spi: Fixes for v3.9

A bunch of small driver fixes plus a fix for error handling in the core
 - nothing too exciting overall.
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Merge tag 'spi-fix-v3.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc

Pull spi fixes from Mark Brown:
 "A bunch of small driver fixes plus a fix for error handling in the
  core - nothing too exciting overall."

* tag 'spi-fix-v3.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc:
  spi/mpc512x-psc: optionally keep PSC SS asserted across xfer segmensts
  spi: Unlock a spinlock before calling into the controller driver.
  spi/s3c64xx: modified error interrupt handling and init
  spi/bcm63xx: don't disable non enabled clocks in probe error path
  spi/bcm63xx: Remove unused variable
  spi: slink-tegra20: move runtime pm calls to transfer_one_message

drivers/spi/spi-bcm63xx.c

@@ -152,7 +152,6 @@ static void bcm63xx_spi_setup_transfer(struct spi_device *spi,
 static int bcm63xx_spi_setup(struct spi_device *spi)
 {
 	struct bcm63xx_spi *bs;
-	int ret;
 
 	bs = spi_master_get_devdata(spi->master);
 
@@ -490,7 +489,7 @@ static int bcm63xx_spi_probe(struct platform_device *pdev)
 	default:
 		dev_err(dev, "unsupported MSG_CTL width: %d\n",
 			 bs->msg_ctl_width);
-		goto out_clk_disable;
+		goto out_err;
 	}
 
 	/* Initialize hardware */

drivers/spi/spi-mpc512x-psc.c

@@ -164,7 +164,7 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi,
 
 		for (i = count; i > 0; i--) {
 			data = tx_buf ? *tx_buf++ : 0;
-			if (len == EOFBYTE)
+			if (len == EOFBYTE && t->cs_change)
 				setbits32(&fifo->txcmd, MPC512x_PSC_FIFO_EOF);
 			out_8(&fifo->txdata_8, data);
 			len--;

drivers/spi/spi-s3c64xx.c

@@ -994,25 +994,30 @@ static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
 {
 	struct s3c64xx_spi_driver_data *sdd = data;
 	struct spi_master *spi = sdd->master;
-	unsigned int val;
+	unsigned int val, clr = 0;
 
-	val = readl(sdd->regs + S3C64XX_SPI_PENDING_CLR);
+	val = readl(sdd->regs + S3C64XX_SPI_STATUS);
 
-	val &= S3C64XX_SPI_PND_RX_OVERRUN_CLR |
-		S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
-		S3C64XX_SPI_PND_TX_OVERRUN_CLR |
-		S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
-
-	writel(val, sdd->regs + S3C64XX_SPI_PENDING_CLR);
-
-	if (val & S3C64XX_SPI_PND_RX_OVERRUN_CLR)
+	if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) {
+		clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR;
 		dev_err(&spi->dev, "RX overrun\n");
-	if (val & S3C64XX_SPI_PND_RX_UNDERRUN_CLR)
+	}
+	if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) {
+		clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR;
 		dev_err(&spi->dev, "RX underrun\n");
-	if (val & S3C64XX_SPI_PND_TX_OVERRUN_CLR)
+	}
+	if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) {
+		clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR;
 		dev_err(&spi->dev, "TX overrun\n");
-	if (val & S3C64XX_SPI_PND_TX_UNDERRUN_CLR)
+	}
+	if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) {
+		clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
 		dev_err(&spi->dev, "TX underrun\n");
+	}
+
+	/* Clear the pending irq by setting and then clearing it */
+	writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR);
+	writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR);
 
 	return IRQ_HANDLED;
 }
@@ -1036,9 +1041,13 @@ static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
 	writel(0, regs + S3C64XX_SPI_MODE_CFG);
 	writel(0, regs + S3C64XX_SPI_PACKET_CNT);
 
-	/* Clear any irq pending bits */
-	writel(readl(regs + S3C64XX_SPI_PENDING_CLR),
-				regs + S3C64XX_SPI_PENDING_CLR);
+	/* Clear any irq pending bits, should set and clear the bits */
+	val = S3C64XX_SPI_PND_RX_OVERRUN_CLR |
+		S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
+		S3C64XX_SPI_PND_TX_OVERRUN_CLR |
+		S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
+	writel(val, regs + S3C64XX_SPI_PENDING_CLR);
+	writel(0, regs + S3C64XX_SPI_PENDING_CLR);
 
 	writel(0, regs + S3C64XX_SPI_SWAP_CFG);
 

drivers/spi/spi-tegra20-slink.c

@@ -858,21 +858,6 @@ static int tegra_slink_setup(struct spi_device *spi)
 	return 0;
 }
 
-static int tegra_slink_prepare_transfer(struct spi_master *master)
-{
-	struct tegra_slink_data *tspi = spi_master_get_devdata(master);
-
-	return pm_runtime_get_sync(tspi->dev);
-}
-
-static int tegra_slink_unprepare_transfer(struct spi_master *master)
-{
-	struct tegra_slink_data *tspi = spi_master_get_devdata(master);
-
-	pm_runtime_put(tspi->dev);
-	return 0;
-}
-
 static int tegra_slink_transfer_one_message(struct spi_master *master,
 			struct spi_message *msg)
 {
@@ -885,6 +870,12 @@ static int tegra_slink_transfer_one_message(struct spi_master *master,
 
 	msg->status = 0;
 	msg->actual_length = 0;
+	ret = pm_runtime_get_sync(tspi->dev);
+	if (ret < 0) {
+		dev_err(tspi->dev, "runtime get failed: %d\n", ret);
+		goto done;
+	}
+
 	single_xfer = list_is_singular(&msg->transfers);
 	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 		INIT_COMPLETION(tspi->xfer_completion);
@@ -921,6 +912,8 @@ static int tegra_slink_transfer_one_message(struct spi_master *master,
 exit:
 	tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND);
 	tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2);
+	pm_runtime_put(tspi->dev);
+done:
 	msg->status = ret;
 	spi_finalize_current_message(master);
 	return ret;
@@ -1148,9 +1141,7 @@ static int tegra_slink_probe(struct platform_device *pdev)
 	/* the spi->mode bits understood by this driver: */
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
 	master->setup = tegra_slink_setup;
-	master->prepare_transfer_hardware = tegra_slink_prepare_transfer;
 	master->transfer_one_message = tegra_slink_transfer_one_message;
-	master->unprepare_transfer_hardware = tegra_slink_unprepare_transfer;
 	master->num_chipselect = MAX_CHIP_SELECT;
 	master->bus_num = -1;
 

drivers/spi/spi.c

@@ -543,17 +543,16 @@ static void spi_pump_messages(struct kthread_work *work)
 	/* Lock queue and check for queue work */
 	spin_lock_irqsave(&master->queue_lock, flags);
 	if (list_empty(&master->queue) || !master->running) {
-		if (master->busy && master->unprepare_transfer_hardware) {
-			ret = master->unprepare_transfer_hardware(master);
-			if (ret) {
-				spin_unlock_irqrestore(&master->queue_lock, flags);
-				dev_err(&master->dev,
-					"failed to unprepare transfer hardware\n");
-				return;
-			}
+		if (!master->busy) {
+			spin_unlock_irqrestore(&master->queue_lock, flags);
+			return;
 		}
 		master->busy = false;
 		spin_unlock_irqrestore(&master->queue_lock, flags);
+		if (master->unprepare_transfer_hardware &&
+		    master->unprepare_transfer_hardware(master))
+			dev_err(&master->dev,
+				"failed to unprepare transfer hardware\n");
 		return;
 	}