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authorGeert Uytterhoeven <geert+renesas@glider.be>2018-07-20 15:27:39 +0300
committerTejun Heo <tj@kernel.org>2018-07-23 18:18:43 +0300
commit1ecd34ddf63ef1d4015da5e5de6881e6845a6b0a (patch)
tree833769609ee48758c8d4b196a8ec7d09de4110d1 /drivers/ata/sata_rcar.c
parentc01e229f24eb133ca85453597447477974b07f20 (diff)
downloadlinux-1ecd34ddf63ef1d4015da5e5de6881e6845a6b0a.tar.xz
ata: sata_rcar: Add rudimentary Runtime PM support
Replace the explicit clock handling to enable/disable the SATA module by calls to Runtime PM. This makes the driver independent of actual SoC clock/power hierarchies, and is needed to support virtualization, where the guest is not in full control of power management. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata/sata_rcar.c')
-rw-r--r--drivers/ata/sata_rcar.c40
1 files changed, 18 insertions, 22 deletions
diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
index f972c2c5ebd3..3b8ed10bfb8f 100644
--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -17,7 +17,7 @@
#include <linux/libata.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
-#include <linux/clk.h>
+#include <linux/pm_runtime.h>
#include <linux/err.h>
#define DRV_NAME "sata_rcar"
@@ -152,7 +152,6 @@ enum sata_rcar_type {
struct sata_rcar_priv {
void __iomem *base;
- struct clk *clk;
enum sata_rcar_type type;
};
@@ -897,21 +896,17 @@ static int sata_rcar_probe(struct platform_device *pdev)
return -ENOMEM;
priv->type = (enum sata_rcar_type)of_device_get_match_data(dev);
- priv->clk = devm_clk_get(dev, NULL);
- if (IS_ERR(priv->clk)) {
- dev_err(dev, "failed to get access to sata clock\n");
- return PTR_ERR(priv->clk);
- }
- ret = clk_prepare_enable(priv->clk);
- if (ret)
- return ret;
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
+ goto err_pm_disable;
host = ata_host_alloc(dev, 1);
if (!host) {
dev_err(dev, "ata_host_alloc failed\n");
ret = -ENOMEM;
- goto cleanup;
+ goto err_pm_put;
}
host->private_data = priv;
@@ -920,7 +915,7 @@ static int sata_rcar_probe(struct platform_device *pdev)
priv->base = devm_ioremap_resource(dev, mem);
if (IS_ERR(priv->base)) {
ret = PTR_ERR(priv->base);
- goto cleanup;
+ goto err_pm_put;
}
/* setup port */
@@ -934,9 +929,10 @@ static int sata_rcar_probe(struct platform_device *pdev)
if (!ret)
return 0;
-cleanup:
- clk_disable_unprepare(priv->clk);
-
+err_pm_put:
+ pm_runtime_put(dev);
+err_pm_disable:
+ pm_runtime_disable(dev);
return ret;
}
@@ -954,7 +950,8 @@ static int sata_rcar_remove(struct platform_device *pdev)
iowrite32(0, base + SATAINTSTAT_REG);
iowrite32(0x7ff, base + SATAINTMASK_REG);
- clk_disable_unprepare(priv->clk);
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
return 0;
}
@@ -974,7 +971,7 @@ static int sata_rcar_suspend(struct device *dev)
/* mask */
iowrite32(0x7ff, base + SATAINTMASK_REG);
- clk_disable_unprepare(priv->clk);
+ pm_runtime_put(dev);
}
return ret;
@@ -987,8 +984,8 @@ static int sata_rcar_resume(struct device *dev)
void __iomem *base = priv->base;
int ret;
- ret = clk_prepare_enable(priv->clk);
- if (ret)
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
return ret;
if (priv->type == RCAR_GEN3_SATA) {
@@ -1012,11 +1009,10 @@ static int sata_rcar_resume(struct device *dev)
static int sata_rcar_restore(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
- struct sata_rcar_priv *priv = host->private_data;
int ret;
- ret = clk_prepare_enable(priv->clk);
- if (ret)
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
return ret;
sata_rcar_setup_port(host);