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Subject[PATCH 15/18] MMC: OMAP: Move failing command abortion to workqueue
From: Jarkko Lavinen <jarkko.lavinen@nokia.com>

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

Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com>
---
drivers/mmc/host/omap.c | 82 ++++++++++++++++++++++++++++-------------------
1 files changed, 49 insertions(+), 33 deletions(-)
diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 276ccf4..df15d96 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -135,8 +135,9 @@ 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);
-- 1.5.3.GIT


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