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Commit 73559847 authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/radeon/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: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 47771669

drivers/gpu/drm/radeon/radeon_acpi.c

+17 −0
Original line number Diff line number Diff line
@@ -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>
@@ -32,6 +33,12 @@ 
#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