drm/radeon/atif: Send a hotplug event when we get dgpu display request
authorAlex Deucher <alexander.deucher@amd.com>
Wed, 14 Sep 2016 18:15:34 +0000 (14:15 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Thu, 22 Sep 2016 14:30:58 +0000 (10:30 -0400)
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/radeon/radeon_acpi.c

index 31c9a92d6a1b89da90863e761fa4701f15d3ad3f..6efbd65c929efc28135056c4077ed979e18017c3 100644 (file)
@@ -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>
 #include "radeon_acpi.h"
 #include "atom.h"
 
+#if defined(CONFIG_VGA_SWITCHEROO)
+bool radeon_atpx_dgpu_req_power_for_displays(void);
+#else
+static inline bool radeon_atpx_dgpu_req_power_for_displays(void) { return false; }
+#endif
+
 #define ACPI_AC_CLASS           "ac_adapter"
 
 extern void radeon_pm_acpi_event_handler(struct radeon_device *rdev);
@@ -394,6 +401,16 @@ int radeon_atif_handler(struct radeon_device *rdev,
 #endif
                }
        }
+       if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
+               if ((rdev->flags & RADEON_IS_PX) &&
+                   radeon_atpx_dgpu_req_power_for_displays()) {
+                       pm_runtime_get_sync(rdev->ddev->dev);
+                       /* Just fire off a uevent and let userspace tell us what to do */
+                       drm_helper_hpd_irq_event(rdev->ddev);
+                       pm_runtime_mark_last_busy(rdev->ddev->dev);
+                       pm_runtime_put_autosuspend(rdev->ddev->dev);
+               }
+       }
        /* TODO: check other events */
 
        /* We've handled the event, stop the notifier chain. The ACPI interface