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authorAlek Du <alek.du@intel.com>2011-03-30 23:09:53 +0800
committerGrant Likely <grant.likely@secretlab.ca>2011-03-30 21:31:48 -0600
commit8a33a373e5ffb6040c58ff41ea48ba21d5f8b5e9 (patch)
tree367a5267512482dc65d0a883156a8dcf0f2e596b /drivers/spi/dw_spi.c
parentde6efe0a966cf86b3c4039a610b2d4157db707f2 (diff)
downloadop-kernel-dev-8a33a373e5ffb6040c58ff41ea48ba21d5f8b5e9.zip
op-kernel-dev-8a33a373e5ffb6040c58ff41ea48ba21d5f8b5e9.tar.gz
spi/dw_spi: remove the un-necessary flush()
The flush() is used to drain all the left data in rx fifo, currently is is always called together with disabling hw. But from spec, disabling hw will also reset all the fifo, so flush() is not needed. Signed-off-by: Alek Du <alek.du@intel.com> Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/dw_spi.c')
-rw-r--r--drivers/spi/dw_spi.c15
1 files changed, 1 insertions, 14 deletions
diff --git a/drivers/spi/dw_spi.c b/drivers/spi/dw_spi.c
index c4fca3d..d3aaf8d 100644
--- a/drivers/spi/dw_spi.c
+++ b/drivers/spi/dw_spi.c
@@ -173,17 +173,6 @@ static void wait_till_not_busy(struct dw_spi *dws)
"DW SPI: Status keeps busy for 5000us after a read/write!\n");
}
-static void flush(struct dw_spi *dws)
-{
- while (dw_readw(dws, sr) & SR_RF_NOT_EMPT) {
- dw_readw(dws, dr);
- cpu_relax();
- }
-
- wait_till_not_busy(dws);
-}
-
-
static int dw_writer(struct dw_spi *dws)
{
u16 txw = 0;
@@ -297,8 +286,7 @@ static void giveback(struct dw_spi *dws)
static void int_error_stop(struct dw_spi *dws, const char *msg)
{
- /* Stop and reset hw */
- flush(dws);
+ /* Stop the hw */
spi_enable_chip(dws, 0);
dev_err(&dws->master->dev, "%s\n", msg);
@@ -800,7 +788,6 @@ static void spi_hw_init(struct dw_spi *dws)
spi_enable_chip(dws, 0);
spi_mask_intr(dws, 0xff);
spi_enable_chip(dws, 1);
- flush(dws);
/*
* Try to detect the FIFO depth if not set by interface driver,
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