From 0f602ec79ac4fd2a42075c5a170086ded439f36d Mon Sep 17 00:00:00 2001 From: Jarkko Lavinen Date: Wed, 26 Mar 2008 16:09:58 -0400 Subject: MMC: OMAP: Start new commands from work queue instead of irq 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 Signed-off-by: Pierre Ossman --- drivers/mmc/host/omap.c | 48 ++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 42 insertions(+), 6 deletions(-) (limited to 'drivers') diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c index 3d59c5d81b3d..ab0974d261e5 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); -- cgit v1.2.2