Merge tag 'hsi-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-hsi

Pull HSI updates from Sebastian Reichel:

 - proper runtime pm support for omap-ssi and ssi-protocol

 - misc fixes

* tag 'hsi-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-hsi: (24 commits)
  HSI: omap_ssi: drop pm_runtime_irq_safe
  HSI: omap_ssi_port: use rpm autosuspend API
  HSI: omap_ssi: call msg->complete() from process context
  HSI: omap_ssi_port: ensure clocks are kept enabled during transfer
  HSI: omap_ssi_port: replace pm_runtime_put_sync with non-sync variant
  HSI: omap_ssi_port: avoid calling runtime_pm_*_sync inside spinlock
  HSI: omap_ssi_port: avoid pm_runtime_get_sync in ssi_start_dma and ssi_start_pio
  HSI: omap_ssi_port: switch to threaded pio irq
  HSI: omap_ssi_core: remove pm_runtime_get_sync call from tasklet
  HSI: omap_ssi_core: use pm_runtime_put instead of pm_runtime_put_sync
  HSI: omap_ssi_port: prepare start_tx/stop_tx for blocking pm_runtime calls
  HSI: core: switch port event notifier from atomic to blocking
  HSI: omap_ssi_port: replace wkin_cken with atomic bitmap operations
  HSI: omap_ssi: convert cawake irq handler to thread
  HSI: ssi_protocol: fix ssip_xmit invocation
  HSI: ssi_protocol: replace spin_lock with spin_lock_bh
  HSI: ssi_protocol: avoid ssi_waketest call with held spinlock
  HSI: omap_ssi: do not reset module
  HSI: omap_ssi_port: remove useless newline
  hsi: Only descend into hsi directory when CONFIG_HSI is set
  ...

Documentation/DocBook/device-drivers.tmpl

@@ -484,7 +484,7 @@ X!Ilib/fonts/fonts.c
      </para>
 
 !Iinclude/linux/hsi/hsi.h
-!Edrivers/hsi/hsi.c
+!Edrivers/hsi/hsi_core.c
   </chapter>
 
   <chapter id="pwm">

drivers/Makefile

@@ -78,7 +78,7 @@ obj-$(CONFIG_TARGET_CORE)	+= target/
 obj-$(CONFIG_MTD)		+= mtd/
 obj-$(CONFIG_SPI)		+= spi/
 obj-$(CONFIG_SPMI)		+= spmi/
-obj-y				+= hsi/
+obj-$(CONFIG_HSI)		+= hsi/
 obj-y				+= net/
 obj-$(CONFIG_ATM)		+= atm/
 obj-$(CONFIG_FUSION)		+= message/

drivers/hsi/Makefile

 #
 # Makefile for HSI
 #
-obj-$(CONFIG_HSI_BOARDINFO)	+= hsi_boardinfo.o
 obj-$(CONFIG_HSI)		+= hsi.o
+hsi-objs			:= hsi_core.o
+hsi-$(CONFIG_HSI_BOARDINFO)	+= hsi_boardinfo.o
 obj-y				+= controllers/
 obj-y				+= clients/

drivers/hsi/clients/cmt_speech.c

@@ -444,8 +444,8 @@ static void cs_hsi_read_on_control_complete(struct hsi_msg *msg)
 	hi->control_state &= ~SSI_CHANNEL_STATE_READING;
 	if (msg->status == HSI_STATUS_ERROR) {
 		dev_err(&hi->cl->device, "Control RX error detected\n");
-		cs_hsi_control_read_error(hi, msg);
 		spin_unlock(&hi->lock);
+		cs_hsi_control_read_error(hi, msg);
 		goto out;
 	}
 	dev_dbg(&hi->cl->device, "Read on control: %08X\n", cmd);
@@ -1275,7 +1275,7 @@ static int cs_char_mmap(struct file *file, struct vm_area_struct *vma)
 	if (vma->vm_end < vma->vm_start)
 		return -EINVAL;
 
-	if (((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) != 1)
+	if (vma_pages(vma) != 1)
 		return -EINVAL;
 
 	vma->vm_flags |= VM_IO | VM_DONTDUMP | VM_DONTEXPAND;

drivers/hsi/clients/ssi_protocol.c

@@ -88,6 +88,8 @@ void ssi_waketest(struct hsi_client *cl, unsigned int enable);
 #define SSIP_READY_CMD		SSIP_CMD(SSIP_READY, 0)
 #define SSIP_SWBREAK_CMD	SSIP_CMD(SSIP_SW_BREAK, 0)
 
