From 1b0f568d24cb7d750e99c48a6dab6e3246507fef Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Wed, 14 Sep 2016 14:04:29 -0400
Subject: [PATCH] drm/amdgpu/atif: Send a hotplug event when we get dgpu
 display request

On PX systems, if the platform supports hotplug events ATIF while the
dGPU is powered down, handle the event and alert userspace.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 5cd7b736a9de..5796539a0bcb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -25,6 +25,7 @@
 #include <linux/acpi.h>
 #include <linux/slab.h>
 #include <linux/power_supply.h>
+#include <linux/pm_runtime.h>
 #include <acpi/video.h>
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
@@ -333,6 +334,16 @@ int amdgpu_atif_handler(struct amdgpu_device *adev,
 #endif
 		}
 	}
+	if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
+		if ((adev->flags & AMD_IS_PX) &&
+		    amdgpu_atpx_dgpu_req_power_for_displays()) {
+			pm_runtime_get_sync(adev->ddev->dev);
+			/* Just fire off a uevent and let userspace tell us what to do */
+			drm_helper_hpd_irq_event(adev->ddev);
+			pm_runtime_mark_last_busy(adev->ddev->dev);
+			pm_runtime_put_autosuspend(adev->ddev->dev);
+		}
+	}
 	/* TODO: check other events */
 
 	/* We've handled the event, stop the notifier chain. The ACPI interface
-- 
2.20.1