MMC: OMAP: Move failing command abortion to workqueue

Abort failed command from workqueue rather than from an interrupt,
allowing longer delays in abortion.

Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 98c886b48ef39e56aeae5db7a30cb8d575505f0f..234b7d7c74de5dddf193276e82ec7f4c8d185657 100644 (file)
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -136,8 +136,9 @@ struct mmc_omap_host {
        unsigned char           bus_mode;
        unsigned char           hw_bus_mode;
 
-       struct work_struct      cmd_abort;
-       struct timer_list       cmd_timer;
+       struct work_struct      cmd_abort_work;
+       unsigned                abort:1;
+       struct timer_list       cmd_abort_timer;
 
        unsigned int            sg_len;
        int                     sg_idx;
@@ -335,7 +336,7 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
        if (host->data && !(host->data->flags & MMC_DATA_WRITE))
                cmdreg |= 1 << 15;
 
-       mod_timer(&host->cmd_timer, jiffies + HZ/2);
+       mod_timer(&host->cmd_abort_timer, jiffies + HZ/2);
 
        OMAP_MMC_WRITE(host, CTO, 200);
        OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
@@ -396,7 +397,7 @@ mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
 }
 
 static void
-mmc_omap_send_abort(struct mmc_omap_host *host)
+mmc_omap_send_abort(struct mmc_omap_host *host, int maxloops)
 {
        struct mmc_omap_slot *slot = host->current_slot;
        unsigned int restarts, passes, timeout;
@@ -405,7 +406,7 @@ mmc_omap_send_abort(struct mmc_omap_host *host)
        /* Sending abort takes 80 clocks. Have some extra and round up */
        timeout = (120*1000000 + slot->fclk_freq - 1)/slot->fclk_freq;
        restarts = 0;
-       while (restarts < 10000) {
+       while (restarts < maxloops) {
                OMAP_MMC_WRITE(host, STAT, 0xFFFF);
                OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7));
 
@@ -427,18 +428,13 @@ out:
 static void
 mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data)
 {
-       u16 ie;
-
        if (host->dma_in_use)
                mmc_omap_release_dma(host, data, 1);
 
        host->data = NULL;
        host->sg_len = 0;
 
-       ie = OMAP_MMC_READ(host, IE);
-       OMAP_MMC_WRITE(host, IE, 0);
-       OMAP_MMC_WRITE(host, IE, ie);
-       mmc_omap_send_abort(host);
+       mmc_omap_send_abort(host, 10000);
 }
 
 static void
@@ -494,7 +490,7 @@ mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
 {
        host->cmd = NULL;
 
-       del_timer(&host->cmd_timer);
+       del_timer(&host->cmd_abort_timer);
 
        if (cmd->flags & MMC_RSP_PRESENT) {
                if (cmd->flags & MMC_RSP_136) {
@@ -538,38 +534,48 @@ mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
 static void mmc_omap_abort_command(struct work_struct *work)
 {
        struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
-                                                 cmd_abort);
-       u16 ie;
-
-       ie = OMAP_MMC_READ(host, IE);
-       OMAP_MMC_WRITE(host, IE, 0);
-
-       if (!host->cmd) {
-               OMAP_MMC_WRITE(host, IE, ie);
-               return;
-       }
+                                                 cmd_abort_work);
+       BUG_ON(!host->cmd);
 
        dev_dbg(mmc_dev(host->mmc), "Aborting stuck command CMD%d\n",
                host->cmd->opcode);
 
-       if (host->data && host->dma_in_use)
-               mmc_omap_release_dma(host, host->data, 1);
+       if (host->cmd->error == 0)
+               host->cmd->error = -ETIMEDOUT;
 
-       host->data = NULL;
-       host->sg_len = 0;
+       if (host->data == NULL) {
+               struct mmc_command *cmd;
+               struct mmc_host    *mmc;
+
+               cmd = host->cmd;
+               host->cmd = NULL;
+               mmc_omap_send_abort(host, 10000);
+
+               host->mrq = NULL;
+               mmc = host->mmc;
+               mmc_omap_release_slot(host->current_slot);
+               mmc_request_done(mmc, cmd->mrq);
+       } else
+               mmc_omap_cmd_done(host, host->cmd);
 
-       mmc_omap_send_abort(host);
-       host->cmd->error = -ETIMEDOUT;
-       mmc_omap_cmd_done(host, host->cmd);
-       OMAP_MMC_WRITE(host, IE, ie);
+       host->abort = 0;
+       enable_irq(host->irq);
 }
 
 static void
 mmc_omap_cmd_timer(unsigned long data)
 {
        struct mmc_omap_host *host = (struct mmc_omap_host *) data;
+       unsigned long flags;
 
-       schedule_work(&host->cmd_abort);
+       spin_lock_irqsave(&host->slot_lock, flags);
+       if (host->cmd != NULL && !host->abort) {
+               OMAP_MMC_WRITE(host, IE, 0);
+               disable_irq(host->irq);
+               host->abort = 1;
+               schedule_work(&host->cmd_abort_work);
+       }
+       spin_unlock_irqrestore(&host->slot_lock, flags);
 }
 
 /* PIO only */
@@ -746,6 +752,15 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
                }
        }
 
+       if (cmd_error && host->data) {
+               del_timer(&host->cmd_abort_timer);
+               host->abort = 1;
+               OMAP_MMC_WRITE(host, IE, 0);
+               disable_irq(host->irq);
+               schedule_work(&host->cmd_abort_work);
+               return IRQ_HANDLED;
+       }
+
        if (end_command)
                mmc_omap_cmd_done(host, host->cmd);
        if (host->data != NULL) {
@@ -1356,8 +1371,9 @@ static int __init mmc_omap_probe(struct platform_device *pdev)
                goto err_free_mem_region;
        }
 
-       INIT_WORK(&host->cmd_abort, mmc_omap_abort_command);
-       setup_timer(&host->cmd_timer, mmc_omap_cmd_timer, (unsigned long) host);
+       INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command);
+       setup_timer(&host->cmd_abort_timer, mmc_omap_cmd_timer,
+                   (unsigned long) host);
 
        spin_lock_init(&host->dma_lock);
        setup_timer(&host->dma_timer, mmc_omap_dma_timer, (unsigned long) host);