These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

1 files changed, 84 insertions, 239 deletions

diff --git a/kernel/drivers/mmc/core/host.c b/kernel/drivers/mmc/core/host.c
index 8be0df758..da950c442 100644
--- a/kernel/drivers/mmc/core/host.c
+++ b/kernel/drivers/mmc/core/host.c
@@ -61,245 +61,89 @@ void mmc_unregister_host_class(void)
 	class_unregister(&mmc_host_class);
 }
 
-#ifdef CONFIG_MMC_CLKGATE
-static ssize_t clkgate_delay_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
+void mmc_retune_enable(struct mmc_host *host)
 {
-	struct mmc_host *host = cls_dev_to_mmc_host(dev);
-	return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay);
+	host->can_retune = 1;
+	if (host->retune_period)
+		mod_timer(&host->retune_timer,
+			  jiffies + host->retune_period * HZ);
 }
 
-static ssize_t clkgate_delay_store(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t count)
+void mmc_retune_disable(struct mmc_host *host)
 {
-	struct mmc_host *host = cls_dev_to_mmc_host(dev);
-	unsigned long flags, value;
-
-	if (kstrtoul(buf, 0, &value))
-		return -EINVAL;
-
-	spin_lock_irqsave(&host->clk_lock, flags);
-	host->clkgate_delay = value;
-	spin_unlock_irqrestore(&host->clk_lock, flags);
-	return count;
+	host->can_retune = 0;
+	del_timer_sync(&host->retune_timer);
+	host->retune_now = 0;
+	host->need_retune = 0;
 }
 
-/*
- * Enabling clock gating will make the core call out to the host
- * once up and once down when it performs a request or card operation
- * intermingled in any fashion. The driver will see this through
- * set_ios() operations with ios.clock field set to 0 to gate (disable)
- * the block clock, and to the old frequency to enable it again.
- */
-static void mmc_host_clk_gate_delayed(struct mmc_host *host)
+void mmc_retune_timer_stop(struct mmc_host *host)
 {
-	unsigned long tick_ns;
-	unsigned long freq = host->ios.clock;
-	unsigned long flags;
-
-	if (!freq) {
-		pr_debug("%s: frequency set to 0 in disable function, "
-			 "this means the clock is already disabled.\n",
-			 mmc_hostname(host));
-		return;
-	}
-	/*
-	 * New requests may have appeared while we were scheduling,
-	 * then there is no reason to delay the check before
-	 * clk_disable().
-	 */
-	spin_lock_irqsave(&host->clk_lock, flags);
-
-	/*
-	 * Delay n bus cycles (at least 8 from MMC spec) before attempting
-	 * to disable the MCI block clock. The reference count may have
-	 * gone up again after this delay due to rescheduling!
-	 */
-	if (!host->clk_requests) {
-		spin_unlock_irqrestore(&host->clk_lock, flags);
-		tick_ns = DIV_ROUND_UP(1000000000, freq);
-		ndelay(host->clk_delay * tick_ns);
-	} else {
-		/* New users appeared while waiting for this work */
-		spin_unlock_irqrestore(&host->clk_lock, flags);
-		return;
-	}
-	mutex_lock(&host->clk_gate_mutex);
-	spin_lock_irqsave(&host->clk_lock, flags);
-	if (!host->clk_requests) {
-		spin_unlock_irqrestore(&host->clk_lock, flags);
-		/* This will set host->ios.clock to 0 */
-		mmc_gate_clock(host);
-		spin_lock_irqsave(&host->clk_lock, flags);
-		pr_debug("%s: gated MCI clock\n", mmc_hostname(host));
-	}
-	spin_unlock_irqrestore(&host->clk_lock, flags);
-	mutex_unlock(&host->clk_gate_mutex);
+	del_timer_sync(&host->retune_timer);
 }
+EXPORT_SYMBOL(mmc_retune_timer_stop);
 
-/*
- * Internal work. Work to disable the clock at some later point.
- */
-static void mmc_host_clk_gate_work(struct work_struct *work)
+void mmc_retune_hold(struct mmc_host *host)
 {
-	struct mmc_host *host = container_of(work, struct mmc_host,
-					      clk_gate_work.work);
-
-	mmc_host_clk_gate_delayed(host);
+	if (!host->hold_retune)
+		host->retune_now = 1;
+	host->hold_retune += 1;
 }
 
