From patchwork Tue Aug 28 13:19:06 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Venkatraman S X-Patchwork-Id: 1381451 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 6ACEDE0004 for ; Tue, 28 Aug 2012 13:19:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752658Ab2H1NTa (ORCPT ); Tue, 28 Aug 2012 09:19:30 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:36920 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752860Ab2H1NT2 (ORCPT ); Tue, 28 Aug 2012 09:19:28 -0400 Received: from dlelxv30.itg.ti.com ([172.17.2.17]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id q7SDJQ6N008537; Tue, 28 Aug 2012 08:19:27 -0500 Received: from DLEE74.ent.ti.com (dlee74.ent.ti.com [157.170.170.8]) by dlelxv30.itg.ti.com (8.13.8/8.13.8) with ESMTP id q7SDJQg6026010; Tue, 28 Aug 2012 08:19:26 -0500 Received: from dlelxv24.itg.ti.com (172.17.1.199) by DLEE74.ent.ti.com (157.170.170.8) with Microsoft SMTP Server id 14.1.323.3; Tue, 28 Aug 2012 08:19:26 -0500 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dlelxv24.itg.ti.com (8.13.8/8.13.8) with ESMTP id q7SDJQUb021780; Tue, 28 Aug 2012 08:19:26 -0500 Received: from localhost (h81-173.vpn.ti.com [172.24.81.173]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id q7SDJLr13322; Tue, 28 Aug 2012 08:19:22 -0500 (CDT) From: Venkatraman S To: , CC: , , Venkatraman S Subject: [PATCHv2 1/2] mmc: omap_hsmmc: convert from IP timer to hrtimer Date: Tue, 28 Aug 2012 18:49:06 +0530 Message-ID: <1346159947-3194-1-git-send-email-svenkatr@ti.com> X-Mailer: git-send-email 1.7.11.1.25.g0e18bef MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org omap hsmmc controller IP has a built in timer that can be programmed to guard against unresponsive operations. But its range is very narrow, and the maximum countable time is a few seconds. Card maintenance operations like BKOPS and MMC_ERASE and long stream writes like packed command require timers of order of several minutes, much beyond the capability of the IP timer. So get rid of using the IP timer entirely and use kernel's hrtimer functionality for guarding the device operations. As part of this change, a workaround that disabled timeouts for MMC_ERASE command is removed, and the arbitary timing of 100ms is used only when the timeout is not explicitly specified by core. A trivial change to get rid of unnecessary dealiasing of host->data in omap_hsmmc_do_irq is also included. Signed-off-by: Venkatraman S Reviewed-by: Felipe Balbi --- v1->v2: Fix typos in commit message. Add checks to handle subtle races between MMC IRQ and HRTIMER IRQ Mark set_guard_timer function as static (Felipe's comment to use macros for INT_EN_MASK is done as a separate patch ) drivers/mmc/host/omap_hsmmc.c | 96 ++++++++++++++++++++++--------------------- 1 file changed, 50 insertions(+), 46 deletions(-) diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index 9afdd20..57e86a4 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -79,7 +79,7 @@ #define CLKD_SHIFT 6 #define DTO_MASK 0x000F0000 #define DTO_SHIFT 16 -#define INT_EN_MASK 0x307F0033 +#define INT_EN_MASK 0x306E0033 #define BWR_ENABLE (1 << 4) #define BRR_ENABLE (1 << 5) #define DTO_ENABLE (1 << 20) @@ -160,6 +160,7 @@ struct omap_hsmmc_host { unsigned int dma_sg_idx; unsigned char bus_mode; unsigned char power_mode; + unsigned int ns_per_clk_cycle; int suspended; int irq; int use_dma, dma_ch; @@ -172,6 +173,7 @@ struct omap_hsmmc_host { int reqs_blocked; int use_reg; int req_in_progress; + struct hrtimer guard_timer; struct omap_hsmmc_next next_data; struct omap_mmc_platform_data *pdata; @@ -455,10 +457,6 @@ static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host, else irq_mask = INT_EN_MASK; - /* Disable timeout for erases */ - if (cmd->opcode == MMC_ERASE) - irq_mask &= ~DTO_ENABLE; - OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); OMAP_HSMMC_WRITE(host->base, ISE, irq_mask); OMAP_HSMMC_WRITE(host->base, IE, irq_mask); @@ -508,6 +506,9 