[RFC PATCH 1/1] mmc: dw_mmc: Add runtime pm to dw_mmc
From: Karol Wrona
Date: Wed Jan 21 2015 - 11:44:53 EST
This patch adds runtime pm handling to dw_mmc and enables it for dw_mmc-exynos.
It mainly uses mci_request/mci_request_end for mmc host state information.
Signed-off-by: Karol Wrona <k.wrona@xxxxxxxxxxx>
---
drivers/mmc/host/dw_mmc-exynos.c | 69 ++++++++++++++++++++++++++++++++++++--
drivers/mmc/host/dw_mmc.c | 65 +++++++++++++++++++++++++++++++++--
2 files changed, 130 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index 12a5eaa..7281c6f 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -17,12 +17,15 @@
#include <linux/mmc/mmc.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "dw_mmc.h"
#include "dw_mmc-pltfm.h"
#include "dw_mmc-exynos.h"
+#define DWMMC_AUTOSUSPEND_DELAY 200
+
/* Variations in Exynos specific dw-mshc controller */
enum dw_mci_exynos_type {
DW_MCI_TYPE_EXYNOS4210,
@@ -97,6 +100,30 @@ static int dw_mci_exynos_setup_clock(struct dw_mci *host)
return 0;
}
+#ifdef CONFIG_PM
+static int dw_mci_exynos_runtime_suspend(struct device *dev)
+{
+ struct dw_mci *host = dev_get_drvdata(dev);
+
+ /* empty for now */
+
+ return 0;
+}
+
+static int dw_mci_exynos_runtime_resume(struct device *dev)
+{
+ struct dw_mci *host = dev_get_drvdata(dev);
+
+ /* empty for now */
+
+ return 0;
+}
+#else
+#define dw_mci_exynos_runtime_suspend NULL
+#define dw_mci_exynos_runtime_resume NULL
+
+#endif /* CONFIG_PM */
+
#ifdef CONFIG_PM_SLEEP
static int dw_mci_exynos_suspend(struct device *dev)
{
@@ -179,6 +206,8 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
unsigned long actual;
u8 div = priv->ciu_div + 1;
+ pm_runtime_get_sync(host->dev);
+
if (ios->timing == MMC_TIMING_MMC_DDR52) {
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
@@ -196,6 +225,9 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
mci_writel(host, CLKSEL, priv->sdr_timing);
}
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+
/*
* Don't care if wanted clock is zero or
* ciu clock is unavailable
@@ -405,16 +437,49 @@ MODULE_DEVICE_TABLE(of, dw_mci_exynos_match);
static int dw_mci_exynos_probe(struct platform_device *pdev)
{
+ int ret;
const struct dw_mci_drv_data *drv_data;
const struct of_device_id *match;
match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node);
drv_data = match->data;
- return dw_mci_pltfm_register(pdev, drv_data);
+ ret = dw_mci_pltfm_register(pdev, drv_data);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "register error\n");
+ goto err_pm_dis;
+ }
+
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, DWMMC_AUTOSUSPEND_DELAY);
+ pm_runtime_use_autosuspend(&pdev->dev);
+
+ pm_runtime_mark_last_busy(&pdev->dev);
+ pm_runtime_put_autosuspend(&pdev->dev);
+
+ return ret;
+
+err_pm_dis:
+ pm_runtime_disable(&pdev->dev);
+ return ret;
}
+static int __exit dw_mci_exynos_remove(struct platform_device *pdev)
+{
+ pm_runtime_get_sync(&pdev->dev);
+
+ dw_mci_pltfm_remove(pdev);
+
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+
+}
static const struct dev_pm_ops dw_mci_exynos_pmops = {
SET_SYSTEM_SLEEP_PM_OPS(dw_mci_exynos_suspend, dw_mci_exynos_resume)
+ SET_RUNTIME_PM_OPS(dw_mci_exynos_runtime_suspend,
+ dw_mci_exynos_runtime_resume, NULL)
.resume_noirq = dw_mci_exynos_resume_noirq,
.thaw_noirq = dw_mci_exynos_resume_noirq,
.restore_noirq = dw_mci_exynos_resume_noirq,
@@ -422,7 +487,7 @@ static const struct dev_pm_ops dw_mci_exynos_pmops = {
static struct platform_driver dw_mci_exynos_pltfm_driver = {
.probe = dw_mci_exynos_probe,
- .remove = __exit_p(dw_mci_pltfm_remove),
+ .remove = __exit_p(dw_mci_exynos_remove),
.driver = {
.name = "dwmmc_exynos",
.of_match_table = dw_mci_exynos_match,
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 4d2e3c2..1e66d7b 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -38,6 +38,7 @@
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/mmc/slot-gpio.h>
+#include <linux/pm_runtime.h>
#include "dw_mmc.h"
@@ -112,6 +113,8 @@ static int dw_mci_req_show(struct seq_file *s, void *v)
struct mmc_command *stop;
struct mmc_data *data;
+ pm_runtime_get_sync(slot->host->dev);
+
/* Make sure we get a consistent snapshot */
spin_lock_bh(&slot->host->lock);
mrq = slot->mrq;
@@ -141,6 +144,9 @@ static int dw_mci_req_show(struct seq_file *s, void *v)
spin_unlock_bh(&slot->host->lock);
+ pm_runtime_mark_last_busy(slot->host->dev);
+ pm_runtime_put_autosuspend(slot->host->dev);
+
return 0;
}
@@ -1043,6 +1049,8 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
WARN_ON(slot->mrq);
+ pm_runtime_get_sync(host->dev);
+
/*
* The check for card presence and queueing of the request must be
* atomic, otherwise the card could be removed in between and the
@@ -1054,6 +1062,9 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
spin_unlock_bh(&host->lock);
mrq->cmd->error = -ENOMEDIUM;
