gpu: nvgpu: vgpu: add PM domain support

vgpu "poweron" and "poweroff" routines now get invoked
using the PM domain callbacks, instead of the obsolete
gk20a_get_client/gk20a_put_client routines.

Bug 1570878

Change-Id: I9a5254936904f75cb3c8a14c2bf5066f919b6588
Signed-off-by: Aingara Paramakuru <aparamakuru@nvidia.com>
Reviewed-on: http://git-master/r/590492
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/vgpu/vgpu.c b/drivers/gpu/nvgpu/vgpu/vgpu.c
index 84fd6d18..82a0851e 100644
--- a/drivers/gpu/nvgpu/vgpu/vgpu.c
+++ b/drivers/gpu/nvgpu/vgpu/vgpu.c
@@ -304,6 +304,27 @@ done:
         return err;
 }
 
+static int vgpu_pm_initialise_domain(struct platform_device *pdev)
+{
+        struct gk20a_platform *platform = platform_get_drvdata(pdev);
+        struct dev_power_governor *pm_domain_gov = NULL;
+        struct generic_pm_domain *domain = &platform->g->pd;
+
+        domain->name = "gpu";
+
+#ifdef CONFIG_PM_RUNTIME
+        pm_domain_gov = &pm_domain_always_on_gov;
+#endif
+
+        pm_genpd_init(domain, pm_domain_gov, true);
+
+        domain->dev_ops.save_state = vgpu_pm_prepare_poweroff;
+        domain->dev_ops.restore_state = vgpu_pm_finalize_poweron;
+
+        device_set_wakeup_capable(&pdev->dev, 0);
+        return pm_genpd_add_device(domain, &pdev->dev);
+}
+
 static int vgpu_pm_init(struct platform_device *dev)
 {
         int err = 0;
@@ -311,6 +332,11 @@ static int vgpu_pm_init(struct platform_device *dev)
         gk20a_dbg_fn("");
 
         pm_runtime_enable(&dev->dev);
+
+        /* genpd will take care of runtime power management if it is enabled */
+        if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
+                err = vgpu_pm_initialise_domain(dev);
+
         return err;
 }