-/**
- *	mmc_host_clk_hold - ungate hardware MCI clocks
- *	@host: host to ungate.
- *
- *	Makes sure the host ios.clock is restored to a non-zero value
- *	past this call.	Increase clock reference count and ungate clock
- *	if we're the first user.
- */
-void mmc_host_clk_hold(struct mmc_host *host)
+void mmc_retune_release(struct mmc_host *host)
 {
-	unsigned long flags;
-
-	/* cancel any clock gating work scheduled by mmc_host_clk_release() */
-	cancel_delayed_work_sync(&host->clk_gate_work);
-	mutex_lock(&host->clk_gate_mutex);
-	spin_lock_irqsave(&host->clk_lock, flags);
-	if (host->clk_gated) {
-		spin_unlock_irqrestore(&host->clk_lock, flags);
-		mmc_ungate_clock(host);
-		spin_lock_irqsave(&host->clk_lock, flags);
-		pr_debug("%s: ungated MCI clock\n", mmc_hostname(host));
-	}
-	host->clk_requests++;
-	spin_unlock_irqrestore(&host->clk_lock, flags);
-	mutex_unlock(&host->clk_gate_mutex);
+	if (host->hold_retune)
+		host->hold_retune -= 1;
+	else
+		WARN_ON(1);
 }
 
-/**
- *	mmc_host_may_gate_card - check if this card may be gated
- *	@card: card to check.
- */
-static bool mmc_host_may_gate_card(struct mmc_card *card)
+int mmc_retune(struct mmc_host *host)
 {
-	/* If there is no card we may gate it */
-	if (!card)
-		return true;
-	/*
-	 * Don't gate SDIO cards! These need to be clocked at all times
-	 * since they may be independent systems generating interrupts
-	 * and other events. The clock requests counter from the core will
-	 * go down to zero since the core does not need it, but we will not
-	 * gate the clock, because there is somebody out there that may still
-	 * be using it.
-	 */
-	return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING);
-}
+	bool return_to_hs400 = false;
+	int err;
 
-/**
- *	mmc_host_clk_release - gate off hardware MCI clocks
- *	@host: host to gate.
- *
- *	Calls the host driver with ios.clock set to zero as often as possible
- *	in order to gate off hardware MCI clocks. Decrease clock reference
- *	count and schedule disabling of clock.
- */
-void mmc_host_clk_release(struct mmc_host *host)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&host->clk_lock, flags);
-	host->clk_requests--;
-	if (mmc_host_may_gate_card(host->card) &&
-	    !host->clk_requests)
-		schedule_delayed_work(&host->clk_gate_work,
-				      msecs_to_jiffies(host->clkgate_delay));
-	spin_unlock_irqrestore(&host->clk_lock, flags);
-}
+	if (host->retune_now)
+		host->retune_now = 0;
+	else
+		return 0;
 
-/**
- *	mmc_host_clk_rate - get current clock frequency setting
- *	@host: host to get the clock frequency for.
- *
- *	Returns current clock frequency regardless of gating.
- */
-unsigned int mmc_host_clk_rate(struct mmc_host *host)
-{
-	unsigned long freq;
-	unsigned long flags;
+	if (!host->need_retune || host->doing_retune || !host->card)
+		return 0;
 
-	spin_lock_irqsave(&host->clk_lock, flags);
-	if (host->clk_gated)
-		freq = host->clk_old;
-	else
-		freq = host->ios.clock;
-	spin_unlock_irqrestore(&host->clk_lock, flags);
-	return freq;
-}
+	host->need_retune = 0;
 
-/**
- *	mmc_host_clk_init - set up clock gating code
- *	@host: host with potential clock to control
- */
-static inline void mmc_host_clk_init(struct mmc_host *host)
-{
-	host->clk_requests = 0;
-	/* Hold MCI clock for 8 cycles by default */
-	host->clk_delay = 8;
-	/*
-	 * Default clock gating delay is 0ms to avoid wasting power.
-	 * This value can be tuned by writing into sysfs entry.
-	 */
-	host->clkgate_delay = 0;
-	host->clk_gated = false;
-	INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work);
-	spin_lock_init(&host->clk_lock);
-	mutex_init(&host->clk_gate_mutex);
-}
+	host->doing_retune = 1;
 
