| From | Ricardo Ribalda Delgado <> | Subject | [PATCH 16/18] spi/xilinx: Reset core before buffer_size detection | Date | Fri, 23 Jan 2015 17:08:48 +0100 |
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If the core had some data on the buffer, the size detection could show up a smaller size than real, affecting performance.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> --- drivers/spi/spi-xilinx.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c index 704613c..8c25c59 100644 --- a/drivers/spi/spi-xilinx.c +++ b/drivers/spi/spi-xilinx.c @@ -295,6 +295,13 @@ static int xilinx_spi_find_buffer_size(struct xilinx_spi *xspi) u8 sr; int n_words = 0; + /* + * Before the buffer_size detection we reset the core + * to make sure we start with a clean state. + */ + xspi->write_fn(XIPIF_V123B_RESET_MASK, + xspi->regs + XIPIF_V123B_RESETR_OFFSET); + /* Fill the Tx FIFO with as many words as possible */ do { xspi->write_fn(0, xspi->regs + XSPI_TXD_OFFSET); -- 2.1.4
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