drm/i915: support for multiple power wells
HW generations so far had only one always-on power well and optionally
one dynamic power well. Upcoming HW gens may have multiple dynamic power
wells, so add some infrastructure to support them.
The idea is to keep the existing power domain API used by the rest of
the driver and create a mapping between these power domains and the
underlying power wells. This mapping can differ from one HW to another
but high level driver code doesn't need to know about this. Through the
existing get/put API it would just ask for a given power domain and the
power domain framework would make sure the relevant power wells get
enabled in the right order.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Paulo Zanoni <paulo.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4ef8e81..bb09dbf 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -950,21 +950,27 @@
/* Power well structure for haswell */
struct i915_power_well {
+ const char *name;
/* power well enable/disable usage count */
int count;
+ unsigned long domains;
+ void *data;
+ void (*set)(struct drm_device *dev, struct i915_power_well *power_well,
+ bool enable);
+ bool (*is_enabled)(struct drm_device *dev,
+ struct i915_power_well *power_well);
};
-#define I915_MAX_POWER_WELLS 1
-
struct i915_power_domains {
/*
* Power wells needed for initialization at driver init and suspend
* time are on. They are kept on until after the first modeset.
*/
bool init_power_on;
+ int power_well_count;
struct mutex lock;
- struct i915_power_well power_wells[I915_MAX_POWER_WELLS];
+ struct i915_power_well *power_wells;
};
struct i915_dri1_state {