+#define SSIP_WAKETEST_FLAG 0
+
 /* Main state machine states */
 enum {
 	INIT,
@@ -116,7 +118,7 @@ enum {
  * @main_state: Main state machine
  * @send_state: TX state machine
  * @recv_state: RX state machine
- * @waketest: Flag to follow wake line test
+ * @flags: Flags, currently only used to follow wake line test
  * @rxid: RX data id
  * @txid: TX data id
  * @txqueue_len: TX queue length
@@ -137,7 +139,7 @@ struct ssi_protocol {
 	unsigned int		main_state;
 	unsigned int		send_state;
 	unsigned int		recv_state;
-	unsigned int		waketest:1;
+	unsigned long		flags;
 	u8			rxid;
 	u8			txid;
 	unsigned int		txqueue_len;
@@ -148,6 +150,7 @@ struct ssi_protocol {
 	struct net_device	*netdev;
 	struct list_head	txqueue;
 	struct list_head	cmdqueue;
+	struct work_struct	work;
 	struct hsi_client	*cl;
 	struct list_head	link;
 	atomic_t		tx_usecnt;
@@ -405,15 +408,17 @@ static void ssip_reset(struct hsi_client *cl)
 	spin_lock_bh(&ssi->lock);
 	if (ssi->send_state != SEND_IDLE)
 		hsi_stop_tx(cl);
-	if (ssi->waketest)
-		ssi_waketest(cl, 0);
+	spin_unlock_bh(&ssi->lock);
+	if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
+		ssi_waketest(cl, 0); /* FIXME: To be removed */
+	spin_lock_bh(&ssi->lock);
 	del_timer(&ssi->rx_wd);
 	del_timer(&ssi->tx_wd);
 	del_timer(&ssi->keep_alive);
 	ssi->main_state = 0;
 	ssi->send_state = 0;
 	ssi->recv_state = 0;
-	ssi->waketest = 0;
+	ssi->flags = 0;
 	ssi->rxid = 0;
 	ssi->txid = 0;
 	list_for_each_safe(head, tmp, &ssi->txqueue) {
@@ -437,7 +442,8 @@ static void ssip_dump_state(struct hsi_client *cl)
 	dev_err(&cl->device, "Send state: %d\n", ssi->send_state);
 	dev_err(&cl->device, "CMT %s\n", (ssi->main_state == ACTIVE) ?
 							"Online" : "Offline");
-	dev_err(&cl->device, "Wake test %d\n", ssi->waketest);
+	dev_err(&cl->device, "Wake test %d\n",
+				test_bit(SSIP_WAKETEST_FLAG, &ssi->flags));
 	dev_err(&cl->device, "Data RX id: %d\n", ssi->rxid);
 	dev_err(&cl->device, "Data TX id: %d\n", ssi->txid);
 
@@ -515,17 +521,17 @@ static void ssip_start_rx(struct hsi_client *cl)
 
 	dev_dbg(&cl->device, "RX start M(%d) R(%d)\n", ssi->main_state,
 						ssi->recv_state);
-	spin_lock(&ssi->lock);
+	spin_lock_bh(&ssi->lock);
 	/*
 	 * We can have two UP events in a row due to a short low
 	 * high transition. Therefore we need to ignore the sencond UP event.
 	 */
 	if ((ssi->main_state != ACTIVE) || (ssi->recv_state == RECV_READY)) {
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		return;
 	}
 	ssip_set_rxstate(ssi, RECV_READY);
-	spin_unlock(&ssi->lock);
+	spin_unlock_bh(&ssi->lock);
 
 	msg = ssip_claim_cmd(ssi);
 	ssip_set_cmd(msg, SSIP_READY_CMD);
@@ -539,10 +545,10 @@ static void ssip_stop_rx(struct hsi_client *cl)
 	struct ssi_protocol *ssi = hsi_client_drvdata(cl);
 
