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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2015-01-07 14:56:55 (GMT)
committerMark Brown <broonie@kernel.org>2015-01-07 18:01:06 (GMT)
commit30b4b703a5d5aa9977f5ad3aba3d77b6b8d0d255 (patch)
tree698c9525ae87d12d4a5b84c1231d322bf4e757c8 /drivers/spi/spi-dw.c
parent3dbb3b98e854bceed38fbde930fb8cf8701def73 (diff)
downloadlinux-30b4b703a5d5aa9977f5ad3aba3d77b6b8d0d255.tar.xz
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>
Diffstat (limited to 'drivers/spi/spi-dw.c')
-rw-r--r--drivers/spi/spi-dw.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 8edcd1b..5a97a62 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);