From patchwork Mon May 9 00:55:12 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Horman X-Patchwork-Id: 768112 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter2.kernel.org (8.14.4/8.14.3) with ESMTP id p490ta28005082 for ; Mon, 9 May 2011 00:55:39 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756617Ab1EIAzi (ORCPT ); Sun, 8 May 2011 20:55:38 -0400 Received: from kirsty.vergenet.net ([202.4.237.240]:50157 "EHLO kirsty.vergenet.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756408Ab1EIAzf (ORCPT ); Sun, 8 May 2011 20:55:35 -0400 Received: from joe.akashicho.tokyo.vergenet.net (219-109-213-121.bitcat.net [219.109.213.121]) by kirsty.vergenet.net (Postfix) with ESMTP id C9E6D24067; Mon, 9 May 2011 10:55:30 +1000 (EST) Received: by joe.akashicho.tokyo.vergenet.net (Postfix, from userid 7100) id D35FF28A040; Mon, 9 May 2011 09:55:28 +0900 (JST) From: Simon Horman To: Guennadi Liakhovetski , Magnus Damm Cc: Ian Molton , Chris Ball , Paul Mundt , linux-sh@vger.kernel.org, linux-mmc@vger.kernel.org Subject: [PATCH 2/6] mmc: Add runtime and system-wide PM to the TMIO MMC driver Date: Mon, 9 May 2011 09:55:12 +0900 Message-Id: <1304902516-14150-3-git-send-email-horms@verge.net.au> X-Mailer: git-send-email 1.7.4.4 In-Reply-To: <1304902516-14150-1-git-send-email-horms@verge.net.au> References: <1304902516-14150-1-git-send-email-horms@verge.net.au> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Mon, 09 May 2011 00:55:39 +0000 (UTC) From: Guennadi Liakhovetski Add runtime and system-wide power management to the TMIO MMC driver in PIO and DMA modes, allowing it to properly save and restore its state during system suspend. Runtime PM is very crude ATM, because the controller has to be powered on all the time to detect card hotplug events. Signed-off-by: Guennadi Liakhovetski Reviewed-by: Simon Horman --- drivers/mmc/host/sh_mobile_sdhi.c | 6 ++++ drivers/mmc/host/tmio_mmc.c | 11 ++---- drivers/mmc/host/tmio_mmc.h | 10 ++++++ drivers/mmc/host/tmio_mmc_dma.c | 21 ++++++++------ drivers/mmc/host/tmio_mmc_pio.c | 57 +++++++++++++++++++++++++++++++++++-- 5 files changed, 86 insertions(+), 19 deletions(-) diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c index cc70123..f60e954 100644 --- a/drivers/mmc/host/sh_mobile_sdhi.c +++ b/drivers/mmc/host/sh_mobile_sdhi.c @@ -143,10 +143,16 @@ static int sh_mobile_sdhi_remove(struct platform_device *pdev) return 0; } +static const struct dev_pm_ops tmio_mmc_dev_pm_ops = { + .suspend = tmio_mmc_host_suspend, + .resume = tmio_mmc_host_resume, +}; + static struct platform_driver sh_mobile_sdhi_driver = { .driver = { .name = "sh_mobile_sdhi", .owner = THIS_MODULE, + .pm = &tmio_mmc_dev_pm_ops, }, .probe = sh_mobile_sdhi_probe, .remove = __devexit_p(sh_mobile_sdhi_remove), diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c index 79c5684..be739f7 100644 --- a/drivers/mmc/host/tmio_mmc.c +++ b/drivers/mmc/host/tmio_mmc.c @@ -30,7 +30,7 @@ static int tmio_mmc_suspend(struct platform_device *dev, pm_message_t state) struct mmc_host *mmc = platform_get_drvdata(dev); int ret; - ret = mmc_suspend_host(mmc); + ret = tmio_mmc_host_suspend(&dev->dev); /* Tell MFD core it can disable us now.*/ if (!ret && cell->disable) @@ -46,15 +46,12 @@ static int tmio_mmc_resume(struct platform_device *dev) int ret = 0; /* Tell the MFD core we are ready to be enabled */ - if (cell->resume) { + if (cell->resume) ret = cell->resume(dev); - if (ret) - goto out; - } - mmc_resume_host(mmc); + if (!ret) + ret = tmio_mmc_host_resume(&dev->dev); -out: return ret; } #else diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h index f353624..58138a2 100644 --- a/drivers/mmc/host/tmio_mmc.h +++ b/drivers/mmc/host/tmio_mmc.h @@ -52,6 +52,8 @@ struct tmio_mmc_host { void (*set_pwr)(struct platform_device *host, int state); void (*set_clk_div)(struct platform_device *host, int state); + int pm_error; + /* pio related stuff */ struct scatterlist *sg_ptr; struct scatterlist *sg_orig; @@ -121,4 +123,12 @@ static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host) } #endif +#ifdef CONFIG_PM +int tmio_mmc_host_suspend(struct device *dev); +int tmio_mmc_host_resume(struct device *dev); +#else +#define tmio_mmc_host_suspend NULL +#define tmio_mmc_host_resume NULL +#endif + #endif diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c index d3de74a..25f1ad6 100644 --- a/drivers/mmc/host/tmio_mmc_dma.c +++ b/drivers/mmc/host/tmio_mmc_dma.c @@ -256,7 +256,10 @@ static bool tmio_mmc_filter(struct dma_chan *chan, void *arg) void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata) { /* We can only either use DMA for both Tx and Rx or not use it at all */ - if (pdata->dma) { + if (!pdata->dma) + return; + + if (!host->chan_tx && !host->chan_rx) { dma_cap_mask_t mask; dma_cap_zero(mask); @@ -284,18 +287,18 @@ void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdat tasklet_init(&host->dma_complete, tmio_mmc_tasklet_fn, (unsigned long)host); tasklet_init(&host->dma_issue, tmio_mmc_issue_tasklet_fn, (unsigned long)host); + } - tmio_mmc_enable_dma(host, true); + tmio_mmc_enable_dma(host, true); + + return; - return; ebouncebuf: - dma_release_channel(host->chan_rx); - host->chan_rx = NULL; + dma_release_channel(host->chan_rx); + host->chan_rx = NULL; ereqrx: - dma_release_channel(host->chan_tx); - host->chan_tx = NULL; - return; - } + dma_release_channel(host->chan_tx); + host->chan_tx = NULL; } void tmio_mmc_release_dma(struct tmio_mmc_host *host) diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c index b4aef53..fb1d990 100644 --- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -39,6 +39,7 @@ #include #include #include +#include #include #include #include @@ -884,12 +885,17 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, else mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_resume(&pdev->dev); + if (ret < 0) + goto pm_disable; + tmio_mmc_clk_stop(_host); tmio_mmc_reset(_host); ret = platform_get_irq(pdev, 0); if (ret < 0) - goto unmap_ctl; + goto pm_suspend; _host->irq = ret; @@ -900,7 +906,7 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, ret = request_irq(_host->irq, tmio_mmc_irq, IRQF_DISABLED | IRQF_TRIGGER_FALLING, dev_name(&pdev->dev), _host); if (ret) - goto unmap_ctl; + goto pm_suspend; spin_lock_init(&_host->lock); @@ -910,6 +916,9 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, /* See if we also get DMA */ tmio_mmc_request_dma(_host, pdata); + /* We have to keep the device powered for its card detection to work */ + pm_runtime_get_noresume(&pdev->dev); + mmc_add_host(mmc); /* Unmask the IRQs we want to know about */ @@ -924,7 +933,10 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, return 0; -unmap_ctl: +pm_suspend: + pm_runtime_suspend(&pdev->dev); +pm_disable: + pm_runtime_disable(&pdev->dev); iounmap(_host->ctl); host_free: mmc_free_host(mmc); @@ -935,13 +947,52 @@ EXPORT_SYMBOL(tmio_mmc_host_probe); void tmio_mmc_host_remove(struct tmio_mmc_host *host) { + struct platform_device *pdev = host->pdev; + mmc_remove_host(host->mmc); cancel_delayed_work_sync(&host->delayed_reset_work); tmio_mmc_release_dma(host); free_irq(host->irq, host); iounmap(host->ctl); mmc_free_host(host->mmc); + + /* Compensate for pm_runtime_get_sync() in probe() above */ + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); } EXPORT_SYMBOL(tmio_mmc_host_remove); +#ifdef CONFIG_PM +int tmio_mmc_host_suspend(struct device *dev) +{ + struct mmc_host *mmc = dev_get_drvdata(dev); + struct tmio_mmc_host *host = mmc_priv(mmc); + int ret = mmc_suspend_host(mmc); + + if (!ret) + tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL); + + host->pm_error = pm_runtime_put_sync(dev); + + return ret; +} +EXPORT_SYMBOL(tmio_mmc_host_suspend); + +int tmio_mmc_host_resume(struct device *dev) +{ + struct mmc_host *mmc = dev_get_drvdata(dev); + struct tmio_mmc_host *host = mmc_priv(mmc); + + if (!host->pm_error) + pm_runtime_get_sync(dev); + + tmio_mmc_reset(mmc_priv(mmc)); + tmio_mmc_request_dma(host, host->pdata); + + return mmc_resume_host(mmc); +} +EXPORT_SYMBOL(tmio_mmc_host_resume); + +#endif /* CONFIG_PM */ + MODULE_LICENSE("GPL v2");