diff options
author | San Mehat <san@google.com> | 2009-11-23 02:19:07 +0100 |
---|---|---|
committer | Daniel Walker <dwalker@codeaurora.org> | 2010-03-18 21:37:07 +0100 |
commit | c7fc9370df1433486dfa9460a833fae664e8be6c (patch) | |
tree | 0eb624992f24588a5f6916608f23da31bb157fc4 /drivers/mmc | |
parent | mmc: msm_sdcc: Reduce command timeouts and improve reliability. (diff) | |
download | linux-c7fc9370df1433486dfa9460a833fae664e8be6c.tar.xz linux-c7fc9370df1433486dfa9460a833fae664e8be6c.zip |
mmc: msm_sdcc: Fix bug where busclk expiry timer was not properly disabled
Signed-off-by: San Mehat <san@google.com>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r-- | drivers/mmc/host/msm_sdcc.c | 99 | ||||
-rw-r--r-- | drivers/mmc/host/msm_sdcc.h | 1 |
2 files changed, 52 insertions, 48 deletions
diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c index 524858597901..591ef3c4e9a7 100644 --- a/drivers/mmc/host/msm_sdcc.c +++ b/drivers/mmc/host/msm_sdcc.c @@ -48,7 +48,7 @@ #define DRIVER_NAME "msm-sdcc" -#define BUSCLK_TIMEOUT (HZ * 5) +#define BUSCLK_TIMEOUT (HZ) static unsigned int msmsdcc_fmin = 144000; static unsigned int msmsdcc_fmax = 50000000; static unsigned int msmsdcc_4bit = 1; @@ -60,29 +60,42 @@ static unsigned int msmsdcc_sdioirq; #define CMD_SPINMAX 20 -static inline int -msmsdcc_enable_clocks(struct msmsdcc_host *host, int enable) +static inline void +msmsdcc_disable_clocks(struct msmsdcc_host *host, int deferr) { - int rc; + WARN_ON(!host->clks_on); - WARN_ON(enable == host->clks_on); - if (enable) { - rc = clk_enable(host->pclk); - if (rc) - return rc; - rc = clk_enable(host->clk); - if (rc) { - clk_disable(host->pclk); - return rc; - } - udelay(1 + ((3 * USEC_PER_SEC) / - (host->clk_rate ? host->clk_rate : msmsdcc_fmin))); - host->clks_on = 1; + if (deferr) { + mod_timer(&host->busclk_timer, jiffies + BUSCLK_TIMEOUT); } else { + del_timer_sync(&host->busclk_timer); +// dev_info(mmc_dev(host->mmc), "Immediate clock shutdown\n"); clk_disable(host->clk); clk_disable(host->pclk); host->clks_on = 0; } +} + +static inline int +msmsdcc_enable_clocks(struct msmsdcc_host *host) +{ + int rc; + + WARN_ON(host->clks_on); + + del_timer_sync(&host->busclk_timer); + + rc = clk_enable(host->pclk); + if (rc) + return rc; + rc = clk_enable(host->clk); + if (rc) { + clk_disable(host->pclk); + return rc; + } + udelay(1 + ((3 * USEC_PER_SEC) / + (host->clk_rate ? host->clk_rate : msmsdcc_fmin))); + host->clks_on = 1; return 0; } @@ -118,8 +131,7 @@ msmsdcc_request_end(struct msmsdcc_host *host, struct mmc_request *mrq) if (mrq->cmd->error == -ETIMEDOUT) mdelay(5); - if (host->use_bustimer) - mod_timer(&host->busclk_timer, jiffies + BUSCLK_TIMEOUT); + msmsdcc_disable_clocks(host, 1); /* * Need to drop the host lock here; mmc_request_done may call * back into the driver... @@ -240,12 +252,12 @@ msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd, if (!mrq->data->error) host->curr.data_xfered = host->curr.xfer_size; if (!mrq->data->stop || mrq->cmd->error) { - msmsdcc_writel(host, 0, MMCICOMMAND); host->curr.mrq = NULL; host->curr.cmd = NULL; mrq->data->bytes_xfered = host->curr.data_xfered; spin_unlock_irqrestore(&host->lock, flags); + msmsdcc_disable_clocks(host, 1); mmc_request_done(host->mmc, mrq); return; } else @@ -835,8 +847,14 @@ msmsdcc_request(struct mmc_host *mmc, struct mmc_request *mrq) } host->curr.mrq = mrq; + + /* Need to drop the host lock here in case + * the busclk wd fires + */ + spin_unlock_irqrestore(&host->lock, flags); if (!host->clks_on) - msmsdcc_enable_clocks(host, 1); + msmsdcc_enable_clocks(host); + spin_lock_irqsave(&host->lock, flags); if (mrq->data && mrq->data->flags & MMC_DATA_READ) /* Queue/read data, daisy-chain command when data starts */ @@ -867,9 +885,10 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) int rc; unsigned long flags; - spin_lock_irqsave(&host->lock, flags); if (!host->clks_on) - msmsdcc_enable_clocks(host, 1); + msmsdcc_enable_clocks(host); + + spin_lock_irqsave(&host->lock, flags); if (ios->clock) { if (ios->clock != host->clk_rate) { @@ -915,8 +934,7 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) host->pwr = pwr; msmsdcc_writel(host, pwr, MMCIPOWER); } - if (host->clks_on) - msmsdcc_enable_clocks(host, 0); + msmsdcc_disable_clocks(host, 1); spin_unlock_irqrestore(&host->lock, flags); } @@ -1001,9 +1019,9 @@ msmsdcc_busclk_expired(unsigned long _data) unsigned long flags; spin_lock_irqsave(&host->lock, flags); + dev_info(mmc_dev(host->mmc), "Bus clock timer expired\n"); if (host->clks_on) - msmsdcc_enable_clocks(host, 0); - + msmsdcc_disable_clocks(host, 0); spin_unlock_irqrestore(&host->lock, flags); } @@ -1110,8 +1128,6 @@ msmsdcc_probe(struct platform_device *pdev) host->cmdpoll = 1; - host->use_bustimer = 1; - host->base = ioremap(memres->start, PAGE_SIZE); if (!host->base) { ret = -ENOMEM; @@ -1143,7 +1159,7 @@ msmsdcc_probe(struct platform_device *pdev) } /* Enable clocks */ - ret = msmsdcc_enable_clocks(host, 1); + ret = msmsdcc_enable_clocks(host); if (ret) goto clk_put; @@ -1263,8 +1279,7 @@ msmsdcc_probe(struct platform_device *pdev) if (host->timer.function) pr_info("%s: Polling status mode enabled\n", mmc_hostname(mmc)); - if (host->use_bustimer) - mod_timer(&host->busclk_timer, jiffies + BUSCLK_TIMEOUT); + msmsdcc_disable_clocks(host, 1); return 0; cmd_irq_free: free_irq(cmd_irqres->start, host); @@ -1272,7 +1287,7 @@ msmsdcc_probe(struct platform_device *pdev) if (host->stat_irq) free_irq(host->stat_irq, host); clk_disable: - msmsdcc_enable_clocks(host, 0); + msmsdcc_disable_clocks(host, 0); clk_put: clk_put(host->clk); pclk_put: @@ -1293,8 +1308,6 @@ msmsdcc_suspend(struct platform_device *dev, pm_message_t state) if (mmc) { struct msmsdcc_host *host = mmc_priv(mmc); - if (host->use_bustimer) - del_timer_sync(&host->busclk_timer); spin_lock_irqsave(&host->lock, flags); if (host->stat_irq) disable_irq(host->stat_irq); @@ -1304,10 +1317,10 @@ msmsdcc_suspend(struct platform_device *dev, pm_message_t state) if (!rc) { msmsdcc_writel(host, 0, MMCIMASK0); - if (host->clks_on) - msmsdcc_enable_clocks(host, 0); } spin_unlock_irqrestore(&host->lock, flags); + if (host->clks_on) + msmsdcc_disable_clocks(host, 0); } return rc; } @@ -1316,27 +1329,19 @@ static int msmsdcc_resume(struct platform_device *dev) { struct mmc_host *mmc = mmc_get_drvdata(dev); - unsigned long flags; if (mmc) { struct msmsdcc_host *host = mmc_priv(mmc); - spin_lock_irqsave(&host->lock, flags); - - if (!host->clks_on) - msmsdcc_enable_clocks(host, 1); - - if (host->use_bustimer) - mod_timer(&host->busclk_timer, jiffies + BUSCLK_TIMEOUT); + msmsdcc_enable_clocks(host); msmsdcc_writel(host, host->saved_irq0mask, MMCIMASK0); - spin_unlock_irqrestore(&host->lock, flags); - if (mmc->card && mmc->card->type != MMC_TYPE_SDIO) mmc_resume_host(mmc); if (host->stat_irq) enable_irq(host->stat_irq); + msmsdcc_disable_clocks(host, 1); } return 0; } diff --git a/drivers/mmc/host/msm_sdcc.h b/drivers/mmc/host/msm_sdcc.h index 361cb6efd248..da0039c9285e 100644 --- a/drivers/mmc/host/msm_sdcc.h +++ b/drivers/mmc/host/msm_sdcc.h @@ -215,7 +215,6 @@ struct msmsdcc_host { struct clk *pclk; /* SDCC peripheral bus clock */ unsigned int clks_on; /* set if clocks are enabled */ struct timer_list busclk_timer; - int use_bustimer; unsigned int eject; /* eject state */ |