drm/amd/display: Change dc_set_power_state() to bool instead of int

DC code is reused by other OSes and so Linux return codes don't
make sense.  Change dc_set_power_state() to boolean and add a wrapper
dm_set_power_state() to return a Linux error code for the memory
allocation failure.
Suggested-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -2638,6 +2638,11 @@ static void hpd_rx_irq_work_suspend(struct amdgpu_display_manager *dm)
 	}
 }
 
+static int dm_set_power_state(struct dc *dc, enum dc_acpi_cm_power_state power_state)
+{
+	return dc_set_power_state(dc, power_state) ? 0 : -ENOMEM;
+}
+
 static int dm_suspend(void *handle)
 {
 	struct amdgpu_device *adev = handle;
@@ -2671,7 +2676,7 @@ static int dm_suspend(void *handle)
 
 	hpd_rx_irq_work_suspend(dm);
 
-	return dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D3);
+	return dm_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D3);
 }
 
 struct amdgpu_dm_connector *
@@ -2865,7 +2870,7 @@ static int dm_resume(void *handle)
 		if (r)
 			DRM_ERROR("DMUB interface failed to initialize: status=%d\n", r);
 
-		r = dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D0);
+		r = dm_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D0);
 		if (r)
 			return r;
 
@@ -2917,7 +2922,7 @@ static int dm_resume(void *handle)
 	}
 
 	/* power on hardware */
-	r = dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D0);
+	r = dm_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D0);
 	if (r)
 		return r;
 

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -4723,7 +4723,7 @@ void dc_power_down_on_boot(struct dc *dc)
 		dc->hwss.power_down_on_boot(dc);
 }
 
-int dc_set_power_state(
+bool dc_set_power_state(
 	struct dc *dc,
 	enum dc_acpi_cm_power_state power_state)
 {
@@ -4731,7 +4731,7 @@ int dc_set_power_state(
 	struct display_mode_lib *dml;
 
 	if (!dc->current_state)
-		return 0;
+		return true;
 
 	switch (power_state) {
 	case DC_ACPI_CM_POWER_STATE_D0:
@@ -4758,7 +4758,7 @@ int dc_set_power_state(
 
 		ASSERT(dml);
 		if (!dml)
-			return -ENOMEM;
+			return false;
 
 		/* Preserve refcount */
 		refcount = dc->current_state->refcount;
@@ -4777,7 +4777,7 @@ int dc_set_power_state(
 		break;
 	}
 
-	return 0;
+	return true;
 }
 
 void dc_resume(struct dc *dc)

drivers/gpu/drm/amd/display/dc/dc.h

@@ -2283,7 +2283,7 @@ void dc_notify_vsync_int_state(struct dc *dc, struct dc_stream_state *stream, bo
 
 /* Power Interfaces */
 
-int dc_set_power_state(
+bool dc_set_power_state(
 		struct dc *dc,
 		enum dc_acpi_cm_power_state power_state);
 void dc_resume(struct dc *dc);