as per:
https://www.kernel.org/doc/html/latest/driver-api/pm/devices.html
The prepare callback is required to support the DPM_FLAG_SMART_SUSPEND
driver flag. This allows runtime pm to auto complete when the
system goes into suspend avoiding a wake up on suspend and on resume.
Apply this for hybrid gfx and BOCO systems where d3cold is
provided by the ACPI platform.
v2: check if device is runtime suspended in prepare.
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
#include <linux/vga_switcheroo.h>
#include <drm/drm_probe_helper.h>
#include <linux/mmu_notifier.h>
#include <linux/vga_switcheroo.h>
#include <drm/drm_probe_helper.h>
#include <linux/mmu_notifier.h>
+#include <linux/suspend.h>
#include "amdgpu.h"
#include "amdgpu_irq.h"
#include "amdgpu.h"
#include "amdgpu_irq.h"
+static int amdgpu_pmops_prepare(struct device *dev)
+{
+ struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+ /* Return a positive number here so
+ * DPM_FLAG_SMART_SUSPEND works properly
+ */
+ if ((amdgpu_device_supports_atpx(drm_dev) &&
+ amdgpu_is_atpx_hybrid()) ||
+ amdgpu_device_supports_boco(drm_dev))
+ return pm_runtime_suspended(dev) &&
+ pm_suspend_via_firmware();
+
+ return 0;
+}
+
+static void amdgpu_pmops_complete(struct device *dev)
+{
+ /* nothing to do */
+}
+
static int amdgpu_pmops_suspend(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
static int amdgpu_pmops_suspend(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
}
static const struct dev_pm_ops amdgpu_pm_ops = {
}
static const struct dev_pm_ops amdgpu_pm_ops = {
+ .prepare = amdgpu_pmops_prepare,
+ .complete = amdgpu_pmops_complete,
.suspend = amdgpu_pmops_suspend,
.resume = amdgpu_pmops_resume,
.freeze = amdgpu_pmops_freeze,
.suspend = amdgpu_pmops_suspend,
.resume = amdgpu_pmops_resume,
.freeze = amdgpu_pmops_freeze,