[PATCH v2 1/1] mmc: dw_mmc: Add runtime pm to dw_mmc

Karol Wrona
2015-03-06T13:29:57Z

This patch adds runtime pm handling to dw_mmc.
It mainly uses mci_request/mci_request_end for mmc host state information.
The goal of the runtime pm in dw_mmc host is mainly for giving an information
for containing it power domain about its activity.

Signed-off-by: Karol Wrona <k.wrona@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
---
drivers/mmc/host/dw_mmc.c | 99 ++++++++++++++++++++++++++++++++++++++++++---
drivers/mmc/host/dw_mmc.h | 2 +
2 files changed, 95 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 4d2e3c2..ad8b71e 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;
}

@@ -1081,6 +1092,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
slot->ctype = SDMMC_CTYPE_1BIT;
}

+ pm_runtime_get_sync(slot->host->dev);
+
regs = mci_readl(slot->host, UHS_REG);

/* DDR mode set */
@@ -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
@@ -1197,11 +1221,17 @@ static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
dev_dbg(&mmc->class_dev,
"Regulator set error %d: %d - %d\n",
ret, min_uv, max_uv);
+
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
return ret;
}
}
mci_writel(host, UHS_REG, uhs);

+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+
return 0;
}

@@ -1211,6 +1241,8 @@ 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 +1253,9 @@ 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 +1270,8 @@ 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 +1291,9 @@ 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 +1302,8 @@ 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 +1331,9 @@ 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 +1343,9 @@ 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 +1357,12 @@ 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 +1372,14 @@ 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;
}

@@ -1359,10 +1419,14 @@ static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
} else {
dev_vdbg(host->dev, "list empty\n");

- if (host->state == STATE_SENDING_CMD11)
+ 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);
@@ -2595,6 +2659,11 @@ int dw_mci_probe(struct dw_mci *host)
return -ENODEV;
}

+ pm_runtime_enable(host->dev);
+ pm_runtime_get_sync(host->dev);
+ pm_runtime_set_autosuspend_delay(host->dev, DWMMC_AUTOSUSPEND_DELAY);
+ pm_runtime_use_autosuspend(host->dev);
+
host->biu_clk = devm_clk_get(host->dev, "biu");
if (IS_ERR(host->biu_clk)) {
dev_dbg(host->dev, "biu clock not available\n");
@@ -2781,6 +2850,9 @@ int dw_mci_probe(struct dw_mci *host)
if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");

+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+
return 0;

err_dmaunmap:
@@ -2795,6 +2867,9 @@ err_clk_biu:
if (!IS_ERR(host->biu_clk))
clk_disable_unprepare(host->biu_clk);

+ pm_runtime_put_sync(host->dev);
+ pm_runtime_disable(host->dev);
+
return ret;
}
EXPORT_SYMBOL(dw_mci_probe);
@@ -2803,6 +2878,8 @@ void dw_mci_remove(struct dw_mci *host)
{
int i;

+ pm_runtime_get_sync(host->dev);
+
mci_writel(host, RINTSTS, 0xFFFFFFFF);
mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */

@@ -2819,6 +2896,9 @@ void dw_mci_remove(struct dw_mci *host)
if (host->use_dma && host->dma_ops->exit)
host->dma_ops->exit(host);

+ pm_runtime_put_sync(host->dev);
+ pm_runtime_disable(host->dev);
+
if (!IS_ERR(host->ciu_clk))
clk_disable_unprepare(host->ciu_clk);

@@ -2841,11 +2921,14 @@ EXPORT_SYMBOL(dw_mci_suspend);

int dw_mci_resume(struct dw_mci *host)
{
- int i, ret;
+ int i;
+
+ pm_runtime_get_sync(host->dev);

if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
- ret = -ENODEV;
- return ret;
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+ return -ENODEV;
}

if (host->use_dma && host->dma_ops->init)
@@ -2876,6 +2959,10 @@ int dw_mci_resume(struct dw_mci *host)
dw_mci_setup_bus(slot, true);
}
}
+
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+
return 0;
}
EXPORT_SYMBOL(dw_mci_resume);
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index 18c4afe..6a364f4f 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -209,6 +209,8 @@ extern int dw_mci_suspend(struct dw_mci *host);
extern int dw_mci_resume(struct dw_mci *host);
#endif

+#define DWMMC_AUTOSUSPEND_DELAY 50
+
/**
* struct dw_mci_slot - MMC slot state
* @mmc: The mmc_host representing this slot.
--
1.7.9.5