openwrtv4/target/linux/s3c24xx/patches-2.6.24/1092-fix-glamo-mci-defeat-ops-during-suspend.patch.patch

From 99fbe6e31e09c9000668b50a87b3bbb834a145d0 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Sun, 13 Apr 2008 07:25:50 +0100
Subject: [PATCH] fix-glamo-mci-defeat-ops-during-suspend.patch

We need to be able to use the config option CONFIG_MMC_UNSAFE_RESUME that allows the rootfs
to live on SD.  But when we use this, it tries to send a reset command to the SD card during
suspend -- and unfortunately many things like Power have suspended by then.

This patch again rejects IO on the MMC device during suspend of the MMC device, and it
gives the result the rootfs on SD card works okay.

Signed-off-by: Andy Green <andy@openmoko.com>
---
 drivers/mfd/glamo/glamo-mci.c |   14 ++++++++++++++
 drivers/mfd/glamo/glamo-mci.h |    2 ++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
index f559e5e..bbbbe4d 100644
--- a/drivers/mfd/glamo/glamo-mci.c
+++ b/drivers/mfd/glamo/glamo-mci.c
@@ -406,6 +406,14 @@ static void glamo_mci_send_request(struct mmc_host *mmc)
 	u16 status;
 	int n;
 
+	if (host->suspending) {
+		cmd->error = -EIO;
+		if (cmd->data)
+			cmd->data->error = -EIO;
+		mmc_request_done(mmc, mrq);
+		return;
+	}
+
 	host->ccnt++;
 	/*
 	 * somehow 2.6.24 MCI manages to issue MMC_WRITE_BLOCK *without* the
@@ -792,6 +800,9 @@ static int glamo_mci_remove(struct platform_device *pdev)
 static int glamo_mci_suspend(struct platform_device *dev, pm_message_t state)
 {
 	struct mmc_host *mmc = platform_get_drvdata(dev);
+	struct glamo_mci_host 	*host = mmc_priv(mmc);
+
+	host->suspending++;
 
 	return  mmc_suspend_host(mmc, state);
 }
@@ -799,6 +810,9 @@ static int glamo_mci_suspend(struct platform_device *dev, pm_message_t state)
 static int glamo_mci_resume(struct platform_device *dev)
 {
 	struct mmc_host *mmc = platform_get_drvdata(dev);
+	struct glamo_mci_host 	*host = mmc_priv(mmc);
+
+	host->suspending--;
 
 	return mmc_resume_host(mmc);
 }
diff --git a/drivers/mfd/glamo/glamo-mci.h b/drivers/mfd/glamo/glamo-mci.h
index 40c3e24..55852e7 100644
--- a/drivers/mfd/glamo/glamo-mci.h
+++ b/drivers/mfd/glamo/glamo-mci.h
@@ -34,6 +34,8 @@ struct glamo_mci_host {
 	int			dma;
 	int 			data_max_size;
 
+	int 			suspending;
+
 	int			power_mode_current;
 	unsigned int		vdd_current;
 
-- 
1.5.6.5