11 files changed, 461 insertions, 36 deletions

diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index 19a1a254a0c5..889e5f898f6f 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -12,3 +12,4 @@ mmc_core-y			:= core.o bus.o host.o \
                                    sdio.o sdio_ops.o sdio_bus.o \
                                    sdio_cis.o sdio_io.o sdio_irq.o
 
+mmc_core-$(CONFIG_DEBUG_FS)     += debugfs.o
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index fd95b18e988b..0d9b2d6f9ebf 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -252,6 +252,10 @@ int mmc_add_card(struct mmc_card *card)
         if (ret)
                 return ret;
 
+#ifdef CONFIG_DEBUG_FS
+        mmc_add_card_debugfs(card);
+#endif
+
         mmc_card_set_present(card);
 
         return 0;
@@ -263,6 +267,10 @@ int mmc_add_card(struct mmc_card *card)
  */
 void mmc_remove_card(struct mmc_card *card)
 {
+#ifdef CONFIG_DEBUG_FS
+        mmc_remove_card_debugfs(card);
+#endif
+
         if (mmc_card_present(card)) {
                 if (mmc_host_is_spi(card->host)) {
                         printk(KERN_INFO "%s: SPI card removed\n",
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index cdb332b7dedc..c819effa1032 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -52,5 +52,12 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr);
 
 extern int use_spi_crc;
 
+/* Debugfs information for hosts and cards */
+void mmc_add_host_debugfs(struct mmc_host *host);
+void mmc_remove_host_debugfs(struct mmc_host *host);
+
+void mmc_add_card_debugfs(struct mmc_card *card);
+void mmc_remove_card_debugfs(struct mmc_card *card);
+
 #endif
 
diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
new file mode 100644
index 000000000000..1237bb4c722b
--- /dev/null
+++ b/drivers/mmc/core/debugfs.c
@@ -0,0 +1,225 @@
+/*
+ * Debugfs support for hosts and cards
+ *
+ * Copyright (C) 2008 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+
+#include "core.h"
+#include "mmc_ops.h"
+
+/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
+static int mmc_ios_show(struct seq_file *s, void *data)
+{
+        static const char *vdd_str[] = {
+                [8]     = "2.0",
+                [9]     = "2.1",
+                [10]    = "2.2",
+                [11]    = "2.3",
+                [12]    = "2.4",
+                [13]    = "2.5",
+                [14]    = "2.6",
+                [15]    = "2.7",
+                [16]    = "2.8",
+                [17]    = "2.9",
+                [18]    = "3.0",
+                [19]    = "3.1",
+                [20]    = "3.2",
+                [21]    = "3.3",
+                [22]    = "3.4",
+                [23]    = "3.5",
+                [24]    = "3.6",
+        };
+        struct mmc_host *host = s->private;
+        struct mmc_ios  *ios = &host->ios;
+        const char *str;
+
+        seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
+        seq_printf(s, "vdd:\t\t%u ", ios->vdd);
+        if ((1 << ios->vdd) & MMC_VDD_165_195)
+                seq_printf(s, "(1.65 - 1.95 V)\n");
+        else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
+                        && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
+                seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
+                                vdd_str[ios->vdd + 1]);
+        else
+                seq_printf(s, "(invalid)\n");
+
+        switch (ios->bus_mode) {
+        case MMC_BUSMODE_OPENDRAIN:
+                str = "open drain";
+                break;
+        case MMC_BUSMODE_PUSHPULL:
+                str = "push-pull";
+                break;
+        default:
+                str = "invalid";
+                break;
+        }
+        seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
+
+        switch (ios->chip_select) {
+        case MMC_CS_DONTCARE:
+                str = "don't care";
+                break;
+        case MMC_CS_HIGH:
+                str = "active high";
+                break;
+        case MMC_CS_LOW:
+                str = "active low";
+                break;
+        default:
+                str = "invalid";
+                break;
+        }
+        seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
+
+        switch (ios->power_mode) {
+        case MMC_POWER_OFF:
+                str = "off";
+                break;
+        case MMC_POWER_UP:
+                str = "up";
+                break;
+        case MMC_POWER_ON:
+                str = "on";
+                break;
+        default:
+                str = "invalid";
+                break;
+        }
+        seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
+        seq_printf(s, "bus width:\t%u (%u bits)\n",
+                        ios->bus_width, 1 << ios->bus_width);
+
+        switch (ios->timing) {
+        case MMC_TIMING_LEGACY:
+                str = "legacy";
+                break;
+        case MMC_TIMING_MMC_HS:
+                str = "mmc high-speed";
+                break;
+        case MMC_TIMING_SD_HS:
+                str = "sd high-speed";
+                break;
+        default:
+                str = "invalid";
+                break;
+        }
+        seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
+
+        return 0;
+}
+
+static int mmc_ios_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, mmc_ios_show, inode->i_private);
+}
+
+static const struct file_operations mmc_ios_fops = {
+        .open           = mmc_ios_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+void mmc_add_host_debugfs(struct mmc_host *host)
+{
+        struct dentry *root;
+
+        root = debugfs_create_dir(mmc_hostname(host), NULL);
+        if (IS_ERR(root))
+                /* Don't complain -- debugfs just isn't enabled */
+                return;
+        if (!root)
+                /* Complain -- debugfs is enabled, but it failed to
+                 * create the directory. */
+                goto err_root;
+
+        host->debugfs_root = root;
+
+        if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
+                goto err_ios;
+
+        return;
+
+err_ios:
+        debugfs_remove_recursive(root);
+        host->debugfs_root = NULL;
+err_root:
+        dev_err(&host->class_dev, "failed to initialize debugfs\n");
+}
+
+void mmc_remove_host_debugfs(struct mmc_host *host)
+{
+        debugfs_remove_recursive(host->debugfs_root);
+}
+
+static int mmc_dbg_card_status_get(void *data, u64 *val)
+{
+        struct mmc_card *card = data;
+        u32             status;
+        int             ret;
+
+        mmc_claim_host(card->host);
+
+        ret = mmc_send_status(data, &status);
+        if (!ret)
+                *val = status;
+
+        mmc_release_host(card->host);
+
+        return ret;
+}
+DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
+                NULL, "%08llx\n");
+
+void mmc_add_card_debugfs(struct mmc_card *card)
+{
+        struct mmc_host *host = card->host;
+        struct dentry   *root;
+
+        if (!host->debugfs_root)
+                return;
+
+        root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
+        if (IS_ERR(root))
+                /* Don't complain -- debugfs just isn't enabled */
+                return;
+        if (!root)
+                /* Complain -- debugfs is enabled, but it failed to
+                 * create the directory. */
+                goto err;
+
+        card->debugfs_root = root;
+
+        if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
+                goto err;
+
+        if (mmc_card_mmc(card) || mmc_card_sd(card))
+                if (!debugfs_create_file("status", S_IRUSR, root, card,
+                                        &mmc_dbg_card_status_fops))
+                        goto err;
+
+        return;
+
+err:
+        debugfs_remove_recursive(root);
+        card->debugfs_root = NULL;
+        dev_err(&card->dev, "failed to initialize debugfs\n");
+}
+
+void mmc_remove_card_debugfs(struct mmc_card *card)
+{
+        debugfs_remove_recursive(card->debugfs_root);
+}
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 1d795c5379b5..6da80fd4d974 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -127,6 +127,10 @@ int mmc_add_host(struct mmc_host *host)
         if (err)
                 return err;
 
+#ifdef CONFIG_DEBUG_FS
+        mmc_add_host_debugfs(host);
+#endif
+
         mmc_start_host(host);
 
         return 0;
@@ -146,6 +150,10 @@ void mmc_remove_host(struct mmc_host *host)
 {
         mmc_stop_host(host);
 
+#ifdef CONFIG_DEBUG_FS
+        mmc_remove_host_debugfs(host);
+#endif
+
         device_del(&host->class_dev);
 
         led_trigger_unregister_simple(host->led);
diff --git a/drivers/mmc/host/atmel-mci-regs.h b/drivers/mmc/host/atmel-mci-regs.h
index a9a5657706c6..26bd80e65031 100644
--- a/drivers/mmc/host/atmel-mci-regs.h
+++ b/drivers/mmc/host/atmel-mci-regs.h
@@ -82,6 +82,8 @@
 # define MCI_OVRE               (  1 <<  30)    /* RX Overrun Error */
 # define MCI_UNRE               (  1 <<  31)    /* TX Underrun Error */
 
