[PATCH] drm/i915/display: Skip unavailable power wells based on pipe mask

[Chaitanya Kumar Borah]

Some power wells are only relevant for certain display pipes. Add a check
to ensure we only allocate and initialize power wells whose associated
pipes are available on the platform.

This avoids unnecessary mapping of power wells, particularly when platforms
support a subset of pipes described in the power well descriptors.

Suggested-by: Imre Deak <imre.d...@intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.bo...@intel.com>
---
 .../i915/display/intel_display_power_map.c    | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power_map.c 
b/drivers/gpu/drm/i915/display/intel_display_power_map.c
index 77268802b55e..ca73e4084354 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power_map.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power_map.c
@@ -1748,6 +1748,16 @@ static void init_power_well_domains(const struct 
i915_power_well_instance *inst,
                for_each_power_well_instance_in_desc_list((_descs)->list, 
(_descs)->count, \
                                                          (_desc), (_inst))
 
+static bool
+is_power_well_available(struct intel_display *display, const struct 
i915_power_well_desc *desc)
+{
+       if (desc->irq_pipe_mask &&
+           !(desc->irq_pipe_mask & DISPLAY_RUNTIME_INFO(display)->pipe_mask))
+               return false;
+
+       return true;
+}
+
 static int
 __set_power_wells(struct i915_power_domains *power_domains,
                  const struct i915_power_well_desc_list *power_well_descs,
@@ -1763,8 +1773,10 @@ __set_power_wells(struct i915_power_domains 
*power_domains,
        int power_well_count = 0;
        int plt_idx = 0;
 
-       for_each_power_well_instance(power_well_descs, power_well_descs_sz, 
desc_list, desc, inst)
-               power_well_count++;
+       for_each_power_well_instance(power_well_descs, power_well_descs_sz, 
desc_list, desc, inst) {
+               if (is_power_well_available(display, desc))
+                       power_well_count++;
+       }
 
        power_domains->power_well_count = power_well_count;
        power_domains->power_wells =
@@ -1778,6 +1790,9 @@ __set_power_wells(struct i915_power_domains 
*power_domains,
                struct i915_power_well *pw = 
&power_domains->power_wells[plt_idx];
                enum i915_power_well_id id = inst->id;
 
+               if (!is_power_well_available(display, desc))
+                       continue;
+
                pw->desc = desc;
                drm_WARN_ON(display->drm,
                            overflows_type(inst - desc->instances->list, 
pw->instance_idx));
-- 
2.25.1