This patch uses runtime PM to allow the system to power down the MMC controller, when the MMC closk is switched off. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx> --- v3: updated on top of current mmc-next plus my earlier patch "mmc: tmio: fix recursive spinlock, don't schedule with interrupts disabled" v2: Primarily tested on mackerel, with runtime PM and system-wide suspend, updated to the current core and sh-mobile runtime PM code. To avoid regression should go in after "ARM: mach-shmobile: use GPIO interrupt also for card eject on SDHI0 on mackerel": http://article.gmane.org/gmane.linux.kernel.mmc/9230 drivers/mmc/host/tmio_mmc.h | 2 + drivers/mmc/host/tmio_mmc_pio.c | 64 ++++++++++++++++++++++---------------- 2 files changed, 39 insertions(+), 27 deletions(-) diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h index a2d6f9f..551d1ef 100644 --- a/drivers/mmc/host/tmio_mmc.h +++ b/drivers/mmc/host/tmio_mmc.h @@ -53,6 +53,8 @@ struct tmio_mmc_host { void (*set_clk_div)(struct platform_device *host, int state); int pm_error; + /* recognise system-wide suspend in runtime PM methods */ + bool pm_global; /* pio related stuff */ struct scatterlist *sg_ptr; diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c index a2f76ad..221ffb7 100644 --- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -546,6 +546,7 @@ out: irqreturn_t tmio_mmc_irq(int irq, void *devid) { struct tmio_mmc_host *host = devid; + struct mmc_host *mmc = host->mmc; struct tmio_mmc_data *pdata = host->pdata; unsigned int ireg, irq_mask, status; unsigned int sdio_ireg, sdio_irq_mask, sdio_status; @@ -567,13 +568,13 @@ irqreturn_t tmio_mmc_irq(int irq, void *devid) if (sdio_ireg && !host->sdio_irq_enabled) { pr_warning("tmio_mmc: Spurious SDIO IRQ, disabling! 0x%04x 0x%04x 0x%04x\n", sdio_status, sdio_irq_mask, sdio_ireg); - tmio_mmc_enable_sdio_irq(host->mmc, 0); + tmio_mmc_enable_sdio_irq(mmc, 0); goto out; } - if (host->mmc->caps & MMC_CAP_SDIO_IRQ && + if (mmc->caps & MMC_CAP_SDIO_IRQ && sdio_ireg & TMIO_SDIO_STAT_IOIRQ) - mmc_signal_sdio_irq(host->mmc); + mmc_signal_sdio_irq(mmc); if (sdio_ireg) goto out; @@ -586,7 +587,9 @@ irqreturn_t tmio_mmc_irq(int irq, void *devid) if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) { tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE); - if (!work_pending(&host->mmc->detect.work)) + if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) || + ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) && + !work_pending(&mmc->detect.work)) mmc_detect_change(host->mmc, msecs_to_jiffies(100)); goto out; } @@ -743,33 +746,30 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) spin_unlock_irqrestore(&host->lock, flags); - if (ios->clock) - tmio_mmc_set_clock(host, ios->clock); - - /* Power sequence - OFF -> UP -> ON */ - if (ios->power_mode == MMC_POWER_UP) { - if ((pdata->flags & TMIO_MMC_HAS_COLD_CD) && !pdata->power) { + /* + * pdata->power == false only if COLD_CD is available, otherwise only + * in short time intervals during probing or resuming + */ + if (ios->power_mode == MMC_POWER_ON && ios->clock) { + if (!pdata->power) { pm_runtime_get_sync(&host->pdev->dev); pdata->power = true; } + tmio_mmc_set_clock(host, ios->clock); /* power up SD bus */ if (host->set_pwr) host->set_pwr(host->pdev, 1); - } else if (ios->power_mode == MMC_POWER_OFF || !ios->clock) { - /* power down SD bus */ - if (ios->power_mode == MMC_POWER_OFF) { - if (host->set_pwr) - host->set_pwr(host->pdev, 0); - if ((pdata->flags & TMIO_MMC_HAS_COLD_CD) && - pdata->power) { - pdata->power = false; - pm_runtime_put(&host->pdev->dev); - } - } - tmio_mmc_clk_stop(host); - } else { /* start bus clock */ tmio_mmc_clk_start(host); + } else if (ios->power_mode != MMC_POWER_UP) { + if (host->set_pwr) + host->set_pwr(host->pdev, 0); + if ((pdata->flags & TMIO_MMC_HAS_COLD_CD) && + pdata->power) { + pdata->power = false; + pm_runtime_put(&host->pdev->dev); + } + tmio_mmc_clk_stop(host); } switch (ios->bus_width) { @@ -897,8 +897,10 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, tmio_mmc_request_dma(_host, pdata); /* We have to keep the device powered for its card detection to work */ - if (!(pdata->flags & TMIO_MMC_HAS_COLD_CD)) + if (!(pdata->flags & TMIO_MMC_HAS_COLD_CD)) { + pdata->power = true; pm_runtime_get_noresume(&pdev->dev); + } mmc_add_host(mmc); @@ -975,11 +977,16 @@ int tmio_mmc_host_resume(struct device *dev) /* The MMC core will perform the complete set up */ host->pdata->power = false; + host->pm_global = true; if (!host->pm_error) pm_runtime_get_sync(dev); - tmio_mmc_reset(mmc_priv(mmc)); - tmio_mmc_request_dma(host, host->pdata); + if (host->pm_global) { + /* Runtime PM resume callback didn't run */ + tmio_mmc_reset(host); + tmio_mmc_request_dma(host, host->pdata); + host->pm_global = false; + } return mmc_resume_host(mmc); } @@ -1000,12 +1007,15 @@ int tmio_mmc_host_runtime_resume(struct device *dev) struct tmio_mmc_data *pdata = host->pdata; tmio_mmc_reset(host); + tmio_mmc_request_dma(host, host->pdata); if (pdata->power) { /* Only entered after a card-insert interrupt */ - tmio_mmc_set_ios(mmc, &mmc->ios); + if (!mmc->card) + tmio_mmc_set_ios(mmc, &mmc->ios); mmc_detect_change(mmc, msecs_to_jiffies(100)); } + host->pm_global = false; return 0; } -- 1.7.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
