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drm/panfrost: Add PM runtime flag

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When the GPU is the only device attached to a single power domain,
core genpd disable and enable it when gpu enter and leave runtime suspend.

Some power-domain requires a sequence before disabled,
and the reverse when enabled.

Add GPU_PM_RT flag, and implement in
panfrost_device_runtime_suspend/resume.

Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Philippe Simons <simons.philippe@gmail.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20250403055210.54486-2-simons.philippe@gmail.com
This commit is contained in:
Philippe Simons
2025-04-03 07:52:08 +02:00
committed by Steven Price
parent a22e0051f9
commit d76ebdf4aa
2 changed files with 36 additions and 0 deletions
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33
drivers/gpu/drm/panfrost/panfrost_device.c
View File

@@ -406,11 +406,36 @@ void panfrost_device_reset(struct panfrost_device *pfdev)
static int panfrost_device_runtime_resume(struct device *dev)
{
struct panfrost_device *pfdev = dev_get_drvdata(dev);
int ret;
if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
ret = reset_control_deassert(pfdev->rstc);
if (ret)
return ret;
ret = clk_enable(pfdev->clock);
if (ret)
goto err_clk;
if (pfdev->bus_clock) {
ret = clk_enable(pfdev->bus_clock);
if (ret)
goto err_bus_clk;
}
}
panfrost_device_reset(pfdev);
panfrost_devfreq_resume(pfdev);
return 0;
err_bus_clk:
if (pfdev->comp->pm_features & BIT(GPU_PM_RT))
clk_disable(pfdev->clock);
err_clk:
if (pfdev->comp->pm_features & BIT(GPU_PM_RT))
reset_control_assert(pfdev->rstc);
return ret;
}
static int panfrost_device_runtime_suspend(struct device *dev)
@@ -426,6 +451,14 @@ static int panfrost_device_runtime_suspend(struct device *dev)
panfrost_gpu_suspend_irq(pfdev);
panfrost_gpu_power_off(pfdev);
if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
if (pfdev->bus_clock)
clk_disable(pfdev->bus_clock);
clk_disable(pfdev->clock);
reset_control_assert(pfdev->rstc);
}
return 0;
}

3
drivers/gpu/drm/panfrost/panfrost_device.h
View File

@@ -36,10 +36,13 @@ enum panfrost_drv_comp_bits {
* enum panfrost_gpu_pm - Supported kernel power management features
* @GPU_PM_CLK_DIS: Allow disabling clocks during system suspend
* @GPU_PM_VREG_OFF: Allow turning off regulators during system suspend
* @GPU_PM_RT: Allow disabling clocks and asserting the reset control during
* system runtime suspend
*/
enum panfrost_gpu_pm {
GPU_PM_CLK_DIS,
GPU_PM_VREG_OFF,
GPU_PM_RT
};
/**