 	dev_dbg(&cl->device, "RX stop M(%d)\n", ssi->main_state);
-	spin_lock(&ssi->lock);
+	spin_lock_bh(&ssi->lock);
 	if (likely(ssi->main_state == ACTIVE))
 		ssip_set_rxstate(ssi, RECV_IDLE);
-	spin_unlock(&ssi->lock);
+	spin_unlock_bh(&ssi->lock);
 }
 
 static void ssip_free_strans(struct hsi_msg *msg)
@@ -559,9 +565,9 @@ static void ssip_strans_complete(struct hsi_msg *msg)
 
 	data = msg->context;
 	ssip_release_cmd(msg);
-	spin_lock(&ssi->lock);
+	spin_lock_bh(&ssi->lock);
 	ssip_set_txstate(ssi, SENDING);
-	spin_unlock(&ssi->lock);
+	spin_unlock_bh(&ssi->lock);
 	hsi_async_write(cl, data);
 }
 
@@ -666,15 +672,17 @@ static void ssip_rx_bootinforeq(struct hsi_client *cl, u32 cmd)
 		/* Fall through */
 	case INIT:
 	case HANDSHAKE:
-		spin_lock(&ssi->lock);
+		spin_lock_bh(&ssi->lock);
 		ssi->main_state = HANDSHAKE;
-		if (!ssi->waketest) {
-			ssi->waketest = 1;
+		spin_unlock_bh(&ssi->lock);
+
+		if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
 			ssi_waketest(cl, 1); /* FIXME: To be removed */
-		}
+
+		spin_lock_bh(&ssi->lock);
 		/* Start boot handshake watchdog */
 		mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		dev_dbg(&cl->device, "Send BOOTINFO_RESP\n");
 		if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
 			dev_warn(&cl->device, "boot info req verid mismatch\n");
@@ -696,14 +704,14 @@ static void ssip_rx_bootinforesp(struct hsi_client *cl, u32 cmd)
 	if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
 		dev_warn(&cl->device, "boot info resp verid mismatch\n");
 
-	spin_lock(&ssi->lock);
+	spin_lock_bh(&ssi->lock);
 	if (ssi->main_state != ACTIVE)
 		/* Use tx_wd as a boot watchdog in non ACTIVE state */
 		mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
 	else
 		dev_dbg(&cl->device, "boot info resp ignored M(%d)\n",
 							ssi->main_state);
-	spin_unlock(&ssi->lock);
+	spin_unlock_bh(&ssi->lock);
 }
 
 static void ssip_rx_waketest(struct hsi_client *cl, u32 cmd)
@@ -711,20 +719,22 @@ static void ssip_rx_waketest(struct hsi_client *cl, u32 cmd)
 	struct ssi_protocol *ssi = hsi_client_drvdata(cl);
 	unsigned int wkres = SSIP_PAYLOAD(cmd);
 
-	spin_lock(&ssi->lock);
+	spin_lock_bh(&ssi->lock);
 	if (ssi->main_state != HANDSHAKE) {
 		dev_dbg(&cl->device, "wake lines test ignored M(%d)\n",
 							ssi->main_state);
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		return;
 	}
-	if (ssi->waketest) {
-		ssi->waketest = 0;
+	spin_unlock_bh(&ssi->lock);
+
+	if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
 		ssi_waketest(cl, 0); /* FIXME: To be removed */
-	}
+
+	spin_lock_bh(&ssi->lock);
 	ssi->main_state = ACTIVE;
 	del_timer(&ssi->tx_wd); /* Stop boot handshake timer */
-	spin_unlock(&ssi->lock);
+	spin_unlock_bh(&ssi->lock);
 
 	dev_notice(&cl->device, "WAKELINES TEST %s\n",
 				wkres & SSIP_WAKETEST_FAILED ? "FAILED" : "OK");
@@ -741,20 +751,20 @@ static void ssip_rx_ready(struct hsi_client *cl)
 {
 	struct ssi_protocol *ssi = hsi_client_drvdata(cl);
 
-	spin_lock(&ssi->lock);
+	spin_lock_bh(&ssi->lock);
 	if (unlikely(ssi->main_state != ACTIVE)) {
 		dev_dbg(&cl->device, "READY on wrong state: S(%d) M(%d)\n",
 					ssi->send_state, ssi->main_state);
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		return;
 	}
 	if (ssi->send_state != WAIT4READY) {
 		dev_dbg(&cl->device, "Ignore spurious READY command\n");
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		return;
 	}
 	ssip_set_txstate(ssi, SEND_READY);
-	spin_unlock(&ssi->lock);
+	spin_unlock_bh(&ssi->lock);
 	ssip_xmit(cl);
 }
 
