From 4ca0e8a959569852b520b607d39ce6ceeeb0f518 Mon Sep 17 00:00:00 2001 From: Chaotian Jing Date: Mon, 15 Jun 2015 19:20:49 +0800 Subject: [PATCH 36/76] 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 --- drivers/mmc/host/mtk-sd.c | 89 +++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 86 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c index 952be2e..7c20f28 100644 --- a/drivers/mmc/host/mtk-sd.c +++ b/drivers/mmc/host/mtk-sd.c @@ -22,6 +22,8 @@ #include #include #include +#include +#include #include #include @@ -212,6 +214,7 @@ #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 */ @@ -254,6 +257,15 @@ struct msdc_dma { 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 */ @@ -286,6 +298,7 @@ struct msdc_host { 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) @@ -677,6 +690,9 @@ static void msdc_request_done(struct msdc_host *host, struct mmc_request *mrq) 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 */ @@ -831,6 +847,8 @@ static void msdc_ops_request(struct mmc_host *mmc, struct mmc_request *mrq) WARN_ON(host->mrq); host->mrq = mrq; + pm_runtime_get_sync(host->dev); + if (mrq->data) msdc_prepare_data(host, mrq); @@ -1145,6 +1163,8 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 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; @@ -1159,7 +1179,7 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) ios->vdd); if (ret) { dev_err(host->dev, "Failed to set vmmc power!\n"); - return; + goto end; } } break; @@ -1187,6 +1207,10 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 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 = { @@ -1310,12 +1334,18 @@ static int msdc_drv_probe(struct platform_device *pdev) 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); @@ -1343,11 +1373,15 @@ static int msdc_drv_remove(struct platform_device *pdev) 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); @@ -1359,6 +1393,54 @@ static int msdc_drv_remove(struct platform_device *pdev) 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", }, {} @@ -1370,6 +1452,7 @@ static struct platform_driver mt_msdc_driver = { .driver = { .name = "mtk-msdc", .of_match_table = msdc_of_ids, + .pm = &msdc_dev_pm_ops, }, }; -- 1.7.10.4