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mmc: sdhci-msm: Add pm_runtime and system PM support

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Provides runtime PM callbacks to enable and disable clock resources
when idle. Also support system PM callbacks to be called during system
suspend and resume.

Reviewed-by: Ritesh Harjani <riteshh@codeaurora.org>
Reviewed-by: Georgi Djakov <georgi.djakov@linaro.org>
Tested-by: Ritesh Harjani <riteshh@codeaurora.org>
Signed-off-by: Pramod Gurav <pramod.gurav@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Pramod Gurav 2016-10-21 12:12:04 +05:30 committed by Ulf Hansson
parent 424feb59d8
commit 67e6db113c
1 changed files with 67 additions and 1 deletions
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68
drivers/mmc/host/sdhci-msm.c
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@ -18,6 +18,7 @@
#include <linux/of_device.h>
#include <linux/delay.h>
#include <linux/mmc/mmc.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "sdhci-pltfm.h"
@ -68,6 +69,7 @@
#define CMUX_SHIFT_PHASE_SHIFT 24
#define CMUX_SHIFT_PHASE_MASK (7 << CMUX_SHIFT_PHASE_SHIFT)
#define MSM_MMC_AUTOSUSPEND_DELAY_MS 50
struct sdhci_msm_host {
struct platform_device *pdev;
void __iomem *core_mem; /* MSM SDCC mapped address */
@ -659,12 +661,26 @@ static int sdhci_msm_probe(struct platform_device *pdev)
goto clk_disable;
}
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev,
MSM_MMC_AUTOSUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&pdev->dev);
ret = sdhci_add_host(host);
if (ret)
goto clk_disable;
goto pm_runtime_disable;
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
return 0;
pm_runtime_disable:
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
clk_disable:
clk_disable_unprepare(msm_host->clk);
pclk_disable:
@ -686,6 +702,11 @@ static int sdhci_msm_remove(struct platform_device *pdev)
0xffffffff);
sdhci_remove_host(host, dead);
pm_runtime_get_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
clk_disable_unprepare(msm_host->clk);
clk_disable_unprepare(msm_host->pclk);
if (!IS_ERR(msm_host->bus_clk))
@ -694,12 +715,57 @@ static int sdhci_msm_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int sdhci_msm_runtime_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
clk_disable_unprepare(msm_host->clk);
clk_disable_unprepare(msm_host->pclk);
return 0;
}
static int sdhci_msm_runtime_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
int ret;
ret = clk_prepare_enable(msm_host->clk);
if (ret) {
dev_err(dev, "clk_enable failed for core_clk: %d\n", ret);
return ret;
}
ret = clk_prepare_enable(msm_host->pclk);
if (ret) {
dev_err(dev, "clk_enable failed for iface_clk: %d\n", ret);
clk_disable_unprepare(msm_host->clk);
return ret;
}
return 0;
}
#endif
static const struct dev_pm_ops sdhci_msm_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(sdhci_msm_runtime_suspend,
sdhci_msm_runtime_resume,
NULL)
};
static struct platform_driver sdhci_msm_driver = {
.probe = sdhci_msm_probe,
.remove = sdhci_msm_remove,
.driver = {
.name = "sdhci_msm",
.of_match_table = sdhci_msm_dt_match,
.pm = &sdhci_msm_pm_ops,
},
};