-/**
- *	mmc_host_clk_exit - shut down clock gating code
- *	@host: host with potential clock to control
- */
-static inline void mmc_host_clk_exit(struct mmc_host *host)
-{
-	/*
-	 * Wait for any outstanding gate and then make sure we're
-	 * ungated before exiting.
-	 */
-	if (cancel_delayed_work_sync(&host->clk_gate_work))
-		mmc_host_clk_gate_delayed(host);
-	if (host->clk_gated)
-		mmc_host_clk_hold(host);
-	/* There should be only one user now */
-	WARN_ON(host->clk_requests > 1);
-}
+	if (host->ios.timing == MMC_TIMING_MMC_HS400) {
+		err = mmc_hs400_to_hs200(host->card);
+		if (err)
+			goto out;
 
-static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
-{
-	host->clkgate_delay_attr.show = clkgate_delay_show;
-	host->clkgate_delay_attr.store = clkgate_delay_store;
-	sysfs_attr_init(&host->clkgate_delay_attr.attr);
-	host->clkgate_delay_attr.attr.name = "clkgate_delay";
-	host->clkgate_delay_attr.attr.mode = S_IRUGO | S_IWUSR;
-	if (device_create_file(&host->class_dev, &host->clkgate_delay_attr))
-		pr_err("%s: Failed to create clkgate_delay sysfs entry\n",
-				mmc_hostname(host));
-}
-#else
+		return_to_hs400 = true;
 
-static inline void mmc_host_clk_init(struct mmc_host *host)
-{
-}
+		if (host->ops->prepare_hs400_tuning)
+			host->ops->prepare_hs400_tuning(host, &host->ios);
+	}
 
-static inline void mmc_host_clk_exit(struct mmc_host *host)
-{
+	err = mmc_execute_tuning(host->card);
+	if (err)
+		goto out;
+
+	if (return_to_hs400)
+		err = mmc_hs200_to_hs400(host->card);
+out:
+	host->doing_retune = 0;
+
+	return err;
 }
 
-static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
+static void mmc_retune_timer(unsigned long data)
 {
-}
+	struct mmc_host *host = (struct mmc_host *)data;
 
-#endif
+	mmc_retune_needed(host);
+}
 
 /**
  *	mmc_of_parse() - parse host's device-tree node
@@ -314,7 +158,7 @@ int mmc_of_parse(struct mmc_host *host)
 {
 	struct device_node *np;
 	u32 bus_width;
-	int len, ret;
+	int ret;
 	bool cd_cap_invert, cd_gpio_invert = false;
 	bool ro_cap_invert, ro_gpio_invert = false;
 
@@ -361,19 +205,19 @@ int mmc_of_parse(struct mmc_host *host)
 	 */
 
 	/* Parse Card Detection */
-	if (of_find_property(np, "non-removable", &len)) {
+	if (of_property_read_bool(np, "non-removable")) {
 		host->caps |= MMC_CAP_NONREMOVABLE;
 	} else {
 		cd_cap_invert = of_property_read_bool(np, "cd-inverted");
 
-		if (of_find_property(np, "broken-cd", &len))
+		if (of_property_read_bool(np, "broken-cd"))
 			host->caps |= MMC_CAP_NEEDS_POLL;
 
 		ret = mmc_gpiod_request_cd(host, "cd", 0, true,
 					   0, &cd_gpio_invert);
 		if (!ret)
 			dev_info(host->parent, "Got CD GPIO\n");
-		else if (ret != -ENOENT)
+		else if (ret != -ENOENT && ret != -ENOSYS)
 			return ret;
 
 		/*
@@ -397,48 +241,53 @@ int mmc_of_parse(struct mmc_host *host)
 	ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
 	if (!ret)
 		dev_info(host->parent, "Got WP GPIO\n");
-	else if (ret != -ENOENT)
+	else if (ret != -ENOENT && ret != -ENOSYS)
 		return ret;
 
+	if (of_property_read_bool(np, "disable-wp"))
+		host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
+
 	/* See the comment on CD inversion above */
 	if (ro_cap_invert ^ ro_gpio_invert)
 		host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
 