+#define MCI_REGS_SIZE           0x100
+
 /* Register access macros */
 #define mci_readl(port,reg)                             \
         __raw_readl((port)->regs + MCI_##reg)
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index cce873c5a149..b68381f7bfdd 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -9,6 +9,7 @@
  */
 #include <linux/blkdev.h>
 #include <linux/clk.h>
+#include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -16,6 +17,8 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/scatterlist.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
 
 #include <linux/mmc/host.h>
 
@@ -88,6 +91,188 @@ struct atmel_mci {
 #define atmci_clear_pending(host, event)                        \
         clear_bit(event, &host->pending_events)
 
+/*
+ * The debugfs stuff below is mostly optimized away when
+ * CONFIG_DEBUG_FS is not set.
+ */
+static int atmci_req_show(struct seq_file *s, void *v)
+{
+        struct atmel_mci        *host = s->private;
+        struct mmc_request      *mrq = host->mrq;
+        struct mmc_command      *cmd;
+        struct mmc_command      *stop;
+        struct mmc_data         *data;
+
+        /* Make sure we get a consistent snapshot */
+        spin_lock_irq(&host->mmc->lock);
+
+        if (mrq) {
+                cmd = mrq->cmd;
+                data = mrq->data;
+                stop = mrq->stop;
+
+                if (cmd)
+                        seq_printf(s,
+                                "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
+                                cmd->opcode, cmd->arg, cmd->flags,
+                                cmd->resp[0], cmd->resp[1], cmd->resp[2],
+                                cmd->resp[2], cmd->error);
+                if (data)
+                        seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
+                                data->bytes_xfered, data->blocks,
+                                data->blksz, data->flags, data->error);
+                if (stop)
+                        seq_printf(s,
+                                "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
+                                stop->opcode, stop->arg, stop->flags,
+                                stop->resp[0], stop->resp[1], stop->resp[2],
+                                stop->resp[2], stop->error);
+        }
+
+        spin_unlock_irq(&host->mmc->lock);
+
+        return 0;
+}
+
+static int atmci_req_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, atmci_req_show, inode->i_private);
+}
+
+static const struct file_operations atmci_req_fops = {
+        .owner          = THIS_MODULE,
+        .open           = atmci_req_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static void atmci_show_status_reg(struct seq_file *s,
+                const char *regname, u32 value)
+{
+        static const char       *sr_bit[] = {
+                [0]     = "CMDRDY",
+                [1]     = "RXRDY",
+                [2]     = "TXRDY",
+                [3]     = "BLKE",
+                [4]     = "DTIP",
+                [5]     = "NOTBUSY",
+                [8]     = "SDIOIRQA",
+                [9]     = "SDIOIRQB",
+                [16]    = "RINDE",
+                [17]    = "RDIRE",
+                [18]    = "RCRCE",
+                [19]    = "RENDE",
+                [20]    = "RTOE",
+                [21]    = "DCRCE",
+                [22]    = "DTOE",
+                [30]    = "OVRE",
+                [31]    = "UNRE",
+        };
+        unsigned int            i;
+
+        seq_printf(s, "%s:\t0x%08x", regname, value);
+        for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
+                if (value & (1 << i)) {
+                        if (sr_bit[i])
+                                seq_printf(s, " %s", sr_bit[i]);
+                        else
+                                seq_puts(s, " UNKNOWN");
+                }
+        }
+        seq_putc(s, '\n');
+}
+
+static int atmci_regs_show(struct seq_file *s, void *v)
+{
+        struct atmel_mci        *host = s->private;
+        u32                     *buf;
+
+        buf = kmalloc(MCI_REGS_SIZE, GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
+
+        /* Grab a more or less consistent snapshot */
+        spin_lock_irq(&host->mmc->lock);
+        memcpy_fromio(buf, host->regs, MCI_REGS_SIZE);
+        spin_unlock_irq(&host->mmc->lock);
+
+        seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n",
+                        buf[MCI_MR / 4],
+                        buf[MCI_MR / 4] & MCI_MR_RDPROOF ? " RDPROOF" : "",
+                        buf[MCI_MR / 4] & MCI_MR_WRPROOF ? " WRPROOF" : "",
+                        buf[MCI_MR / 4] & 0xff);
+        seq_printf(s, "DTOR:\t0x%08x\n", buf[MCI_DTOR / 4]);
+        seq_printf(s, "SDCR:\t0x%08x\n", buf[MCI_SDCR / 4]);
+        seq_printf(s, "ARGR:\t0x%08x\n", buf[MCI_ARGR / 4]);
+        seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
+                        buf[MCI_BLKR / 4],
+                        buf[MCI_BLKR / 4] & 0xffff,
+                        (buf[MCI_BLKR / 4] >> 16) & 0xffff);
+
+        /* Don't read RSPR and RDR; it will consume the data there */
+
+        atmci_show_status_reg(s, "SR", buf[MCI_SR / 4]);
+        atmci_show_status_reg(s, "IMR", buf[MCI_IMR / 4]);
+
+        return 0;
+}
+
+static int atmci_regs_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, atmci_regs_show, inode->i_private);
+}
+
+static const struct file_operations atmci_regs_fops = {
+        .owner          = THIS_MODULE,
+        .open           = atmci_regs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static void atmci_init_debugfs(struct atmel_mci *host)
+{
+        struct mmc_host *mmc;
+        struct dentry   *root;
+        struct dentry   *node;
+        struct resource *res;
+
+        mmc = host->mmc;
+        root = mmc->debugfs_root;
+        if (!root)
+                return;
+
+        node = debugfs_create_file("regs", S_IRUSR, root, host,
+                        &atmci_regs_fops);
+        if (IS_ERR(node))
+                return;
+        if (!node)
+                goto err;
+
+        res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
+        node->d_inode->i_size = res->end - res->start + 1;
+
+        node = debugfs_create_file("req", S_IRUSR, root, host, &atmci_req_fops);
+        if (!node)
+                goto err;
+
+        node = debugfs_create_x32("pending_events", S_IRUSR, root,
+                                     (u32 *)&host->pending_events);
+        if (!node)
+                goto err;
+
+        node = debugfs_create_x32("completed_events", S_IRUSR, root,
+                                     (u32 *)&host->completed_events);
+        if (!node)
+                goto err;
+
+        return;
+
+err:
+        dev_err(&host->pdev->dev,
+                "failed to initialize debugfs for controller\n");
+}
 
