Merge tag 'spi-fix-v5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi fixes from Mark Brown:
 "Quite a lot of fixes here for no single reason.

  There's a collection of the usual sort of device specific fixes and
  also a bunch of people have been working on spidev and the userspace
  test program spidev_test so they've got an unusually large collection
  of small fixes"

* tag 'spi-fix-v5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: spidev: fix a potential use-after-free in spidev_release()
  spi: spidev: fix a race between spidev_release and spidev_remove
  spi: stm32-qspi: Fix error path in case of -EPROBE_DEFER
  spi: uapi: spidev: Use TABs for alignment
  spi: spi-fsl-dspi: Free DMA memory with matching function
  spi: tools: Add macro definitions to fix build errors
  spi: tools: Make default_tx/rx and input_tx static
  spi: dt-bindings: amlogic, meson-gx-spicc: Fix schema for meson-g12a
  spi: rspi: Use requested instead of maximum bit rate
  spi: spidev_test: Use %u to format unsigned numbers
  spi: sprd: switch the sequence of setting WDG_LOAD_LOW and _HIGH

Documentation/devicetree/bindings/spi/amlogic,meson-gx-spicc.yaml

@@ -34,12 +34,15 @@ properties:
     maxItems: 1
 
   clocks:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
+    items:
+      - description: controller register bus clock
+      - description: baud rate generator and delay control clock
 
   clock-names:
-    description: input clock for the baud rate generator
-    items:
-      - const: core
+    minItems: 1
+    maxItems: 2
 
 if:
   properties:
@@ -51,17 +54,22 @@ if:
 then:
   properties:
     clocks:
-      contains:
-        items:
-          - description: controller register bus clock
-          - description: baud rate generator and delay control clock
+      minItems: 2
 
     clock-names:
-      minItems: 2
       items:
         - const: core
         - const: pclk
 
+else:
+  properties:
+    clocks:
+      maxItems: 1
+
+    clock-names:
+      items:
+        - const: core
+
 required:
   - compatible
   - reg

drivers/spi/spi-fsl-dspi.c

@@ -588,14 +588,14 @@ static void dspi_release_dma(struct fsl_dspi *dspi)
 		return;
 
 	if (dma->chan_tx) {
-		dma_unmap_single(dma->chan_tx->device->dev, dma->tx_dma_phys,
-				 dma_bufsize, DMA_TO_DEVICE);
+		dma_free_coherent(dma->chan_tx->device->dev, dma_bufsize,
+				  dma->tx_dma_buf, dma->tx_dma_phys);
 		dma_release_channel(dma->chan_tx);
 	}
 
 	if (dma->chan_rx) {
-		dma_unmap_single(dma->chan_rx->device->dev, dma->rx_dma_phys,
-				 dma_bufsize, DMA_FROM_DEVICE);
+		dma_free_coherent(dma->chan_rx->device->dev, dma_bufsize,
+				  dma->rx_dma_buf, dma->rx_dma_phys);
 		dma_release_channel(dma->chan_rx);
 	}
 }

drivers/spi/spi-rspi.c

@@ -179,7 +179,7 @@
 
 struct rspi_data {
 	void __iomem *addr;
-	u32 max_speed_hz;
+	u32 speed_hz;
 	struct spi_controller *ctlr;
 	struct platform_device *pdev;
 	wait_queue_head_t wait;
@@ -258,8 +258,7 @@ static int rspi_set_config_register(struct rspi_data *rspi, int access_size)
 	rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
 
 	/* Sets transfer bit rate */
-	spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk),
-			    2 * rspi->max_speed_hz) - 1;
+	spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk), 2 * rspi->speed_hz) - 1;
 	rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
 
 	/* Disable dummy transmission, set 16-bit word access, 1 frame */
@@ -299,14 +298,14 @@ static int rspi_rz_set_config_register(struct rspi_data *rspi, int access_size)
 
 	clksrc = clk_get_rate(rspi->clk);
 	while (div < 3) {
-		if (rspi->max_speed_hz >= clksrc/4) /* 4=(CLK/2)/2 */
+		if (rspi->speed_hz >= clksrc/4) /* 4=(CLK/2)/2 */
 			break;
 		div++;
 		clksrc /= 2;
 	}
 
 	/* Sets transfer bit rate */
-	spbr = DIV_ROUND_UP(clksrc, 2 * rspi->max_speed_hz) - 1;
+	spbr = DIV_ROUND_UP(clksrc, 2 * rspi->speed_hz) - 1;
 	rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
 	rspi->spcmd |= div << 2;
 
@@ -341,7 +340,7 @@ static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
 	rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
 
