Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759525AbYCNTma (ORCPT ); Fri, 14 Mar 2008 15:42:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758283AbYCNTlE (ORCPT ); Fri, 14 Mar 2008 15:41:04 -0400 Received: from smtp.nokia.com ([192.100.122.233]:46085 "EHLO mgw-mx06.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759178AbYCNTlC (ORCPT ); Fri, 14 Mar 2008 15:41:02 -0400 Message-ID: <47DAD3C6.5080900@indt.org.br> Date: Fri, 14 Mar 2008 15:36:38 -0400 From: Carlos Aguiar User-Agent: Thunderbird 1.5.0.12 (X11/20070604) MIME-Version: 1.0 To: Pierre Ossman CC: Tony Lindgren , linux-kernel@vger.kernel.org Subject: [PATCH 11/18] MMC: OMAP: Abort stuck commands X-Enigmail-Version: 0.94.0.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 14 Mar 2008 19:39:18.0368 (UTC) FILETIME=[17E49E00:01C8860B] X-Nokia-AV: Clean Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4887 Lines: 172 From: Jarkko Lavinen When a card is removed while it is being accessed, a command can get stuck so that no timeout or end of command interrupt ever occurs. The command getting stuck is almost always CDM12, but also the other commands can get stuck. Catch a stuck command with a timer and try sending the initiliazation stream until the controller starts running again and responds with the end of command status. Signed-off-by: Jarkko Lavinen Signed-off-by: Carlos Eduardo Aguiar Signed-off-by: Tony Lindgren --- drivers/mmc/host/omap.c | 93 ++++++++++++++++++++++++++++++++++++++++++----- 1 files changed, 83 insertions(+), 10 deletions(-) diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c index ae0de17..f9cbda3 100644 --- a/drivers/mmc/host/omap.c +++ b/drivers/mmc/host/omap.c @@ -134,6 +134,9 @@ struct mmc_omap_host { unsigned char bus_mode; unsigned char hw_bus_mode; + struct work_struct cmd_abort; + struct timer_list cmd_timer; + unsigned int sg_len; int sg_idx; u16 * buffer; @@ -314,6 +317,8 @@ 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); + OMAP_MMC_WRITE(host, CTO, 200); OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff); OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16); @@ -373,9 +378,37 @@ mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data) } static void +mmc_omap_send_abort(struct mmc_omap_host *host) +{ + struct mmc_omap_slot *slot = host->current_slot; + unsigned int restarts, passes, timeout; + u16 stat = 0; + + /* 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) { + OMAP_MMC_WRITE(host, STAT, 0xFFFF); + OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7)); + + passes = 0; + while (passes < timeout) { + stat = OMAP_MMC_READ(host, STAT); + if (stat & OMAP_MMC_STAT_END_OF_CMD) + goto out; + udelay(1); + passes++; + } + + restarts++; + } +out: + OMAP_MMC_WRITE(host, STAT, stat); +} + +static void mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data) { - int loops; u16 ie; if (host->dma_in_use) @@ -386,16 +419,8 @@ mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data) ie = OMAP_MMC_READ(host, IE); OMAP_MMC_WRITE(host, IE, 0); - OMAP_MMC_WRITE(host, CMD, 1 << 7); - loops = 0; - while (!(OMAP_MMC_READ(host, STAT) & OMAP_MMC_STAT_END_OF_CMD)) { - udelay(1); - loops++; - if (loops == 100000) - break; - } - OMAP_MMC_WRITE(host, STAT, OMAP_MMC_STAT_END_OF_CMD); OMAP_MMC_WRITE(host, IE, ie); + mmc_omap_send_abort(host); } static void @@ -451,6 +476,8 @@ mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd) { host->cmd = NULL; + del_timer(&host->cmd_timer); + if (cmd->flags & MMC_RSP_PRESENT) { if (cmd->flags & MMC_RSP_136) { /* response type 2 */ @@ -486,6 +513,47 @@ mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd) } } +/* + * Abort stuck command. Can occur when card is removed while it is being + * read. + */ +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; + } + + 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); + + host->data = NULL; + host->sg_len = 0; + + mmc_omap_send_abort(host); + host->cmd->error = -ETIMEDOUT; + mmc_omap_cmd_done(host, host->cmd); + OMAP_MMC_WRITE(host, IE, ie); +} + +static void +mmc_omap_cmd_timer(unsigned long data) +{ + struct mmc_omap_host *host = (struct mmc_omap_host *) data; + + schedule_work(&host->cmd_abort); +} + /* PIO only */ static void mmc_omap_sg_to_buf(struct mmc_omap_host *host) @@ -1255,6 +1323,11 @@ static int __init mmc_omap_probe(struct platform_device *pdev) goto err_free_mem_region; } + INIT_WORK(&host->cmd_abort, mmc_omap_abort_command); + init_timer(&host->cmd_timer); + host->cmd_timer.function = mmc_omap_cmd_timer; + host->cmd_timer.data = (unsigned long) host; + spin_lock_init(&host->dma_lock); init_timer(&host->dma_timer); spin_lock_init(&host->slot_lock); -- 1.5.3.GIT -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/