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drm/panfrost: Implement ability to turn on/off regulators in suspend 

Some platforms/SoCs can power off the GPU entirely by completely cutting
off power, greatly enhancing battery time during system suspend: add a
new pm_feature GPU_PM_VREG_OFF to allow turning off the GPU regulators
during full suspend only on selected platforms.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231109102543.42971-6-angelogioacchino.delregno@collabora.com
This commit is contained in:
AngeloGioacchino Del Regno 2023-11-09 11:25:42 +01:00 committed by Steven Price
parent 32f175d426
commit 889a2b06f8
2 changed files with 20 additions and 1 deletions
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19
drivers/gpu/drm/panfrost/panfrost_device.c
View File

@ -431,10 +431,21 @@ static int panfrost_device_resume(struct device *dev)
struct panfrost_device *pfdev = dev_get_drvdata(dev);
int ret;
if (pfdev->comp->pm_features & BIT(GPU_PM_VREG_OFF)) {
unsigned long freq = pfdev->pfdevfreq.fast_rate;
struct dev_pm_opp *opp;
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
if (IS_ERR(opp))
return PTR_ERR(opp);
dev_pm_opp_set_opp(dev, opp);
dev_pm_opp_put(opp);
}
if (pfdev->comp->pm_features & BIT(GPU_PM_CLK_DIS)) {
ret = clk_enable(pfdev->clock);
if (ret)
return ret;
goto err_clk;
if (pfdev->bus_clock) {
ret = clk_enable(pfdev->bus_clock);
@ -455,6 +466,9 @@ static int panfrost_device_resume(struct device *dev)
err_bus_clk:
if (pfdev->comp->pm_features & BIT(GPU_PM_CLK_DIS))
clk_disable(pfdev->clock);
err_clk:
if (pfdev->comp->pm_features & BIT(GPU_PM_VREG_OFF))
dev_pm_opp_set_opp(dev, NULL);
return ret;
}
@ -474,6 +488,9 @@ static int panfrost_device_suspend(struct device *dev)
clk_disable(pfdev->clock);
}
if (pfdev->comp->pm_features & BIT(GPU_PM_VREG_OFF))
dev_pm_opp_set_opp(dev, NULL);
return 0;
}

2
drivers/gpu/drm/panfrost/panfrost_device.h
View File

@ -28,9 +28,11 @@ struct panfrost_perfcnt;
/**
* 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
*/
enum panfrost_gpu_pm {
GPU_PM_CLK_DIS,
GPU_PM_VREG_OFF,
};
struct panfrost_features {