 static void atmci_enable(struct atmel_mci *host)
 {
@@ -905,6 +1090,8 @@ static int __init atmci_probe(struct platform_device *pdev)
                         "Atmel MCI controller at 0x%08lx irq %d\n",
                         host->mapbase, irq);
 
+        atmci_init_debugfs(host);
+
         return 0;
 
 err_request_irq:
@@ -923,6 +1110,8 @@ static int __exit atmci_remove(struct platform_device *pdev)
         platform_set_drvdata(pdev, NULL);
 
         if (host) {
+                /* Debugfs stuff is cleaned up by mmc core */
+
                 if (host->detect_pin >= 0) {
                         int pin = host->detect_pin;
 
diff --git a/drivers/mmc/host/imxmmc.c b/drivers/mmc/host/imxmmc.c
index 5e880c0f1349..f61406da65d2 100644
--- a/drivers/mmc/host/imxmmc.c
+++ b/drivers/mmc/host/imxmmc.c
@@ -26,12 +26,6 @@
  *
  */
 
-#ifdef CONFIG_MMC_DEBUG
-#define DEBUG
-#else
-#undef  DEBUG
-#endif
-
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
@@ -907,31 +901,12 @@ static const struct mmc_host_ops imxmci_ops = {
         .get_ro         = imxmci_get_ro,
 };
 
-static struct resource *platform_device_resource(struct platform_device *dev, unsigned int mask, int nr)
-{
-        int i;
-
-        for (i = 0; i < dev->num_resources; i++)
-                if (dev->resource[i].flags == mask && nr-- == 0)
-                        return &dev->resource[i];
-        return NULL;
-}
-
-static int platform_device_irq(struct platform_device *dev, int nr)
-{
-        int i;
-
-        for (i = 0; i < dev->num_resources; i++)
-                if (dev->resource[i].flags == IORESOURCE_IRQ && nr-- == 0)
-                        return dev->resource[i].start;
-        return NO_IRQ;
-}
-
 static void imxmci_check_status(unsigned long data)
 {
         struct imxmci_host *host = (struct imxmci_host *)data;
 
