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Message-ID: <1371117218-2326-4-git-send-email-mkulkarni@nvidia.com>
Date: Thu, 13 Jun 2013 15:23:37 +0530
From: Mayuresh Kulkarni <mkulkarni@...dia.com>
To: <tbergstrom@...dia.com>, <amerilainen@...dia.com>,
<thierry.reding@...onic-design.de>, <airlied@...hat.com>,
<dri-devel@...ts.freedesktop.org>, <linux-tegra@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>,
Mayuresh Kulkarni <mkulkarni@...dia.com>
Subject: [PATCH v2 3/4] gpu: host1x: add runtime pm support for dc
As of now, the dc clock is enabled in its .probe via
runtime pm and disabled in .remove
Signed-off-by: Mayuresh Kulkarni <mkulkarni@...dia.com>
---
drivers/gpu/host1x/drm/dc.c | 60 +++++++++++++++++++++++++++++++++++++++++----
1 file changed, 55 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/host1x/drm/dc.c b/drivers/gpu/host1x/drm/dc.c
index 5360e5a..8e669a9 100644
--- a/drivers/gpu/host1x/drm/dc.c
+++ b/drivers/gpu/host1x/drm/dc.c
@@ -13,6 +13,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/clk/tegra.h>
+#include <linux/pm_runtime.h>
#include "host1x_client.h"
#include "dc.h"
@@ -1128,9 +1129,7 @@ static int tegra_dc_probe(struct platform_device *pdev)
return PTR_ERR(dc->clk);
}
- err = clk_prepare_enable(dc->clk);
- if (err < 0)
- return err;
+ platform_set_drvdata(pdev, dc);
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dc->regs = devm_ioremap_resource(&pdev->dev, regs);
@@ -1147,6 +1146,15 @@ static int tegra_dc_probe(struct platform_device *pdev)
dc->client.ops = &dc_client_ops;
dc->client.dev = &pdev->dev;
+#ifdef CONFIG_PM_RUNTIME
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+#else
+ err = clk_prepare_enable(dc->clk);
+ if (err < 0)
+ return err;
+#endif
+
err = tegra_dc_rgb_probe(dc);
if (err < 0 && err != -ENODEV) {
dev_err(&pdev->dev, "failed to probe RGB output: %d\n", err);
@@ -1160,8 +1168,6 @@ static int tegra_dc_probe(struct platform_device *pdev)
return err;
}
- platform_set_drvdata(pdev, dc);
-
return 0;
}
@@ -1178,11 +1184,52 @@ static int tegra_dc_remove(struct platform_device *pdev)
return err;
}
+#ifdef CONFIG_PM_RUNTIME
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+#endif
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_RUNTIME
+static int tegra_dc_runtime_suspend(struct device *dev)
+{
+ struct tegra_dc *dc;
+
+ dc = dev_get_drvdata(dev);
+ if (!dc)
+ return -EINVAL;
+
clk_disable_unprepare(dc->clk);
return 0;
}
+static int tegra_dc_runtime_resume(struct device *dev)
+{
+ int err = 0;
+ struct tegra_dc *dc;
+
+ dc = dev_get_drvdata(dev);
+ if (!dc)
+ return -EINVAL;
+
+ err = clk_prepare_enable(dc->clk);
+ if (err < 0)
+ dev_err(dev, "failed to enable clock\n");
+
+ return err;
+}
+#endif /* CONFIG_PM_RUNTIME */
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops tegra_dc_pm_ops = {
+ SET_RUNTIME_PM_OPS(tegra_dc_runtime_suspend,
+ tegra_dc_runtime_resume, NULL)
+};
+#endif
+
static struct of_device_id tegra_dc_of_match[] = {
{ .compatible = "nvidia,tegra30-dc", },
{ .compatible = "nvidia,tegra20-dc", },
@@ -1194,6 +1241,9 @@ struct platform_driver tegra_dc_driver = {
.name = "tegra-dc",
.owner = THIS_MODULE,
.of_match_table = tegra_dc_of_match,
+#ifdef CONFIG_PM
+ .pm = &tegra_dc_pm_ops,
+#endif
},
.probe = tegra_dc_probe,
.remove = tegra_dc_remove,
--
1.8.1.5
--
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