diff options
| author | Michal Simek <michal.simek@xilinx.com> | 2014-01-22 09:48:55 +0100 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2014-02-18 22:24:28 +0530 |
| commit | 999c39a45f115a17f6b894e3a9cd894c598fb2e0 (patch) | |
| tree | f3e769476453a81521b89095c0c57dc6dc92bcc6 /drivers | |
| parent | 22a240c32c1340183fce12867ae5f8736b92a638 (diff) | |
spi: xilinx: Move timeout calculation out of the loop
Timeout calculation should be out of the data loop.
This patch increase spi bandwidth for 30%.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/xilinx_spi.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c index 5ac01846e4..56d99d17c7 100644 --- a/drivers/spi/xilinx_spi.c +++ b/drivers/spi/xilinx_spi.c @@ -149,6 +149,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, const unsigned char *txp = dout; unsigned char *rxp = din; unsigned rxecount = 17; /* max. 16 elements in FIFO, leftover 1 */ + unsigned global_timeout; debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__, slave->bus, slave->cs, bitlen, bytes, flags); @@ -176,11 +177,12 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, if (flags & SPI_XFER_BEGIN) spi_cs_activate(slave); - while (bytes--) { - unsigned timeout = /* at least 1usec or greater, leftover 1 */ - xilspi->freq > XILSPI_MAX_XFER_BITS * 1000000 ? 2 : + /* at least 1usec or greater, leftover 1 */ + global_timeout = xilspi->freq > XILSPI_MAX_XFER_BITS * 1000000 ? 2 : (XILSPI_MAX_XFER_BITS * 1000000 / xilspi->freq) + 1; + while (bytes--) { + unsigned timeout = global_timeout; /* get Tx element from data out buffer and count up */ unsigned char d = txp ? *txp++ : CONFIG_XILINX_SPI_IDLE_VAL; debug("%s: tx:%x ", __func__, d); |