@@ -766,22 +776,22 @@ static void ssip_rx_strans(struct hsi_client *cl, u32 cmd)
 	int len = SSIP_PDU_LENGTH(cmd);
 
 	dev_dbg(&cl->device, "RX strans: %d frames\n", len);
-	spin_lock(&ssi->lock);
+	spin_lock_bh(&ssi->lock);
 	if (unlikely(ssi->main_state != ACTIVE)) {
 		dev_err(&cl->device, "START TRANS wrong state: S(%d) M(%d)\n",
 					ssi->send_state, ssi->main_state);
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		return;
 	}
 	ssip_set_rxstate(ssi, RECEIVING);
 	if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) {
 		dev_err(&cl->device, "START TRANS id %d expected %d\n",
 					SSIP_MSG_ID(cmd), ssi->rxid);
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		goto out1;
 	}
 	ssi->rxid++;
-	spin_unlock(&ssi->lock);
+	spin_unlock_bh(&ssi->lock);
 	skb = netdev_alloc_skb(ssi->netdev, len * 4);
 	if (unlikely(!skb)) {
 		dev_err(&cl->device, "No memory for rx skb\n");
@@ -849,7 +859,7 @@ static void ssip_swbreak_complete(struct hsi_msg *msg)
 	struct ssi_protocol *ssi = hsi_client_drvdata(cl);
 
 	ssip_release_cmd(msg);
-	spin_lock(&ssi->lock);
+	spin_lock_bh(&ssi->lock);
 	if (list_empty(&ssi->txqueue)) {
 		if (atomic_read(&ssi->tx_usecnt)) {
 			ssip_set_txstate(ssi, SEND_READY);
@@ -857,9 +867,9 @@ static void ssip_swbreak_complete(struct hsi_msg *msg)
 			ssip_set_txstate(ssi, SEND_IDLE);
 			hsi_stop_tx(cl);
 		}
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 	} else {
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		ssip_xmit(cl);
 	}
 	netif_wake_queue(ssi->netdev);
@@ -876,17 +886,17 @@ static void ssip_tx_data_complete(struct hsi_msg *msg)
 		ssip_error(cl);
 		goto out;
 	}
-	spin_lock(&ssi->lock);
+	spin_lock_bh(&ssi->lock);
 	if (list_empty(&ssi->txqueue)) {
 		ssip_set_txstate(ssi, SENDING_SWBREAK);
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		cmsg = ssip_claim_cmd(ssi);
 		ssip_set_cmd(cmsg, SSIP_SWBREAK_CMD);
 		cmsg->complete = ssip_swbreak_complete;
 		dev_dbg(&cl->device, "Send SWBREAK\n");
 		hsi_async_write(cl, cmsg);
 	} else {
-		spin_unlock(&ssi->lock);
+		spin_unlock_bh(&ssi->lock);
 		ssip_xmit(cl);
 	}
 out:
@@ -926,11 +936,11 @@ static int ssip_pn_open(struct net_device *dev)
 	}
 	dev_dbg(&cl->device, "Configuring SSI port\n");
 	hsi_setup(cl);
-	spin_lock_bh(&ssi->lock);
-	if (!ssi->waketest) {
-		ssi->waketest = 1;
+
+	if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
 		ssi_waketest(cl, 1); /* FIXME: To be removed */
-	}
+
+	spin_lock_bh(&ssi->lock);
 	ssi->main_state = HANDSHAKE;
 	spin_unlock_bh(&ssi->lock);
 
@@ -959,6 +969,15 @@ static int ssip_pn_set_mtu(struct net_device *dev, int new_mtu)
 	return 0;
 }
 
