forked from Minki/linux
mmc: msm_sdcc: Driver clocking/irq improvements
- Clocks are now disabled after 1 second of inactivity - Fixed issue which was causing us to loop through our ISR twice - Bump core clock enable delay to 30us Signed-off-by: San Mehat <san@google.com> Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
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5b00f40f90
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@ -57,6 +57,32 @@ static unsigned int msmsdcc_sdioirq;
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#define PIO_SPINMAX 30
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#define CMD_SPINMAX 20
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static inline int
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msmsdcc_enable_clocks(struct msmsdcc_host *host, int enable)
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{
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int rc;
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WARN_ON(enable == host->clks_on);
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if (enable) {
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rc = clk_enable(host->pclk);
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if (rc)
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return rc;
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rc = clk_enable(host->clk);
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if (rc) {
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clk_disable(host->pclk);
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return rc;
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}
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udelay(30);
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host->clks_on = 1;
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} else {
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clk_disable(host->clk);
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clk_disable(host->pclk);
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host->clks_on = 0;
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}
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return 0;
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}
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static void
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msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd,
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u32 c);
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@ -76,6 +102,8 @@ msmsdcc_request_end(struct msmsdcc_host *host, struct mmc_request *mrq)
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if (mrq->cmd->error == -ETIMEDOUT)
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mdelay(5);
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if (host->use_bustimer)
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mod_timer(&host->busclk_timer, jiffies + HZ);
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/*
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* Need to drop the host lock here; mmc_request_done may call
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* back into the driver...
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@ -676,6 +704,12 @@ msmsdcc_irq(int irq, void *dev_id)
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status &= (readl(base + MMCIMASK0) | MCI_DATABLOCKENDMASK);
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writel(status, base + MMCICLEAR);
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if (status & MCI_SDIOINTR)
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status &= ~MCI_SDIOINTR;
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if (!status)
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break;
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msmsdcc_handle_irq_data(host, status, base);
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if (status & (MCI_CMDSENT | MCI_CMDRESPEND | MCI_CMDCRCFAIL |
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@ -729,6 +763,8 @@ msmsdcc_request(struct mmc_host *mmc, struct mmc_request *mrq)
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}
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host->curr.mrq = mrq;
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if (!host->clks_on)
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msmsdcc_enable_clocks(host, 1);
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if (mrq->data && mrq->data->flags & MMC_DATA_READ)
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msmsdcc_start_data(host, mrq->data);
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@ -750,29 +786,6 @@ msmsdcc_request(struct mmc_host *mmc, struct mmc_request *mrq)
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spin_unlock_irqrestore(&host->lock, flags);
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}
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static int inline
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msmsdcc_enable_clocks(struct msmsdcc_host *host, int enable)
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{
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int rc;
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if (enable) {
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rc = clk_enable(host->pclk);
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if (rc)
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return rc;
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rc = clk_enable(host->clk);
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if (rc) {
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clk_disable(host->pclk);
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return rc;
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}
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host->clks_on = 1;
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udelay(10);
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} else {
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clk_disable(host->clk);
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clk_disable(host->pclk);
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host->clks_on = 0;
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}
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return 0;
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}
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static void
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msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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{
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@ -782,10 +795,10 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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unsigned long flags;
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spin_lock_irqsave(&host->lock, flags);
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if (ios->clock) {
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if (!host->clks_on)
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msmsdcc_enable_clocks(host, 1);
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if (ios->clock) {
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if (ios->clock != host->clk_rate) {
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rc = clk_set_rate(host->clk, ios->clock);
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if (rc < 0)
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@ -829,8 +842,7 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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host->pwr = pwr;
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writel(pwr, host->base + MMCIPOWER);
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}
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if (!(clk & MCI_CLK_ENABLE) && host->clks_on)
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if (host->clks_on)
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msmsdcc_enable_clocks(host, 0);
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spin_unlock_irqrestore(&host->lock, flags);
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}
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@ -909,6 +921,19 @@ msmsdcc_status_notify_cb(int card_present, void *dev_id)
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msmsdcc_check_status((unsigned long) host);
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}
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static void
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msmsdcc_busclk_expired(unsigned long _data)
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{
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struct msmsdcc_host *host = (struct msmsdcc_host *) _data;
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unsigned long flags;
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spin_lock_irqsave(&host->lock, flags);
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if (host->clks_on)
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msmsdcc_enable_clocks(host, 0);
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spin_unlock_irqrestore(&host->lock, flags);
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}
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/*
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* called when a command expires.
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* Dump some debugging, and then error
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@ -942,6 +967,8 @@ msmsdcc_command_expired(unsigned long _data)
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host->curr.mrq = NULL;
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host->curr.cmd = NULL;
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if (host->clks_on)
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msmsdcc_enable_clocks(host, 0);
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spin_unlock_irqrestore(&host->lock, flags);
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mmc_request_done(host->mmc, mrq);
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}
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@ -1048,6 +1075,8 @@ msmsdcc_probe(struct platform_device *pdev)
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host->cmdpoll = 1;
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host->use_bustimer = 1;
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host->base = ioremap(memres->start, PAGE_SIZE);
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if (!host->base) {
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ret = -ENOMEM;
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@ -1167,6 +1196,10 @@ msmsdcc_probe(struct platform_device *pdev)
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host->command_timer.data = (unsigned long) host;
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host->command_timer.function = msmsdcc_command_expired;
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init_timer(&host->busclk_timer);
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host->busclk_timer.data = (unsigned long) host;
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host->busclk_timer.function = msmsdcc_busclk_expired;
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ret = request_irq(cmd_irqres->start, msmsdcc_irq, IRQF_SHARED,
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DRIVER_NAME " (cmd)", host);
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if (ret)
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@ -214,6 +214,8 @@ struct msmsdcc_host {
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struct clk *pclk; /* SDCC peripheral bus clock */
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unsigned int clks_on; /* set if clocks are enabled */
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struct timer_list command_timer;
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struct timer_list busclk_timer;
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int use_bustimer;
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unsigned int eject; /* eject state */
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