-        if( host->pdata->card_present(mmc_dev(host->mmc)) != host->present ) {
+        if (host->pdata && host->pdata->card_present &&
+            host->pdata->card_present(mmc_dev(host->mmc)) != host->present) {
                 host->present ^= 1;
                 dev_info(mmc_dev(host->mmc), "card %s\n",
                       host->present ? "inserted" : "removed");
@@ -962,13 +937,12 @@ static int imxmci_probe(struct platform_device *pdev)
 
         printk(KERN_INFO "i.MX mmc driver\n");
 
-        r = platform_device_resource(pdev, IORESOURCE_MEM, 0);
-        irq = platform_device_irq(pdev, 0);
-        if (!r || irq == NO_IRQ)
+        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        irq = platform_get_irq(pdev, 0);
+        if (!r || irq < 0)
                 return -ENXIO;
 
-        r = request_mem_region(r->start, 0x100, "IMXMCI");
-        if (!r)
+        if (!request_mem_region(r->start, 0x100, pdev->name))
                 return -EBUSY;
 
         mmc = mmc_alloc_host(sizeof(struct imxmci_host), &pdev->dev);
@@ -995,6 +969,8 @@ static int imxmci_probe(struct platform_device *pdev)
         host->mmc = mmc;
         host->dma_allocated = 0;
         host->pdata = pdev->dev.platform_data;
+        if (!host->pdata)
+                dev_warn(&pdev->dev, "No platform data provided!\n");
 
         spin_lock_init(&host->lock);
         host->res = r;
@@ -1047,7 +1023,11 @@ static int imxmci_probe(struct platform_device *pdev)
         if (ret)
                 goto out;
 
-        host->present = host->pdata->card_present(mmc_dev(mmc));
+        if (host->pdata && host->pdata->card_present)
+                host->present = host->pdata->card_present(mmc_dev(mmc));
+        else    /* if there is no way to detect assume that card is present */
+                host->present = 1;
+
         init_timer(&host->timer);
         host->timer.data = (unsigned long)host;
         host->timer.function = imxmci_check_status;
@@ -1073,7 +1053,7 @@ out:
         }
         if (mmc)
                 mmc_free_host(mmc);
-        release_resource(r);
+        release_mem_region(r->start, 0x100);
         return ret;
 }
 
@@ -1102,7 +1082,7 @@ static int imxmci_remove(struct platform_device *pdev)
                 clk_disable(host->clk);
                 clk_put(host->clk);
 
-                release_resource(host->res);
+                release_mem_region(host->res->start, 0x100);
 
                 mmc_free_host(mmc);
         }
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 41cc63360e43..7503b81374e0 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -1076,6 +1076,7 @@ static void mmc_spi_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                  */
                 if (canpower && ios->power_mode == MMC_POWER_OFF) {
                         int mres;
+                        u8 nullbyte = 0;
 
                         host->spi->mode &= ~(SPI_CPOL|SPI_CPHA);
                         mres = spi_setup(host->spi);
@@ -1083,7 +1084,7 @@ static void mmc_spi_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                                 dev_dbg(&host->spi->dev,
                                         "switch to SPI mode 0 failed\n");
 
-                        if (spi_w8r8(host->spi, 0x00) < 0)
+                        if (spi_write(host->spi, &nullbyte, 1) < 0)
                                 dev_dbg(&host->spi->dev,
                                         "put spi signals to low failed\n");
 
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 0d508ac17d64..ee6e822d5994 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -111,6 +111,8 @@ struct mmc_card {
         unsigned                num_info;       /* number of info strings */
         const char              **info;         /* info strings */
         struct sdio_func_tuple  *tuples;        /* unknown common tuples */
+
+        struct dentry           *debugfs_root;
 };
 
 #define mmc_card_mmc(c)         ((c)->type == MMC_TYPE_MMC)
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 10a2080086ca..9c288c909878 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -157,6 +157,8 @@ struct mmc_host {
         struct led_trigger      *led;           /* activity led */
 #endif
 
+        struct dentry           *debugfs_root;
+
         unsigned long           private[0] ____cacheline_aligned;
 };