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authorAxel Lin <axel.lin@ingics.com>2015-02-26 10:45:22 +0800
committerJagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>2015-03-30 01:42:49 +0530
commit52091ad146d766cdc5ccd65430b2a4e5cb7aec32 (patch)
treefe337a4e09d6e9a10207d58c0f1f0dedb365013a /drivers
parent1478aeb32dcf57fdd01fd9efc3e3ab0083450cc3 (diff)
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spi: designware_spi: revisit FIFO size detection again
By specification the FIFO size would be in a range 2-256 bytes. From TX Level prospective it means we can set threshold in the range 0-(FIFO size - 1) bytes. Hence there are currently two issues: a) FIFO size 2 bytes is actually skipped since TX Level is 1 bit and could be either 0 or 1 byte; b) FIFO size is incorrectly decreased by 1 which already done by meaning of TX Level register. Fixes: 501943696ea4 (spi: designware_spi: Fix detecting FIFO depth) Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Pavel Machek <pavel@denx.de> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/spi/designware_spi.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c
index 2624844..8f5c0fc 100644
--- a/drivers/spi/designware_spi.c
+++ b/drivers/spi/designware_spi.c
@@ -164,13 +164,13 @@ static void spi_hw_init(struct dw_spi_priv *priv)
if (!priv->fifo_len) {
u32 fifo;
- for (fifo = 2; fifo <= 256; fifo++) {
+ for (fifo = 1; fifo < 256; fifo++) {
dw_writew(priv, DW_SPI_TXFLTR, fifo);
if (fifo != dw_readw(priv, DW_SPI_TXFLTR))
break;
}
- priv->fifo_len = (fifo == 2) ? 0 : fifo - 1;
+ priv->fifo_len = (fifo == 1) ? 0 : fifo;
dw_writew(priv, DW_SPI_TXFLTR, 0);
}
debug("%s: fifo_len=%d\n", __func__, priv->fifo_len);