+static void ssip_xmit_work(struct work_struct *work)
+{
+	struct ssi_protocol *ssi =
+				container_of(work, struct ssi_protocol, work);
+	struct hsi_client *cl = ssi->cl;
+
+	ssip_xmit(cl);
+}
+
 static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct hsi_client *cl = to_hsi_client(dev->dev.parent);
@@ -1011,7 +1030,7 @@ static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
 		dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n",
 							ssi->txqueue_len);
 		spin_unlock_bh(&ssi->lock);
-		ssip_xmit(cl);
+		schedule_work(&ssi->work);
 	} else {
 		spin_unlock_bh(&ssi->lock);
 	}
@@ -1088,6 +1107,7 @@ static int ssi_protocol_probe(struct device *dev)
 	atomic_set(&ssi->tx_usecnt, 0);
 	hsi_client_set_drvdata(cl, ssi);
 	ssi->cl = cl;
+	INIT_WORK(&ssi->work, ssip_xmit_work);
 
 	ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control");
 	if (ssi->channel_id_cmd < 0) {

drivers/hsi/controllers/omap_ssi.h

@@ -35,6 +35,8 @@
 #define SSI_MAX_GDD_LCH		8
 #define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
 
+#define SSI_WAKE_EN 0
+
 /**
  * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context
  * @mode: Bit transmission mode
@@ -71,13 +73,14 @@ struct omap_ssm_ctx {
  * @txqueue: TX message queues
  * @rxqueue: RX message queues
  * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)
+ * @errqueue: Queue for failed messages
+ * @errqueue_work: Delayed Work for failed messages
  * @irq: IRQ number
  * @wake_irq: IRQ number for incoming wake line (-1 if none)
  * @wake_gpio: GPIO number for incoming wake line (-1 if none)
- * @pio_tasklet: Bottom half for PIO transfers and events
- * @wake_tasklet: Bottom half for incoming wake events
- * @wkin_cken: Keep track of clock references due to the incoming wake line
+ * @flags: flags to keep track of states
  * @wk_refcount: Reference count for output wake line
+ * @work: worker for starting TX
  * @sys_mpu_enable: Context for the interrupt enable register for irq 0
  * @sst: Context for the synchronous serial transmitter
  * @ssr: Context for the synchronous serial receiver
@@ -95,14 +98,15 @@ struct omap_ssi_port {
 	struct list_head	txqueue[SSI_MAX_CHANNELS];
 	struct list_head	rxqueue[SSI_MAX_CHANNELS];
 	struct list_head	brkqueue;
+	struct list_head	errqueue;
+	struct delayed_work	errqueue_work;
 	unsigned int		irq;
 	int			wake_irq;
 	struct gpio_desc	*wake_gpio;
-	struct tasklet_struct	pio_tasklet;
-	struct tasklet_struct	wake_tasklet;
 	bool			wktest:1; /* FIXME: HACK to be removed */
-	bool			wkin_cken:1; /* Workaround */
+	unsigned long		flags;
 	unsigned int		wk_refcount;
+	struct work_struct	work;
 	/* OMAP SSI port context */
 	u32			sys_mpu_enable; /* We use only one irq */
 	struct omap_ssm_ctx	sst;
@@ -138,7 +142,6 @@ struct gdd_trn {
  * @fck_rate: clock rate
  * @loss_count: To follow if we need to restore context or not
  * @max_speed: Maximum TX speed (Kb/s) set by the clients.
- * @sysconfig: SSI controller saved context
  * @gdd_gcr: SSI GDD saved context
  * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any
  * @port: Array of pointers of the ports of the controller
@@ -158,7 +161,6 @@ struct omap_ssi_controller {
 	u32			loss_count;
 	u32			max_speed;
 	/* OMAP SSI Controller context */
-	u32			sysconfig;
 	u32			gdd_gcr;
 	int			(*get_loss)(struct device *dev);
 	struct omap_ssi_port	**port;

drivers/hsi/controllers/omap_ssi_core.c

@@ -58,7 +58,7 @@ static int ssi_debug_show(struct seq_file *m, void *p __maybe_unused)
 	seq_printf(m, "REVISION\t: 0x%08x\n",  readl(sys + SSI_REVISION_REG));
 	seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG));
 	seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG));
-	pm_runtime_put_sync(ssi->device.parent);
+	pm_runtime_put(ssi->device.parent);
 
 	return 0;
 }
@@ -112,7 +112,7 @@ static int ssi_debug_gdd_show(struct seq_file *m, void *p __maybe_unused)
 				readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch)));
 	}
 
