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Message-Id: <1445485034-12024-1-git-send-email-shawn.lin@rock-chips.com>
Date: Thu, 22 Oct 2015 11:37:14 +0800
From: Shawn Lin <shawn.lin@...k-chips.com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
Michal Simek <michal.simek@...inx.com>,
Soren Brinkmann <soren.brinkmann@...inx.com>
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
Shawn Lin <shawn.lin@...k-chips.com>
Subject: [PATCH v4 4/4] mmc: sdhci-of-arasan: add runtime pm support
This patch add runtime_suspend and runtime_resume for
sdhci-of-arasan. Currently we also power-off phy at
runtime_suspend for power-saving.
Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
Serise-changes: 4
- remove ifdef for PM callback statement
- fix missing pm_runtime_set_active
- remove pm_runtime_dont_use_autosuspend from remove hook
- add pm_runtime_force_suspend|resume for PM callback to
deal with suspend invoked from rpm
- remove wrappers of phy ops
---
Changes in v2: None
drivers/mmc/host/sdhci-of-arasan.c | 85 ++++++++++++++++++++++++++++++++++++--
1 file changed, 82 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 2d327d4..b044df7 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -30,6 +30,8 @@
#define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
#define CLK_CTRL_TIMEOUT_MIN_EXP 13
+#define ARASAN_RPM_DELAY_MS 50
+
/**
* struct sdhci_arasan_data
* @clk_ahb: Pointer to the AHB clock
@@ -71,6 +73,46 @@ static struct sdhci_pltfm_data sdhci_arasan_pdata = {
SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
};
+#ifdef CONFIG_PM
+static int sdhci_arasan_runtime_suspend(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
+ int ret;
+
+ ret = sdhci_runtime_suspend_host(host);
+ if (ret)
+ return ret;
+
+ if (!IS_ERR(sdhci_arasan->phy))
+ phy_power_off(sdhci_arasan->phy);
+
+ clk_disable_unprepare(sdhci_arasan->clk_ahb);
+ clk_disable_unprepare(pltfm_host->clk);
+
+ return 0;
+}
+
+static int sdhci_arasan_runtime_resume(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
+
+ clk_prepare_enable(pltfm_host->clk);
+ clk_prepare_enable(sdhci_arasan->clk_ahb);
+
+ if (!IS_ERR(sdhci_arasan->phy))
+ phy_power_on(sdhci_arasan->phy);
+
+ return sdhci_runtime_resume_host(host);
+}
+#else
+#define sdhci_arasan_runtime_suspend NULL
+#define sdhci_arasan_runtime_resume NULL
+#endif
+
#ifdef CONFIG_PM_SLEEP
/**
* sdhci_arasan_suspend - Suspend method for the driver
@@ -87,6 +129,12 @@ static int sdhci_arasan_suspend(struct device *dev)
struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
int ret;
+ ret = pm_runtime_force_suspend(dev);
+ if (ret) {
+ dev_err(dev, "problem force suspending\n");
+ return ret;
+ }
+
ret = sdhci_suspend_host(host);
if (ret)
return ret;
@@ -140,18 +188,39 @@ static int sdhci_arasan_resume(struct device *dev)
}
}
- return sdhci_resume_host(host);
+ ret = sdhci_resume_host(host);
+ if (ret)
+ goto err_resume_host;
+
+ ret = pm_runtime_force_resume(dev);
+ if (ret) {
+ dev_err(dev, "problem force resuming\n");
+ goto err_force_resume;
+ }
+
+ return 0;
+err_force_resume:
+ sdhci_suspend_host(host);
+err_resume_host:
+ if (!IS_ERR(sdhci_arasan->phy))
+ phy_power_off(sdhci_arasan->phy);
err_phy_power:
clk_disable_unprepare(pltfm_host->clk);
err_clk_en:
clk_disable_unprepare(sdhci_arasan->clk_ahb);
return ret;
}
+#else
+#define sdhci_arasan_suspend NULL
+#define sdhci_arasan_resume NULL
#endif /* ! CONFIG_PM_SLEEP */
-static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
- sdhci_arasan_resume);
+static const struct dev_pm_ops sdhci_arasan_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(sdhci_arasan_suspend, sdhci_arasan_resume)
+ SET_RUNTIME_PM_OPS(sdhci_arasan_runtime_suspend,
+ sdhci_arasan_runtime_resume, NULL)
+};
static int sdhci_arasan_probe(struct platform_device *pdev)
{
@@ -237,6 +306,12 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
}
}
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, ARASAN_RPM_DELAY_MS);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ pm_suspend_ignore_children(&pdev->dev, 1);
+
ret = sdhci_add_host(host);
if (ret)
goto err_pltfm_free;
@@ -244,6 +319,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
return 0;
err_pltfm_free:
+ pm_runtime_disable(&pdev->dev);
sdhci_pltfm_free(pdev);
err_phy_power:
if (!IS_ERR(sdhci_arasan->phy))
@@ -265,6 +341,9 @@ static int sdhci_arasan_remove(struct platform_device *pdev)
if (!IS_ERR(sdhci_arasan->phy))
phy_exit(sdhci_arasan->phy);
+ pm_runtime_get_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
clk_disable_unprepare(sdhci_arasan->clk_ahb);
return sdhci_pltfm_unregister(pdev);
--
2.3.7
--
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