diff options
| author | Philippe Simons <simons.philippe@gmail.com> | 2025-04-03 07:52:08 +0200 |
|---|---|---|
| committer | Steven Price <steven.price@arm.com> | 2025-04-28 10:23:48 +0100 |
| commit | d76ebdf4aa829cd05a6bc8610efbbe17d4ecc8e8 (patch) | |
| tree | 9b8473b1e5b32159224e00514953a54facac9a91 | |
| parent | a22e0051f9eb2281b181218d97f77cebc299310d (diff) | |
drm/panfrost: Add PM runtime flag
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
| -rw-r--r-- | drivers/gpu/drm/panfrost/panfrost_device.c | 33 | ||||
| -rw-r--r-- | drivers/gpu/drm/panfrost/panfrost_device.h | 3 |
2 files changed, 36 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c index a45e4addcc19..93d48e97ce10 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.c +++ b/drivers/gpu/drm/panfrost/panfrost_device.c @@ -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; } diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h index ad95f2ed31d9..dcff70f905cd 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.h +++ b/drivers/gpu/drm/panfrost/panfrost_device.h @@ -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 }; /** |