-	pm_runtime_put_sync(ssi->device.parent);
+	pm_runtime_put(ssi->device.parent);
 
 	return 0;
 }
@@ -193,7 +193,7 @@ void ssi_waketest(struct hsi_client *cl, unsigned int enable)
 	} else {
 		writel_relaxed(SSI_WAKE(0),
 				omap_ssi->sys +	SSI_CLEAR_WAKE_REG(port->num));
-		pm_runtime_put_sync(ssi->device.parent);
+		pm_runtime_put(ssi->device.parent);
 	}
 }
 EXPORT_SYMBOL_GPL(ssi_waketest);
@@ -217,7 +217,7 @@ static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
 	if (msg->ttype == HSI_MSG_READ) {
 		dir = DMA_FROM_DEVICE;
 		val = SSI_DATAAVAILABLE(msg->channel);
-		pm_runtime_put_sync(ssi->device.parent);
+		pm_runtime_put(omap_port->pdev);
 	} else {
 		dir = DMA_TO_DEVICE;
 		val = SSI_DATAACCEPT(msg->channel);
@@ -235,7 +235,9 @@ static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
 		spin_lock(&omap_port->lock);
 		list_del(&msg->link); /* Dequeue msg */
 		spin_unlock(&omap_port->lock);
-		msg->complete(msg);
+
+		list_add_tail(&msg->link, &omap_port->errqueue);
+		schedule_delayed_work(&omap_port->errqueue_work, 0);
 		return;
 	}
 	spin_lock(&omap_port->lock);
@@ -255,7 +257,13 @@ static void ssi_gdd_tasklet(unsigned long dev)
 	unsigned int lch;
 	u32 status_reg;
 
-	pm_runtime_get_sync(ssi->device.parent);
+	pm_runtime_get(ssi->device.parent);
+
+	if (!pm_runtime_active(ssi->device.parent)) {
+		dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n");
+		pm_runtime_put(ssi->device.parent);
+		return;
+	}
 
 	status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
 	for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
@@ -265,7 +273,7 @@ static void ssi_gdd_tasklet(unsigned long dev)
 	writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG);
 	status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
 
-	pm_runtime_put_sync(ssi->device.parent);
+	pm_runtime_put(ssi->device.parent);
 
 	if (status_reg)
 		tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
@@ -312,7 +320,7 @@ static int ssi_clk_event(struct notifier_block *nb, unsigned long event,
 				continue;
 
 			/* Workaround for SWBREAK + CAwake down race in CMT */
-			tasklet_disable(&omap_port->wake_tasklet);
+			disable_irq(omap_port->wake_irq);
 
 			/* stop all ssi communication */
 			pinctrl_pm_select_idle_state(omap_port->pdev);
@@ -338,7 +346,7 @@ static int ssi_clk_event(struct notifier_block *nb, unsigned long event,
 
 			/* resume ssi communication */
 			pinctrl_pm_select_default_state(omap_port->pdev);
-			tasklet_enable(&omap_port->wake_tasklet);
+			enable_irq(omap_port->wake_irq);
 		}
 
 		break;
@@ -452,8 +460,6 @@ static int ssi_add_controller(struct hsi_controller *ssi,
 static int ssi_hw_init(struct hsi_controller *ssi)
 {
 	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
-	unsigned int i;
-	u32 val;
 	int err;
 
 	err = pm_runtime_get_sync(ssi->device.parent);
@@ -461,27 +467,12 @@ static int ssi_hw_init(struct hsi_controller *ssi)
 		dev_err(&ssi->device, "runtime PM failed %d\n", err);
 		return err;
 	}
-	/* Reseting SSI controller */
-	writel_relaxed(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG);
-	val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
-	for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) {
-		msleep(20);
-		val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
-	}
-	if (!(val & SSI_RESETDONE)) {
-		dev_err(&ssi->device, "SSI HW reset failed\n");
-		pm_runtime_put_sync(ssi->device.parent);
-		return -EIO;
-	}
 	/* Reseting GDD */
 	writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG);
 	/* Get FCK rate in KHz */
 	omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000);
 	dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate);
-	/* Set default PM settings */
-	val = SSI_AUTOIDLE | SSI_SIDLEMODE_SMART | SSI_MIDLEMODE_SMART;
-	writel_relaxed(val, omap_ssi->sys + SSI_SYSCONFIG_REG);
-	omap_ssi->sysconfig = val;
+
 	writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG);
 	omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON;
 	pm_runtime_put_sync(ssi->device.parent);
@@ -552,7 +543,6 @@ static int ssi_probe(struct platform_device *pd)
 	if (err < 0)
 		goto out1;
 