-	if (of_find_property(np, "cap-sd-highspeed", &len))
+	if (of_property_read_bool(np, "cap-sd-highspeed"))
 		host->caps |= MMC_CAP_SD_HIGHSPEED;
-	if (of_find_property(np, "cap-mmc-highspeed", &len))
+	if (of_property_read_bool(np, "cap-mmc-highspeed"))
 		host->caps |= MMC_CAP_MMC_HIGHSPEED;
-	if (of_find_property(np, "sd-uhs-sdr12", &len))
+	if (of_property_read_bool(np, "sd-uhs-sdr12"))
 		host->caps |= MMC_CAP_UHS_SDR12;
-	if (of_find_property(np, "sd-uhs-sdr25", &len))
+	if (of_property_read_bool(np, "sd-uhs-sdr25"))
 		host->caps |= MMC_CAP_UHS_SDR25;
-	if (of_find_property(np, "sd-uhs-sdr50", &len))
+	if (of_property_read_bool(np, "sd-uhs-sdr50"))
 		host->caps |= MMC_CAP_UHS_SDR50;
-	if (of_find_property(np, "sd-uhs-sdr104", &len))
+	if (of_property_read_bool(np, "sd-uhs-sdr104"))
 		host->caps |= MMC_CAP_UHS_SDR104;
-	if (of_find_property(np, "sd-uhs-ddr50", &len))
+	if (of_property_read_bool(np, "sd-uhs-ddr50"))
 		host->caps |= MMC_CAP_UHS_DDR50;
-	if (of_find_property(np, "cap-power-off-card", &len))
+	if (of_property_read_bool(np, "cap-power-off-card"))
 		host->caps |= MMC_CAP_POWER_OFF_CARD;
-	if (of_find_property(np, "cap-sdio-irq", &len))
+	if (of_property_read_bool(np, "cap-mmc-hw-reset"))
+		host->caps |= MMC_CAP_HW_RESET;
+	if (of_property_read_bool(np, "cap-sdio-irq"))
 		host->caps |= MMC_CAP_SDIO_IRQ;
-	if (of_find_property(np, "full-pwr-cycle", &len))
+	if (of_property_read_bool(np, "full-pwr-cycle"))
 		host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
-	if (of_find_property(np, "keep-power-in-suspend", &len))
+	if (of_property_read_bool(np, "keep-power-in-suspend"))
 		host->pm_caps |= MMC_PM_KEEP_POWER;
-	if (of_find_property(np, "enable-sdio-wakeup", &len))
+	if (of_property_read_bool(np, "enable-sdio-wakeup"))
 		host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
-	if (of_find_property(np, "mmc-ddr-1_8v", &len))
+	if (of_property_read_bool(np, "mmc-ddr-1_8v"))
 		host->caps |= MMC_CAP_1_8V_DDR;
-	if (of_find_property(np, "mmc-ddr-1_2v", &len))
+	if (of_property_read_bool(np, "mmc-ddr-1_2v"))
 		host->caps |= MMC_CAP_1_2V_DDR;
-	if (of_find_property(np, "mmc-hs200-1_8v", &len))
+	if (of_property_read_bool(np, "mmc-hs200-1_8v"))
 		host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
-	if (of_find_property(np, "mmc-hs200-1_2v", &len))
+	if (of_property_read_bool(np, "mmc-hs200-1_2v"))
 		host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
-	if (of_find_property(np, "mmc-hs400-1_8v", &len))
+	if (of_property_read_bool(np, "mmc-hs400-1_8v"))
 		host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
-	if (of_find_property(np, "mmc-hs400-1_2v", &len))
+	if (of_property_read_bool(np, "mmc-hs400-1_2v"))
 		host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
 
 	host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
@@ -496,14 +345,13 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
 		return NULL;
 	}
 
-	mmc_host_clk_init(host);
-
 	spin_lock_init(&host->lock);
 	init_waitqueue_head(&host->wq);
 	INIT_DELAYED_WORK(&host->detect, mmc_rescan);
 #ifdef CONFIG_PM
 	host->pm_notify.notifier_call = mmc_pm_notify;
 #endif
+	setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
 
 	/*
 	 * By default, hosts do not support SGIO or large requests.
@@ -545,7 +393,6 @@ int mmc_add_host(struct mmc_host *host)
 #ifdef CONFIG_DEBUG_FS
 	mmc_add_host_debugfs(host);
 #endif
-	mmc_host_clk_sysfs_init(host);
 
 	mmc_start_host(host);
 	register_pm_notifier(&host->pm_notify);
@@ -575,8 +422,6 @@ void mmc_remove_host(struct mmc_host *host)
 	device_del(&host->class_dev);
 
 	led_trigger_unregister_simple(host->led);
-
-	mmc_host_clk_exit(host);
 }
 
 EXPORT_SYMBOL(mmc_remove_host);