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drm/i915: get a PC8 reference when enabling the power well
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In the current code, at haswell_modeset_global_resources, first we
decide if we want to enable/disable the power well, then we decide if
we want to enable/disable PC8. On the case where we're enabling PC8
this works fine, but on the case where we disable PC8 due to a non-eDP
monitor being enabled, we first enable the power well and then disable
PC8. Although wrong, this doesn't seem to be causing any problems now,
and we don't even see anything in dmesg. But the patches for runtime
D3 turn this problem into a real bug, so we need to fix it.

This fixes the "modeset-non-lpsp" subtest from the "pm_pc8" test from
intel-gpu-tools.

v2: - Rebase (i915_disable_power_well).
v3: - More reabase.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Paulo Zanoni authored and Daniel Vetter committed Dec 10, 2013
1 parent 7125ecb commit d62292c
Showing 1 changed file with 13 additions and 2 deletions.
15 changes: 13 additions & 2 deletions drivers/gpu/drm/i915/intel_pm.c
Original file line number Diff line number Diff line change
Expand Up @@ -5688,6 +5688,8 @@ static void hsw_set_power_well(struct drm_device *dev,
unsigned long irqflags;
uint32_t tmp;

WARN_ON(dev_priv->pc8.enabled);

tmp = I915_READ(HSW_PWR_WELL_DRIVER);
is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED;
enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST;
Expand Down Expand Up @@ -5747,17 +5749,26 @@ static void hsw_set_power_well(struct drm_device *dev,
static void __intel_power_well_get(struct drm_device *dev,
struct i915_power_well *power_well)
{
if (!power_well->count++ && power_well->set)
struct drm_i915_private *dev_priv = dev->dev_private;

if (!power_well->count++ && power_well->set) {
hsw_disable_package_c8(dev_priv);
power_well->set(dev, power_well, true);
}
}

static void __intel_power_well_put(struct drm_device *dev,
struct i915_power_well *power_well)
{
struct drm_i915_private *dev_priv = dev->dev_private;

WARN_ON(!power_well->count);

if (!--power_well->count && power_well->set && i915_disable_power_well)
if (!--power_well->count && power_well->set &&
i915_disable_power_well) {
power_well->set(dev, power_well, false);
hsw_enable_package_c8(dev_priv);
}
}

void intel_display_power_get(struct drm_device *dev,
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