| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <1522302530-27550-1-git-send-email-naranimanish@gmail.com>
Date: Thu, 29 Mar 2018 11:18:50 +0530
From: <naranimanish@...il.com>
To: <adrian.hunter@...el.com>, <michal.simek@...inx.com>,
<ulf.hansson@...aro.org>, <linux-mmc@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: Manish Narani <mnarani@...inx.com>
Subject: [RFC PATCH] sdhci: arasan: Add runtime PM support
From: Manish Narani <mnarani@...inx.com>
This patch adds runtime PM support in Arasan SD driver.
Signed-off-by: Manish Narani <mnarani@...inx.com>
---
drivers/mmc/host/sdhci-of-arasan.c | 83 +++++++++++++++++++++++++++++++++++++-
1 file changed, 81 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index c33a5f7..47196b5 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -23,6 +23,7 @@
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include <linux/of.h>
@@ -349,6 +350,75 @@ static const struct sdhci_pltfm_data sdhci_arasan_cqe_pdata = {
SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
};
+#ifdef CONFIG_PM
+/**
+ * sdhci_arasan_runtime_suspend - Suspend method for the driver
+ * @dev: Address of the device structure
+ * Returns 0 on success and error value on error
+ *
+ * Put the device in a low power state.
+ */
+static int sdhci_arasan_runtime_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
+ int ret;
+
+ ret = sdhci_runtime_suspend_host(host);
+ if (ret)
+ return ret;
+
+ if (host->tuning_mode != SDHCI_TUNING_MODE_3)
+ mmc_retune_needed(host->mmc);
+
+ clk_disable(pltfm_host->clk);
+ clk_disable(sdhci_arasan->clk_ahb);
+
+ return 0;
+}
+
+/**
+ * sdhci_arasan_runtime_resume - Resume method for the driver
+ * @dev: Address of the device structure
+ * Returns 0 on success and error value on error
+ *
+ * Resume operation after suspend
+ */
+static int sdhci_arasan_runtime_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
+ int ret;
+
+ ret = clk_enable(sdhci_arasan->clk_ahb);
+ if (ret) {
+ dev_err(dev, "Cannot enable AHB clock.\n");
+ return ret;
+ }
+
+ ret = clk_enable(pltfm_host->clk);
+ if (ret) {
+ dev_err(dev, "Cannot enable SD clock.\n");
+ return ret;
+ }
+
+ ret = sdhci_runtime_resume_host(host);
+ if (ret)
+ goto out;
+
+ return 0;
+out:
+ clk_disable(pltfm_host->clk);
+ clk_disable(sdhci_arasan->clk_ahb);
+
+ return ret;
+}
+#endif /* ! CONFIG_PM */
+
#ifdef CONFIG_PM_SLEEP
/**
* sdhci_arasan_suspend - Suspend method for the driver
@@ -443,8 +513,11 @@ static int sdhci_arasan_resume(struct device *dev)
}
#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 const struct of_device_id sdhci_arasan_of_match[] = {
/* SoC-specific compatible strings w/ soc_ctl_map */
@@ -806,6 +879,12 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
if (ret)
goto err_add_host;
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
+ pm_runtime_mark_last_busy(&pdev->dev);
+ pm_runtime_use_autosuspend(&pdev->dev);
+
return 0;
err_add_host:
--
2.7.4
Powered by blists - more mailing lists