-	pm_runtime_irq_safe(&pd->dev);
 	pm_runtime_enable(&pd->dev);
 
 	err = ssi_hw_init(ssi);

drivers/hsi/hsi.c → drivers/hsi/hsi_core.c

@@ -90,19 +90,19 @@ struct hsi_client *hsi_new_client(struct hsi_port *port,
 	cl->tx_cfg = info->tx_cfg;
 	if (cl->tx_cfg.channels) {
 		size = cl->tx_cfg.num_channels * sizeof(*cl->tx_cfg.channels);
-		cl->tx_cfg.channels = kzalloc(size , GFP_KERNEL);
+		cl->tx_cfg.channels = kmemdup(info->tx_cfg.channels, size,
+					      GFP_KERNEL);
 		if (!cl->tx_cfg.channels)
 			goto err_tx;
-		memcpy(cl->tx_cfg.channels, info->tx_cfg.channels, size);
 	}
 
 	cl->rx_cfg = info->rx_cfg;
 	if (cl->rx_cfg.channels) {
 		size = cl->rx_cfg.num_channels * sizeof(*cl->rx_cfg.channels);
-		cl->rx_cfg.channels = kzalloc(size , GFP_KERNEL);
+		cl->rx_cfg.channels = kmemdup(info->rx_cfg.channels, size,
+					      GFP_KERNEL);
 		if (!cl->rx_cfg.channels)
 			goto err_rx;
-		memcpy(cl->rx_cfg.channels, info->rx_cfg.channels, size);
 	}
 
 	cl->device.bus = &hsi_bus_type;
@@ -507,7 +507,7 @@ struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags)
 		port[i]->stop_tx = hsi_dummy_cl;
 		port[i]->release = hsi_dummy_cl;
 		mutex_init(&port[i]->lock);
-		ATOMIC_INIT_NOTIFIER_HEAD(&port[i]->n_head);
+		BLOCKING_INIT_NOTIFIER_HEAD(&port[i]->n_head);
 		dev_set_name(&port[i]->device, "port%d", i);
 		hsi->port[i]->device.release = hsi_port_release;
 		device_initialize(&hsi->port[i]->device);
@@ -689,7 +689,7 @@ int hsi_register_port_event(struct hsi_client *cl,
 	cl->ehandler = handler;
 	cl->nb.notifier_call = hsi_event_notifier_call;
 
-	return atomic_notifier_chain_register(&port->n_head, &cl->nb);
+	return blocking_notifier_chain_register(&port->n_head, &cl->nb);
 }
 EXPORT_SYMBOL_GPL(hsi_register_port_event);
 
@@ -709,7 +709,7 @@ int hsi_unregister_port_event(struct hsi_client *cl)
 
 	WARN_ON(!hsi_port_claimed(cl));
 
-	err = atomic_notifier_chain_unregister(&port->n_head, &cl->nb);
+	err = blocking_notifier_chain_unregister(&port->n_head, &cl->nb);
 	if (!err)
 		cl->ehandler = NULL;
 
@@ -734,7 +734,7 @@ EXPORT_SYMBOL_GPL(hsi_unregister_port_event);
  */
 int hsi_event(struct hsi_port *port, unsigned long event)
 {
-	return atomic_notifier_call_chain(&port->n_head, event, NULL);
+	return blocking_notifier_call_chain(&port->n_head, event, NULL);
 }
 EXPORT_SYMBOL_GPL(hsi_event);
 

include/linux/hsi/hsi.h

@@ -246,7 +246,7 @@ struct hsi_port {
 	int				(*stop_tx)(struct hsi_client *cl);
 	int				(*release)(struct hsi_client *cl);
 	/* private */
-	struct atomic_notifier_head	n_head;
+	struct blocking_notifier_head	n_head;
 };
 
 #define to_hsi_port(dev) container_of(dev, struct hsi_port, device)