 	/* Sets transfer bit rate */
-	spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk), 2 * rspi->max_speed_hz);
+	spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk), 2 * rspi->speed_hz);
 	rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
 
 	/* Disable dummy transmission, set byte access */
@@ -949,9 +948,24 @@ static int rspi_prepare_message(struct spi_controller *ctlr,
 {
 	struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
 	struct spi_device *spi = msg->spi;
+	const struct spi_transfer *xfer;
 	int ret;
 
-	rspi->max_speed_hz = spi->max_speed_hz;
+	/*
+	 * As the Bit Rate Register must not be changed while the device is
+	 * active, all transfers in a message must use the same bit rate.
+	 * In theory, the sequencer could be enabled, and each Command Register
+	 * could divide the base bit rate by a different value.
+	 * However, most RSPI variants do not have Transfer Data Length
+	 * Multiplier Setting Registers, so each sequence step would be limited
+	 * to a single word, making this feature unsuitable for large
+	 * transfers, which would gain most from it.
+	 */
+	rspi->speed_hz = spi->max_speed_hz;
+	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
+		if (xfer->speed_hz < rspi->speed_hz)
+			rspi->speed_hz = xfer->speed_hz;
+	}
 
 	rspi->spcmd = SPCMD_SSLKP;
 	if (spi->mode & SPI_CPOL)

drivers/spi/spi-sprd-adi.c

@@ -389,9 +389,9 @@ static int sprd_adi_restart_handler(struct notifier_block *this,
 	sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_CTRL, val);
 
 	/* Load the watchdog timeout value, 50ms is always enough. */
+	sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_HIGH, 0);
 	sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_LOW,
 		       WDG_LOAD_VAL & WDG_LOAD_MASK);
-	sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_HIGH, 0);
 
 	/* Start the watchdog to reset system */
 	sprd_adi_read(sadi, sadi->slave_pbase + REG_WDG_CTRL, &val);

drivers/spi/spi-stm32-qspi.c

@@ -553,20 +553,6 @@ static const struct spi_controller_mem_ops stm32_qspi_mem_ops = {
 	.exec_op = stm32_qspi_exec_op,
 };
 
-static void stm32_qspi_release(struct stm32_qspi *qspi)
-{
-	pm_runtime_get_sync(qspi->dev);
-	/* disable qspi */
-	writel_relaxed(0, qspi->io_base + QSPI_CR);
-	stm32_qspi_dma_free(qspi);
-	mutex_destroy(&qspi->lock);
-	pm_runtime_put_noidle(qspi->dev);
-	pm_runtime_disable(qspi->dev);
-	pm_runtime_set_suspended(qspi->dev);
-	pm_runtime_dont_use_autosuspend(qspi->dev);
-	clk_disable_unprepare(qspi->clk);
-}
-
 static int stm32_qspi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -642,7 +628,7 @@ static int stm32_qspi_probe(struct platform_device *pdev)
 	if (IS_ERR(rstc)) {
 		ret = PTR_ERR(rstc);
 		if (ret == -EPROBE_DEFER)
-			goto err_qspi_release;
+			goto err_clk_disable;
 	} else {
 		reset_control_assert(rstc);
 		udelay(2);
@@ -653,7 +639,7 @@ static int stm32_qspi_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, qspi);
 	ret = stm32_qspi_dma_setup(qspi);
 	if (ret)
-		goto err_qspi_release;
+		goto err_dma_free;
 
 	mutex_init(&qspi->lock);
 
@@ -673,15 +659,26 @@ static int stm32_qspi_probe(struct platform_device *pdev)
 
 	ret = devm_spi_register_master(dev, ctrl);
 	if (ret)
-		goto err_qspi_release;
+		goto err_pm_runtime_free;
 
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);
 
 	return 0;
 
-err_qspi_release:
-	stm32_qspi_release(qspi);
+err_pm_runtime_free:
+	pm_runtime_get_sync(qspi->dev);
+	/* disable qspi */
+	writel_relaxed(0, qspi->io_base + QSPI_CR);
+	mutex_destroy(&qspi->lock);
+	pm_runtime_put_noidle(qspi->dev);
+	pm_runtime_disable(qspi->dev);
+	pm_runtime_set_suspended(qspi->dev);
+	pm_runtime_dont_use_autosuspend(qspi->dev);
+err_dma_free:
+	stm32_qspi_dma_free(qspi);
+err_clk_disable:
+	clk_disable_unprepare(qspi->clk);
 err_master_put:
 	spi_master_put(qspi->ctrl);
 
