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
  ...

Author: torvalds

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

@@ -1,7 +1,8 @@
 #
 # 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");
@@ -696,35 +704,37 @@ 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)
 {
 	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");
@@ -849,17 +859,17 @@ 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);
 		} else {
 			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) {