mmc: mediatek: Add PM support for MMC driver
Add PM support for Mediatek MMC driver
Save/restore registers when PM
Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index fd965cb8..7153500 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -23,6 +23,8 @@
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/spinlock.h>
@@ -213,6 +215,7 @@
#define MSDC_ASYNC_FLAG (0x1 << 1)
#define MSDC_MMAP_FLAG (0x1 << 2)
+#define MTK_MMC_AUTOSUSPEND_DELAY 50
#define CMD_TIMEOUT (HZ/10 * 5) /* 100ms x5 */
#define DAT_TIMEOUT (HZ * 5) /* 1000ms x5 */
@@ -255,6 +258,15 @@
dma_addr_t bd_addr; /* the physical address of bd array */
};
+struct msdc_save_para {
+ u32 msdc_cfg;
+ u32 iocon;
+ u32 sdc_cfg;
+ u32 pad_tune;
+ u32 patch_bit0;
+ u32 patch_bit1;
+};
+
struct msdc_host {
struct device *dev;
struct mmc_host *mmc; /* mmc structure */
@@ -287,6 +299,7 @@
u32 sclk; /* SD/MS bus clock frequency */
bool ddr;
bool vqmmc_enabled;
+ struct msdc_save_para save_para; /* used when gate HCLK */
};
static void sdr_set_bits(void __iomem *reg, u32 bs)
@@ -678,6 +691,9 @@
if (mrq->data)
msdc_unprepare_data(host, mrq);
mmc_request_done(host->mmc, mrq);
+
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
}
/* returns true if command is fully handled; returns false otherwise */
@@ -832,6 +848,8 @@
WARN_ON(host->mrq);
host->mrq = mrq;
+ pm_runtime_get_sync(host->dev);
+
if (mrq->data)
msdc_prepare_data(host, mrq);
@@ -1146,6 +1164,8 @@
int ret;
u32 ddr = 0;
+ pm_runtime_get_sync(host->dev);
+
if (ios->timing == MMC_TIMING_UHS_DDR50 ||
ios->timing == MMC_TIMING_MMC_DDR52)
ddr = 1;
@@ -1160,7 +1180,7 @@
ios->vdd);
if (ret) {
dev_err(host->dev, "Failed to set vmmc power!\n");
- return;
+ goto end;
}
}
break;
@@ -1188,6 +1208,10 @@
if (host->mclk != ios->clock || host->ddr != ddr)
msdc_set_mclk(host, ddr, ios->clock);
+
+end:
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
}
static struct mmc_host_ops mt_msdc_ops = {
@@ -1311,12 +1335,18 @@
if (ret)
goto release;
+ pm_runtime_set_active(host->dev);
+ pm_runtime_set_autosuspend_delay(host->dev, MTK_MMC_AUTOSUSPEND_DELAY);
+ pm_runtime_use_autosuspend(host->dev);
+ pm_runtime_enable(host->dev);
ret = mmc_add_host(mmc);
+
if (ret)
- goto release;
+ goto end;
return 0;
-
+end:
+ pm_runtime_disable(host->dev);
release:
platform_set_drvdata(pdev, NULL);
msdc_deinit_hw(host);
@@ -1344,11 +1374,15 @@
mmc = platform_get_drvdata(pdev);
host = mmc_priv(mmc);
+ pm_runtime_get_sync(host->dev);
+
platform_set_drvdata(pdev, NULL);
mmc_remove_host(host->mmc);
msdc_deinit_hw(host);
msdc_gate_clock(host);
+ pm_runtime_disable(host->dev);
+ pm_runtime_put_noidle(host->dev);
dma_free_coherent(&pdev->dev,
sizeof(struct mt_gpdma_desc),
host->dma.gpd, host->dma.gpd_addr);
@@ -1360,6 +1394,54 @@
return 0;
}
+#ifdef CONFIG_PM
+static void msdc_save_reg(struct msdc_host *host)
+{
+ host->save_para.msdc_cfg = readl(host->base + MSDC_CFG);
+ host->save_para.iocon = readl(host->base + MSDC_IOCON);
+ host->save_para.sdc_cfg = readl(host->base + SDC_CFG);
+ host->save_para.pad_tune = readl(host->base + MSDC_PAD_TUNE);
+ host->save_para.patch_bit0 = readl(host->base + MSDC_PATCH_BIT);
+ host->save_para.patch_bit1 = readl(host->base + MSDC_PATCH_BIT1);
+}
+
+static void msdc_restore_reg(struct msdc_host *host)
+{
+ writel(host->save_para.msdc_cfg, host->base + MSDC_CFG);
+ writel(host->save_para.iocon, host->base + MSDC_IOCON);
+ writel(host->save_para.sdc_cfg, host->base + SDC_CFG);
+ writel(host->save_para.pad_tune, host->base + MSDC_PAD_TUNE);
+ writel(host->save_para.patch_bit0, host->base + MSDC_PATCH_BIT);
+ writel(host->save_para.patch_bit1, host->base + MSDC_PATCH_BIT1);
+}
+
+static int msdc_runtime_suspend(struct device *dev)
+{
+ struct mmc_host *mmc = dev_get_drvdata(dev);
+ struct msdc_host *host = mmc_priv(mmc);
+
+ msdc_save_reg(host);
+ msdc_gate_clock(host);
+ return 0;
+}
+
+static int msdc_runtime_resume(struct device *dev)
+{
+ struct mmc_host *mmc = dev_get_drvdata(dev);
+ struct msdc_host *host = mmc_priv(mmc);
+
+ msdc_ungate_clock(host);
+ msdc_restore_reg(host);
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops msdc_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(msdc_runtime_suspend, msdc_runtime_resume, NULL)
+};
+
static const struct of_device_id msdc_of_ids[] = {
{ .compatible = "mediatek,mt8135-mmc", },
{}
@@ -1371,6 +1453,7 @@
.driver = {
.name = "mtk-msdc",
.of_match_table = msdc_of_ids,
+ .pm = &msdc_dev_pm_ops,
},
};
