spi: dw: print debug message with FIFO size

When autodetection is used it would be useful to know what the FIFO size is.
The patch adds a debug message for this purpose.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 8edcd1b84562..5a97a62b298a 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -608,7 +608,7 @@ static void dw_spi_cleanup(struct spi_device *spi)
 }
 
 /* Restart the controller, disable all interrupts, clean rx fifo */
-static void spi_hw_init(struct dw_spi *dws)
+static void spi_hw_init(struct device *dev, struct dw_spi *dws)
 {
         spi_enable_chip(dws, 0);
         spi_mask_intr(dws, 0xff);
@@ -626,9 +626,10 @@ static void spi_hw_init(struct dw_spi *dws)
                         if (fifo != dw_readw(dws, DW_SPI_TXFLTR))
                                 break;
                 }
+                dw_writew(dws, DW_SPI_TXFLTR, 0);
 
                 dws->fifo_len = (fifo == 2) ? 0 : fifo - 1;
-                dw_writew(dws, DW_SPI_TXFLTR, 0);
+                dev_dbg(dev, "Detected FIFO size: %u bytes\n", dws->fifo_len);
         }
 }
 
@@ -668,7 +669,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
         master->dev.of_node = dev->of_node;
 
         /* Basic HW init */
-        spi_hw_init(dws);
+        spi_hw_init(dev, dws);
 
         if (dws->dma_ops && dws->dma_ops->dma_init) {
                 ret = dws->dma_ops->dma_init(dws);
@@ -731,7 +732,7 @@ int dw_spi_resume_host(struct dw_spi *dws)
 {
         int ret;
 
-        spi_hw_init(dws);
+        spi_hw_init(&dws->master->dev, dws);
         ret = spi_master_resume(dws->master);
         if (ret)
                 dev_err(&dws->master->dev, "fail to start queue (%d)\n", ret);