Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753343Ab0AHMFw (ORCPT ); Fri, 8 Jan 2010 07:05:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753311Ab0AHMFv (ORCPT ); Fri, 8 Jan 2010 07:05:51 -0500 Received: from devils.ext.ti.com ([198.47.26.153]:45431 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753301Ab0AHMFu (ORCPT ); Fri, 8 Jan 2010 07:05:50 -0500 From: Chaithrika U S To: linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, davinci-linux-open-source@linux.davincidsp.com, khilman@deeprootsystems.com, Chaithrika U S Subject: [PATCH v3 2/2] davinci: MMC: updates to suspend/resume implementation Date: Fri, 8 Jan 2010 17:09:00 +0530 Message-Id: <1262950740-12625-1-git-send-email-chaithrika@ti.com> X-Mailer: git-send-email 1.5.6 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3454 Lines: 114 Improve the suspend and resume callbacks in DaVinci MMC host controller driver. Modify the reset status of the contorller and clock during suspend and resume. Also migrate the power management callbacks from platform driver to dev_pm_ops structure. Tested on DA850/OMAP-L138 EVM. This testing requires patches which add suspen-to-RAM support to DA850/OMAP-L138 SoC[1]. [1]http://linux.davincidsp.com/pipermail/davinci-linux-open-source/ 2009-September/016118.html Signed-off-by: Chaithrika U S --- Applies to Linus' kernel tree. Since the previous version, patch description has been updated. drivers/mmc/host/davinci_mmc.c | 51 +++++++++++++++++++++++++++++++++------ 1 files changed, 43 insertions(+), 8 deletions(-) diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c index 25645bf..d60f648 100644 --- a/drivers/mmc/host/davinci_mmc.c +++ b/drivers/mmc/host/davinci_mmc.c @@ -170,6 +170,7 @@ struct mmc_davinci_host { #define DAVINCI_MMC_DATADIR_READ 1 #define DAVINCI_MMC_DATADIR_WRITE 2 unsigned char data_dir; + unsigned char suspended; /* buffer is used during PIO of one scatterlist segment, and * is updated along with buffer_bytes_left. bytes_left applies @@ -1297,32 +1298,66 @@ static int __exit davinci_mmcsd_remove(struct platform_device *pdev) } #ifdef CONFIG_PM -static int davinci_mmcsd_suspend(struct platform_device *pdev, pm_message_t msg) +static int davinci_mmcsd_suspend(struct device *dev) { + struct platform_device *pdev = to_platform_device(dev); struct mmc_davinci_host *host = platform_get_drvdata(pdev); + struct pm_message msg = { PM_EVENT_SUSPEND }; + int ret; - return mmc_suspend_host(host->mmc, msg); + mmc_host_enable(host->mmc); + ret = mmc_suspend_host(host->mmc, msg); + if (!ret) { + writel(0, host->base + DAVINCI_MMCIM); + mmc_davinci_reset_ctrl(host, 1); + mmc_host_disable(host->mmc); + clk_disable(host->clk); + host->suspended = 1; + } else { + host->suspended = 0; + mmc_host_disable(host->mmc); + } + + return ret; } -static int davinci_mmcsd_resume(struct platform_device *pdev) +static int davinci_mmcsd_resume(struct device *dev) { + struct platform_device *pdev = to_platform_device(dev); struct mmc_davinci_host *host = platform_get_drvdata(pdev); + int ret; - return mmc_resume_host(host->mmc); + if (!host->suspended) + return 0; + + clk_enable(host->clk); + mmc_host_enable(host->mmc); + + mmc_davinci_reset_ctrl(host, 0); + ret = mmc_resume_host(host->mmc); + if (!ret) + host->suspended = 0; + + return ret; } + +static struct dev_pm_ops davinci_mmcsd_pm = { + .suspend = davinci_mmcsd_suspend, + .resume = davinci_mmcsd_resume, +}; + +#define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm) #else -#define davinci_mmcsd_suspend NULL -#define davinci_mmcsd_resume NULL +#define davinci_mmcsd_pm_ops NULL #endif static struct platform_driver davinci_mmcsd_driver = { .driver = { .name = "davinci_mmc", .owner = THIS_MODULE, + .pm = davinci_mmcsd_pm_ops, }, .remove = __exit_p(davinci_mmcsd_remove), - .suspend = davinci_mmcsd_suspend, - .resume = davinci_mmcsd_resume, }; static int __init davinci_mmcsd_init(void) -- 1.5.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/