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drm/i915: enable power wells on Haswell init 

This attempts to enable all the available power wells during the
initialization.

Those power wells can be enabled in parallel or on-demand, and disabled
when no longer needed, but this is out of scope of this initial
enablement. Proper tracking of who uses which power well will require
a considerable rework of our display handling, so we just leave them all
enabled when the driver is loaded for now.

v2: use more generic and future-proof code

Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Eugeni Dodonov 2012-05-09 15:37:16 -03:00 committed by Daniel Vetter
parent 6ee8bab09d
commit d0d3e51360
1 changed files with 36 additions and 0 deletions
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36
drivers/gpu/drm/i915/intel_pm.c
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@ -3559,6 +3559,37 @@ void intel_sanitize_pm(struct drm_device *dev)
dev_priv->display.sanitize_pm(dev);
}
/* Starting with Haswell, we have different power wells for
* different parts of the GPU. This attempts to enable them all.
*/
void intel_init_power_wells(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
unsigned long power_wells[] = {
HSW_PWR_WELL_CTL1,
HSW_PWR_WELL_CTL2,
HSW_PWR_WELL_CTL4
};
int i;
if (!IS_HASWELL(dev))
return;
mutex_lock(&dev->struct_mutex);
for (i = 0; i < ARRAY_SIZE(power_wells); i++) {
int well = I915_READ(power_wells[i]);
if ((well & HSW_PWR_WELL_STATE) == 0) {
I915_WRITE(power_wells[i], well & HSW_PWR_WELL_ENABLE);
if (wait_for(I915_READ(power_wells[i] & HSW_PWR_WELL_STATE), 20))
DRM_ERROR("Error enabling power well %lx\n", power_wells[i]);
}
}
mutex_unlock(&dev->struct_mutex);
}
/* Set up chip specific power management-related functions */
void intel_init_pm(struct drm_device *dev)
{
@ -3707,5 +3738,10 @@ void intel_init_pm(struct drm_device *dev)
else
dev_priv->display.get_fifo_size = i830_get_fifo_size;
}
/* We attempt to init the necessary power wells early in the initialization
* time, so the subsystems that expect power to be enabled can work.
*/
intel_init_power_wells(dev);
}