To implement workaround for underrun on idle PSR HW issue (Wa_16025596647) we need to have current configured DC state available. Add new interface for this purpose.
Signed-off-by: Jouni Högander <[email protected]> --- .../drm/i915/display/intel_display_power.c | 29 +++++++++++++++++++ .../drm/i915/display/intel_display_power.h | 1 + 2 files changed, 30 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c index f7171e6932dc3..6dfe85a5528fc 100644 --- a/drivers/gpu/drm/i915/display/intel_display_power.c +++ b/drivers/gpu/drm/i915/display/intel_display_power.c @@ -322,6 +322,35 @@ void intel_display_power_set_target_dc_state(struct intel_display *display, mutex_unlock(&power_domains->lock); } +/** + * intel_display_power_get_current_dc_state - Set target dc state. + * @display: display device + * + * This function set the "DC off" power well target_dc_state, + * based upon this target_dc_stste, "DC off" power well will + * enable desired DC state. + */ +u32 intel_display_power_get_current_dc_state(struct intel_display *display) +{ + struct i915_power_well *power_well; + struct i915_power_domains *power_domains = &display->power.domains; + u32 current_dc_state = DC_STATE_DISABLE; + + mutex_lock(&power_domains->lock); + power_well = lookup_power_well(display, SKL_DISP_DC_OFF); + + if (drm_WARN_ON(display->drm, !power_well)) + goto unlock; + + current_dc_state = intel_power_well_is_enabled(display, power_well) ? + DC_STATE_DISABLE : power_domains->target_dc_state; + +unlock: + mutex_unlock(&power_domains->lock); + + return current_dc_state; +} + static void __async_put_domains_mask(struct i915_power_domains *power_domains, struct intel_power_domain_mask *mask) { diff --git a/drivers/gpu/drm/i915/display/intel_display_power.h b/drivers/gpu/drm/i915/display/intel_display_power.h index 1b53d67f9b60d..f8813b0e16dfb 100644 --- a/drivers/gpu/drm/i915/display/intel_display_power.h +++ b/drivers/gpu/drm/i915/display/intel_display_power.h @@ -183,6 +183,7 @@ void intel_display_power_suspend(struct intel_display *display); void intel_display_power_resume(struct intel_display *display); void intel_display_power_set_target_dc_state(struct intel_display *display, u32 state); +u32 intel_display_power_get_current_dc_state(struct intel_display *display); bool intel_display_power_is_enabled(struct intel_display *display, enum intel_display_power_domain domain); -- 2.43.0