mmc_request_done(mmc, mrq);
+
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
return;
}
@@ -1069,6 +1080,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
u32 regs;
int ret;
+ pm_runtime_get_sync(slot->host->dev);
+
switch (ios->bus_width) {
case MMC_BUS_WIDTH_4:
slot->ctype = SDMMC_CTYPE_4BIT;
@@ -1116,7 +1129,7 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
dev_err(slot->host->dev,
"failed to enable vmmc regulator\n");
/*return, if failed turn on vmmc*/
- return;
+ goto _end;
}
}
set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
@@ -1150,6 +1163,10 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
default:
break;
}
+
+_end:
+ pm_runtime_mark_last_busy(slot->host->dev);
+ pm_runtime_put_autosuspend(slot->host->dev);
}
static int dw_mci_card_busy(struct mmc_host *mmc)
@@ -1157,12 +1174,17 @@ static int dw_mci_card_busy(struct mmc_host *mmc)
struct dw_mci_slot *slot = mmc_priv(mmc);
u32 status;
+ pm_runtime_get_sync(slot->host->dev);
+
/*
* Check the busy bit which is low when DAT[3:0]
* (the data lines) are 0000
*/
status = mci_readl(slot->host, STATUS);
+ pm_runtime_mark_last_busy(slot->host->dev);
+ pm_runtime_put_autosuspend(slot->host->dev);
+
return !!(status & SDMMC_STATUS_BUSY);
}
@@ -1175,6 +1197,8 @@ static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
int min_uv, max_uv;
int ret;
+ pm_runtime_get_sync(host->dev);
+
/*
* Program the voltage. Note that some instances of dw_mmc may use
* the UHS_REG for this. For other instances (like exynos) the UHS_REG
@@ -1202,6 +1226,9 @@ static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
}
mci_writel(host, UHS_REG, uhs);
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+
return 0;
}
@@ -1211,6 +1238,8 @@ static int dw_mci_get_ro(struct mmc_host *mmc)
struct dw_mci_slot *slot = mmc_priv(mmc);
int gpio_ro = mmc_gpio_get_ro(mmc);
+ pm_runtime_get_sync(slot->host->dev);
+
/* Use platform get_ro function, else try on board write protect */
if ((slot->quirks & DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT) ||
(slot->host->quirks & DW_MCI_QUIRK_NO_WRITE_PROTECT))
@@ -1221,6 +1250,9 @@ static int dw_mci_get_ro(struct mmc_host *mmc)
read_only =
mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
+ pm_runtime_mark_last_busy(slot->host->dev);
+ pm_runtime_put_autosuspend(slot->host->dev);
+
dev_dbg(&mmc->class_dev, "card is %s\n",
read_only ? "read-only" : "read-write");
@@ -1235,6 +1267,8 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
struct dw_mci *host = slot->host;
int gpio_cd = mmc_gpio_get_cd(mmc);
+ pm_runtime_get_sync(host->dev);
+
/* Use platform get_cd function, else try onboard card detect */
if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
present = 1;
@@ -1254,6 +1288,9 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
}
spin_unlock_bh(&host->lock);
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+
return present;
}
@@ -1262,6 +1299,8 @@ static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
struct dw_mci_slot *slot = mmc_priv(mmc);
struct dw_mci *host = slot->host;
+ pm_runtime_get_sync(host->dev);
+
/*
* Low power mode will stop the card clock when idle. According to the
* description of the CLKENA register we should disable low power mode
@@ -1289,6 +1328,9 @@ static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
SDMMC_CMD_PRV_DAT_WAIT, 0);
}
}
+
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
}
static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
@@ -1298,6 +1340,9 @@ static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
unsigned long irqflags;
u32 int_mask;
+ if (enb)
+ pm_runtime_get_sync(slot->host->dev);
+
spin_lock_irqsave(&host->irq_lock, irqflags);
/* Enable/disable Slot Specific SDIO interrupt */
@@ -1309,6 +1354,12 @@ static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
mci_writel(host, INTMASK, int_mask);
spin_unlock_irqrestore(&host->irq_lock, irqflags);
+
+ /* If interrupt is enabled leave device active. */
+ if (!enb) {
+ pm_runtime_mark_last_busy(slot->host->dev);
+ pm_runtime_put_autosuspend(slot->host->dev);
+ }
}
static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
@@ -1318,8 +1369,14 @@ static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
const struct dw_mci_drv_data *drv_data = host->drv_data;
int err = -ENOSYS;
+ pm_runtime_get_sync(host->dev);
+
if (drv_data && drv_data->execute_tuning)
err = drv_data->execute_tuning(slot);
+
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+
return err;
}
@@ -1361,8 +1418,12 @@ static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
if (host->state == STATE_SENDING_CMD11)
host->state = STATE_WAITING_CMD11_DONE;
- else
+ else {
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+
host->state = STATE_IDLE;
+ }
}
spin_unlock(&host->lock);
--
1.7.9.5
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