linux-kernel - [PATCH 2/2] davinci: MMC: updates to suspend/resume implementation

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Date:	Thu, 17 Dec 2009 17:45:01 +0530
From:	Chaithrika U S <chaithrika@...com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	khilman@...prootsystems.com, Chaithrika U S <chaithrika@...com>
Subject: [PATCH 2/2] davinci: MMC: updates to suspend/resume implementation

Improve the suspend and resume callbacks in DaVinci MMC
host controller driver.

Tested on DA850/OMAP-L138 EVM. This testing requires patches
which add suspend-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 <chaithrika@...com>
---
Applies to Linus' kernel tree.

 drivers/mmc/host/davinci_mmc.c |   31 +++++++++++++++++++++++++++++--
 1 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 25645bf..7d05cc1 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
@@ -1300,15 +1301,41 @@ static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
 static int davinci_mmcsd_suspend(struct platform_device *pdev, pm_message_t msg)
 {
 	struct mmc_davinci_host *host = platform_get_drvdata(pdev);
+	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)
 {
 	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;
 }
 #else
 #define davinci_mmcsd_suspend	NULL
-- 
1.5.6

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