mmc: sdhci: Do not use spin lock in set_ios paths
The spin lock is not necessary in set_ios. Anything that is racing with changes to the I/O state is already broken. The mmc core already provides synchronization via "claiming" the host. So remove spin_lock and friends from sdhci_set_ios and related callbacks. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Ludovic Desroches <ludovic.desroches@microchip.com>
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@ -991,12 +991,8 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
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mmc_hostname(host->mmc), host->clock, uhs, ctrl_2);
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sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
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spin_unlock_irq(&host->lock);
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if (mmc->ios.timing == MMC_TIMING_MMC_HS400)
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sdhci_msm_hs400(host, &mmc->ios);
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spin_lock_irq(&host->lock);
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}
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static void sdhci_msm_voltage_switch(struct sdhci_host *host)
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@ -1089,13 +1085,9 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
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goto out;
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}
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spin_unlock_irq(&host->lock);
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sdhci_msm_hc_select_mode(host);
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msm_set_clock_rate_for_bus_mode(host, clock);
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spin_lock_irq(&host->lock);
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out:
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__sdhci_msm_set_clock(host, clock);
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}
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@ -194,9 +194,7 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
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* through low speeds without power cycling.
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*/
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sdhci_set_clock(host, host->max_clk);
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spin_unlock_irq(&host->lock);
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phy_power_on(sdhci_arasan->phy);
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spin_lock_irq(&host->lock);
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sdhci_arasan->is_phy_on = true;
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/*
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@ -215,18 +213,14 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
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}
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if (ctrl_phy && sdhci_arasan->is_phy_on) {
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spin_unlock_irq(&host->lock);
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phy_power_off(sdhci_arasan->phy);
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spin_lock_irq(&host->lock);
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sdhci_arasan->is_phy_on = false;
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}
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sdhci_set_clock(host, clock);
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if (ctrl_phy) {
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spin_unlock_irq(&host->lock);
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phy_power_on(sdhci_arasan->phy);
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spin_lock_irq(&host->lock);
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sdhci_arasan->is_phy_on = true;
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}
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}
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@ -98,9 +98,7 @@ static void sdhci_at91_set_power(struct sdhci_host *host, unsigned char mode,
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if (!IS_ERR(host->mmc->supply.vmmc)) {
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struct mmc_host *mmc = host->mmc;
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spin_unlock_irq(&host->lock);
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mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
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spin_lock_irq(&host->lock);
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}
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sdhci_set_power_noreg(host, mode, vdd);
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}
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@ -484,8 +484,6 @@ static void sdhci_intel_set_power(struct sdhci_host *host, unsigned char mode,
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if (mode == MMC_POWER_OFF)
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return;
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spin_unlock_irq(&host->lock);
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/*
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* Bus power might not enable after D3 -> D0 transition due to the
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* present state not yet having propagated. Retry for up to 2ms.
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@ -498,8 +496,6 @@ static void sdhci_intel_set_power(struct sdhci_host *host, unsigned char mode,
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reg |= SDHCI_POWER_ON;
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sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
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}
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spin_lock_irq(&host->lock);
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}
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static const struct sdhci_ops sdhci_intel_byt_ops = {
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@ -323,11 +323,8 @@ static void pxav3_set_power(struct sdhci_host *host, unsigned char mode,
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if (host->pwr == 0)
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vdd = 0;
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if (!IS_ERR(mmc->supply.vmmc)) {
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spin_unlock_irq(&host->lock);
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if (!IS_ERR(mmc->supply.vmmc))
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mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
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spin_lock_irq(&host->lock);
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}
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}
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static const struct sdhci_ops pxav3_sdhci_ops = {
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@ -190,9 +190,7 @@ static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
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* speed possible with selected clock source and skip the division.
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*/
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if (ourhost->no_divider) {
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spin_unlock_irq(&ourhost->host->lock);
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rate = clk_round_rate(clksrc, wanted);
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spin_lock_irq(&ourhost->host->lock);
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return wanted - rate;
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}
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@ -389,9 +387,7 @@ static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
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clk &= ~SDHCI_CLOCK_CARD_EN;
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sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
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spin_unlock_irq(&host->lock);
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ret = clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
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spin_lock_irq(&host->lock);
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if (ret != 0) {
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dev_err(dev, "%s: failed to set clock rate %uHz\n",
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mmc_hostname(host->mmc), clock);
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@ -1361,9 +1361,7 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
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sdhci_dumpregs(host);
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return;
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}
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spin_unlock_irq(&host->lock);
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udelay(10);
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spin_lock_irq(&host->lock);
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}
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clk |= SDHCI_CLOCK_CARD_EN;
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@ -1392,9 +1390,7 @@ static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
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{
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struct mmc_host *mmc = host->mmc;
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spin_unlock_irq(&host->lock);
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mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
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spin_lock_irq(&host->lock);
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if (mode != MMC_POWER_OFF)
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sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
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@ -1574,16 +1570,12 @@ EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
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static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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{
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struct sdhci_host *host = mmc_priv(mmc);
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unsigned long flags;
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u8 ctrl;
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if (ios->power_mode == MMC_POWER_UNDEFINED)
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return;
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spin_lock_irqsave(&host->lock, flags);
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if (host->flags & SDHCI_DEVICE_DEAD) {
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spin_unlock_irqrestore(&host->lock, flags);
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if (!IS_ERR(mmc->supply.vmmc) &&
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ios->power_mode == MMC_POWER_OFF)
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mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
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@ -1729,7 +1721,6 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
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mmiowb();
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spin_unlock_irqrestore(&host->lock, flags);
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}
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static int sdhci_get_cd(struct mmc_host *mmc)
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