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drm/tegra: sor: Implement runtime PM

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Use runtime PM to clock-(un)gate and (de)assert reset to the SOR
controller. This ties in nicely with atomic DPMS in that a runtime PM
reference is taken before a pipe is enabled and dropped after it has
been shut down.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2015-08-07 16:04:54 +02:00
parent 5234549b93
commit aaff8bd2e8
1 changed files with 58 additions and 19 deletions
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77
drivers/gpu/drm/tegra/sor.c
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@ -12,6 +12,7 @@
#include <linux/io.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
@ -1331,8 +1332,7 @@ static void tegra_sor_edp_disable(struct drm_encoder *encoder)
if (output->panel)
drm_panel_unprepare(output->panel);
reset_control_assert(sor->rst);
clk_disable_unprepare(sor->clk);
pm_runtime_put(sor->dev);
}
#if 0
@ -1393,11 +1393,7 @@ static void tegra_sor_edp_enable(struct drm_encoder *encoder)
state = to_sor_state(output->connector.state);
err = clk_prepare_enable(sor->clk);
if (err < 0)
dev_err(sor->dev, "failed to enable clock: %d\n", err);
reset_control_deassert(sor->rst);
pm_runtime_get_sync(sor->dev);
if (output->panel)
drm_panel_prepare(output->panel);
@ -1874,9 +1870,7 @@ static void tegra_sor_hdmi_disable(struct drm_encoder *encoder)
if (err < 0)
dev_err(sor->dev, "failed to power off HDMI rail: %d\n", err);
reset_control_assert(sor->rst);
usleep_range(1000, 2000);
clk_disable_unprepare(sor->clk);
pm_runtime_put(sor->dev);
}
static void tegra_sor_hdmi_enable(struct drm_encoder *encoder)
@ -1895,13 +1889,7 @@ static void tegra_sor_hdmi_enable(struct drm_encoder *encoder)
state = to_sor_state(output->connector.state);
mode = &encoder->crtc->state->adjusted_mode;
err = clk_prepare_enable(sor->clk);
if (err < 0)
dev_err(sor->dev, "failed to enable clock: %d\n", err);
usleep_range(1000, 2000);
reset_control_deassert(sor->rst);
pm_runtime_get_sync(sor->dev);
/* switch to safe parent clock */
err = tegra_sor_set_parent_clock(sor, sor->clk_safe);
@ -2531,6 +2519,9 @@ static int tegra_sor_probe(struct platform_device *pdev)
goto remove;
}
platform_set_drvdata(pdev, sor);
pm_runtime_enable(&pdev->dev);
INIT_LIST_HEAD(&sor->client.list);
sor->client.ops = &sor_client_ops;
sor->client.dev = &pdev->dev;
@ -2542,8 +2533,6 @@ static int tegra_sor_probe(struct platform_device *pdev)
goto remove;
}
platform_set_drvdata(pdev, sor);
return 0;
remove:
@ -2559,6 +2548,8 @@ static int tegra_sor_remove(struct platform_device *pdev)
struct tegra_sor *sor = platform_get_drvdata(pdev);
int err;
pm_runtime_disable(&pdev->dev);
err = host1x_client_unregister(&sor->client);
if (err < 0) {
dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
@ -2577,10 +2568,58 @@ static int tegra_sor_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int tegra_sor_suspend(struct device *dev)
{
struct tegra_sor *sor = dev_get_drvdata(dev);
int err;
err = reset_control_assert(sor->rst);
if (err < 0) {
dev_err(dev, "failed to assert reset: %d\n", err);
return err;
}
usleep_range(1000, 2000);
clk_disable_unprepare(sor->clk);
return 0;
}
static int tegra_sor_resume(struct device *dev)
{
struct tegra_sor *sor = dev_get_drvdata(dev);
int err;
err = clk_prepare_enable(sor->clk);
if (err < 0) {
dev_err(dev, "failed to enable clock: %d\n", err);
return err;
}
usleep_range(1000, 2000);
err = reset_control_deassert(sor->rst);
if (err < 0) {
dev_err(dev, "failed to deassert reset: %d\n", err);
clk_disable_unprepare(sor->clk);
return err;
}
return 0;
}
#endif
static const struct dev_pm_ops tegra_sor_pm_ops = {
SET_RUNTIME_PM_OPS(tegra_sor_suspend, tegra_sor_resume, NULL)
};
struct platform_driver tegra_sor_driver = {
.driver = {
.name = "tegra-sor",
.of_match_table = tegra_sor_of_match,
.pm = &tegra_sor_pm_ops,
},
.probe = tegra_sor_probe,
.remove = tegra_sor_remove,