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) && time_before(jiffies, timeout)) cpu_relax(); + if (ios->clock) + host->ns_per_clk_cycle = DIV_ROUND_UP(NSEC_PER_SEC, ios->clock); + omap_hsmmc_start_clock(host); } @@ -824,7 +825,7 @@ omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data) omap_hsmmc_request_done(host, mrq); return; } - + hrtimer_cancel(&host->guard_timer); host->data = NULL; if (!data->error) @@ -859,8 +860,11 @@ omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd) cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10); } } - if ((host->data == NULL && !host->response_busy) || cmd->error) + if ((host->data == NULL && !host->response_busy) || cmd->error) { + if (cmd->error != -ETIMEDOUT) + hrtimer_cancel(&host->guard_timer); omap_hsmmc_request_done(host, cmd->mrq); + } } /* @@ -992,7 +996,7 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status) hsmmc_command_incomplete(host, -EILSEQ); end_cmd = 1; - if (host->data || host->response_busy) { + if (data || host->response_busy) { end_trans = 1; host->response_busy = 0; } @@ -1292,41 +1296,35 @@ static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host, return 0; } -static void set_data_timeout(struct omap_hsmmc_host *host, - unsigned int timeout_ns, - unsigned int timeout_clks) +static void set_guard_timer(struct omap_hsmmc_host *host, + unsigned long timeout_ms, unsigned long timeout_ns, + unsigned int timeout_clks) { - unsigned int timeout, cycle_ns; - uint32_t reg, clkd, dto = 0; + ktime_t gtime; + unsigned int sec, nsec; - reg = OMAP_HSMMC_READ(host->base, SYSCTL); - clkd = (reg & CLKD_MASK) >> CLKD_SHIFT; - if (clkd == 0) - clkd = 1; + sec = timeout_ms / MSEC_PER_SEC; + nsec = (timeout_ms % MSEC_PER_SEC) * NSEC_PER_MSEC + timeout_ns; - cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd); - timeout = timeout_ns / cycle_ns; - timeout += timeout_clks; - if (timeout) { - while ((timeout & 0x80000000) == 0) { - dto += 1; - timeout <<= 1; - } - dto = 31 - dto; - timeout <<= 1; - if (timeout && dto) - dto += 1; - if (dto >= 13) - dto -= 13; - else - dto = 0; - if (dto > 14) - dto = 14; - } + nsec += timeout_clks * host->ns_per_clk_cycle; + gtime = ktime_set(sec, nsec); - reg &= ~DTO_MASK; - reg |= dto << DTO_SHIFT; - OMAP_HSMMC_WRITE(host->base, SYSCTL, reg); + hrtimer_start(&host->guard_timer, gtime, HRTIMER_MODE_REL); +} + +static enum hrtimer_restart omap_hsmmc_timedout(struct hrtimer *gtimer) +{ + struct omap_hsmmc_host *host; + host = container_of(gtimer, struct omap_hsmmc_host, guard_timer); + if (host->req_in_progress) { + omap_hsmmc_disable_irq(host); + hsmmc_command_incomplete(host, -ETIMEDOUT); + host->response_busy = 0; + omap_hsmmc_cmd_done(host, host->cmd); + if (host->data) + omap_hsmmc_xfer_done(host, host->data); + } + return HRTIMER_NORESTART; } /* @@ -1340,18 +1338,22 @@ omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req) if (req->data == NULL) { OMAP_HSMMC_WRITE(host->base, BLK, 0); - /* - * Set an arbitrary 100ms data timeout for commands with - * busy signal. - */ - if (req->cmd->flags & MMC_RSP_BUSY) - set_data_timeout(host, 100000000U, 0); + if (req->cmd->cmd_timeout_ms == 0) { + /* + * Set an arbitrary 100ms data timeout for commands with + * busy signal. + */ + set_guard_timer(host, 100, 0, 0); + } else { + set_guard_timer(host, req->cmd->cmd_timeout_ms, 0, 0); + } return 0; } OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz) | (req->data->blocks << 16)); - set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks); + set_guard_timer(host, 0, req->data->timeout_ns, + req->data->timeout_clks); if (host->use_dma) { ret = omap_hsmmc_start_dma_transfer(host, req); @@ -1921,6 +1923,8 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev) pdata->suspend = omap_hsmmc_suspend_cdirq; pdata->resume = omap_hsmmc_resume_cdirq; } + hrtimer_init(&host->guard_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + host->guard_timer.function = omap_hsmmc_timedout; omap_hsmmc_disable_irq(host);