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Subject[PATCH 17/18] MMC: OMAP: Start new commands from work queue instead of irq
From: Jarkko Lavinen <jarkko.lavinen@nokia.com>

Use work queues for starting new commands instead of starting them
directly from irq handler. The command scheduling needs to be delayed
a bit for some cards which should not be done from an interrupt.

Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com>
---
drivers/mmc/host/omap.c | 48 +++++++++++++++++++++++++++++++++++++++++-----
1 files changed, 42 insertions(+), 6 deletions(-)
diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 19001d3..b28ae3b 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -138,6 +138,11 @@ struct mmc_omap_host {
unsigned abort:1;
struct timer_list cmd_abort_timer;

+ struct work_struct slot_release_work;
+ struct mmc_omap_slot *next_slot;
+ struct work_struct send_stop_work;
+ struct mmc_data *stop_data;
+
unsigned int sg_len;
int sg_idx;
u16 * buffer;
@@ -236,6 +241,21 @@ no_claim:
static void mmc_omap_start_request(struct mmc_omap_host *host,
struct mmc_request *req);

+static void mmc_omap_slot_release_work(struct work_struct *work)
+{
+ struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
+ slot_release_work);
+ struct mmc_omap_slot *next_slot = host->next_slot;
+ struct mmc_request *rq;
+
+ host->next_slot = NULL;
+ mmc_omap_select_slot(next_slot, 1);
+
+ rq = next_slot->mrq;
+ next_slot->mrq = NULL;
+ mmc_omap_start_request(host, rq);
+}
+
static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled)
{
struct mmc_omap_host *host = slot->host;
@@ -257,21 +277,19 @@ static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled)
/* Check for any pending requests */
for (i = 0; i < host->nr_slots; i++) {
struct mmc_omap_slot *new_slot;
- struct mmc_request *rq;

if (host->slots[i] == NULL || host->slots[i]->mrq == NULL)
continue;

+ BUG_ON(host->next_slot != NULL);
new_slot = host->slots[i];
/* The current slot should not have a request in queue */
BUG_ON(new_slot == host->current_slot);

+ host->next_slot = new_slot;
host->mmc = new_slot->mmc;
spin_unlock_irqrestore(&host->slot_lock, flags);
- mmc_omap_select_slot(new_slot, 1);
- rq = new_slot->mrq;
- new_slot->mrq = NULL;
- mmc_omap_start_request(host, rq);
+ schedule_work(&host->slot_release_work);
return;
}

@@ -400,6 +418,20 @@ mmc_omap_release_dma(struct mmc_omap_host *host, struct mmc_data *data,
dma_data_dir);
}

+static void mmc_omap_send_stop_work(struct work_struct *work)
+{
+ struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
+ send_stop_work);
+ struct mmc_omap_slot *slot = host->current_slot;
+ struct mmc_data *data = host->stop_data;
+ unsigned long tick_ns;
+
+ tick_ns = (1000000000 + slot->fclk_freq - 1)/slot->fclk_freq;
+ ndelay(8*tick_ns);
+
+ mmc_omap_start_command(host, data->stop);
+}
+
static void
mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
{
@@ -424,7 +456,8 @@ mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
return;
}

- mmc_omap_start_command(host, data->stop);
+ host->stop_data = data;
+ schedule_work(&host->send_stop_work);
}

static void
@@ -1389,6 +1422,9 @@ static int __init mmc_omap_probe(struct platform_device *pdev)
goto err_free_mem_region;
}

+ INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work);
+ INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work);
+
INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command);
setup_timer(&host->cmd_abort_timer, mmc_omap_cmd_timer,
(unsigned long) host);
-- 1.5.3.GIT


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