@@ -692,7 +689,16 @@ static int stm32_qspi_remove(struct platform_device *pdev)
 {
 	struct stm32_qspi *qspi = platform_get_drvdata(pdev);
 
-	stm32_qspi_release(qspi);
+	pm_runtime_get_sync(qspi->dev);
+	/* disable qspi */
+	writel_relaxed(0, qspi->io_base + QSPI_CR);
+	stm32_qspi_dma_free(qspi);
+	mutex_destroy(&qspi->lock);
+	pm_runtime_put_noidle(qspi->dev);
+	pm_runtime_disable(qspi->dev);
+	pm_runtime_set_suspended(qspi->dev);
+	pm_runtime_dont_use_autosuspend(qspi->dev);
+	clk_disable_unprepare(qspi->clk);
 
 	return 0;
 }

drivers/spi/spidev.c

@@ -609,15 +609,20 @@ static int spidev_open(struct inode *inode, struct file *filp)
 static int spidev_release(struct inode *inode, struct file *filp)
 {
 	struct spidev_data	*spidev;
+	int			dofree;
 
 	mutex_lock(&device_list_lock);
 	spidev = filp->private_data;
 	filp->private_data = NULL;
 
+	spin_lock_irq(&spidev->spi_lock);
+	/* ... after we unbound from the underlying device? */
+	dofree = (spidev->spi == NULL);
+	spin_unlock_irq(&spidev->spi_lock);
+
 	/* last close? */
 	spidev->users--;
 	if (!spidev->users) {
-		int		dofree;
 
 		kfree(spidev->tx_buffer);
 		spidev->tx_buffer = NULL;
@@ -625,18 +630,13 @@ static int spidev_release(struct inode *inode, struct file *filp)
 		kfree(spidev->rx_buffer);
 		spidev->rx_buffer = NULL;
 
-		spin_lock_irq(&spidev->spi_lock);
-		if (spidev->spi)
-			spidev->speed_hz = spidev->spi->max_speed_hz;
-
-		/* ... after we unbound from the underlying device? */
-		dofree = (spidev->spi == NULL);
-		spin_unlock_irq(&spidev->spi_lock);
-
 		if (dofree)
 			kfree(spidev);
+		else
+			spidev->speed_hz = spidev->spi->max_speed_hz;
 	}
 #ifdef CONFIG_SPI_SLAVE
+	if (!dofree)
 		spi_slave_abort(spidev->spi);
 #endif
 	mutex_unlock(&device_list_lock);
@@ -787,13 +787,13 @@ static int spidev_remove(struct spi_device *spi)
 {
 	struct spidev_data	*spidev = spi_get_drvdata(spi);
 
+	/* prevent new opens */
+	mutex_lock(&device_list_lock);
 	/* make sure ops on existing fds can abort cleanly */
 	spin_lock_irq(&spidev->spi_lock);
 	spidev->spi = NULL;
 	spin_unlock_irq(&spidev->spi_lock);
 
-	/* prevent new opens */
-	mutex_lock(&device_list_lock);
 	list_del(&spidev->device_entry);
 	device_destroy(spidev_class, spidev->devt);
 	clear_bit(MINOR(spidev->devt), minors);

include/uapi/linux/spi/spidev.h

@@ -48,6 +48,10 @@
 #define SPI_TX_QUAD		0x200
 #define SPI_RX_DUAL		0x400
 #define SPI_RX_QUAD		0x800
+#define SPI_CS_WORD		0x1000
+#define SPI_TX_OCTAL		0x2000
+#define SPI_RX_OCTAL		0x4000
+#define SPI_3WIRE_HIZ		0x8000
 
 /*---------------------------------------------------------------------------*/
 

tools/spi/spidev_test.c

@@ -47,7 +47,7 @@ static int transfer_size;
 static int iterations;
 static int interval = 5; /* interval in seconds for showing transfer rate */
 
-uint8_t default_tx[] = {
+static uint8_t default_tx[] = {
 	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
 	0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
 	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
@@ -56,8 +56,8 @@ uint8_t default_tx[] = {
 	0xF0, 0x0D,
 };
 
-uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
-char *input_tx;
+static uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
+static char *input_tx;
 
 static void hex_dump(const void *src, size_t length, size_t line_size,
 		     char *prefix)
@@ -461,8 +461,8 @@ int main(int argc, char *argv[])
 		pabort("can't get max speed hz");
 
 	printf("spi mode: 0x%x\n", mode);
-	printf("bits per word: %d\n", bits);
-	printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
+	printf("bits per word: %u\n", bits);
+	printf("max speed: %u Hz (%u kHz)\n", speed, speed/1000);
 
 	if (input_tx)
 		transfer_escaped_string(fd, input_tx);