspended. Notice that we can't just use
intel_display_power_enabled_sw() because while the driver is being
initialized the power domain refcounts are not reflecting the real
state of the hardware.

Just for reference, I have previously published an alternate patch for
this problem, called "drm/i915: get runtime PM at intel_set_mode".

Testcase: igt/pm_pc8
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni 2014-04-01 14:55:12 -03:00 committed by Daniel Vetter
parent a23dc6584f
commit 882244a340
2 changed files with 8 additions and 0 deletions
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5
drivers/gpu/drm/i915/intel_ddi.c
View File

@ -1108,8 +1108,13 @@ bool intel_ddi_connector_get_hw_state(struct intel_connector *intel_connector)
enum port port = intel_ddi_get_encoder_port(intel_encoder);
enum pipe pipe = 0;
enum transcoder cpu_transcoder;
enum intel_display_power_domain power_domain;
uint32_t tmp;
power_domain = intel_display_port_power_domain(intel_encoder);
if (!intel_display_power_enabled(dev_priv, power_domain))
return false;
if (!intel_encoder->get_hw_state(intel_encoder, &pipe))
return false;

3
drivers/gpu/drm/i915/intel_pm.c
View File

@ -5280,6 +5280,9 @@ bool intel_display_power_enabled(struct drm_i915_private *dev_priv,
bool is_enabled;
int i;
if (dev_priv->pm.suspended)
return false;
power_domains = &dev_priv->power_domains;
is_enabled = true;