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xilinx_spips: lqspi: Push more data to tx-fifo

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Do 16 words per fifo flush. Increases performance and decreases
debug verbosity. This data depth has no real hardware analogue,
so just go with something that has reasonable performance.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Message-id: 5621ee4621941d3639b5cacfdec26bd3148f31d5.1369117359.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Crosthwaite 2013-06-03 17:17:44 +01:00 committed by Peter Maydell
parent 4a5b6fa8d9
commit a66418f6f1
1 changed files with 7 additions and 4 deletions
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11
hw/ssi/xilinx_spips.c
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@ -608,11 +608,14 @@ lqspi_read(void *opaque, hwaddr addr, unsigned int size)
DB_PRINT_L(0, "starting QSPI data read\n");
for (i = 0; i < LQSPI_CACHE_SIZE / 4; ++i) {
tx_data_bytes(s, 0, 4);
while (cache_entry < LQSPI_CACHE_SIZE / 4) {
for (i = 0; i < 16; ++i) {
tx_data_bytes(s, 0, 4);
}
xilinx_spips_flush_txfifo(s);
rx_data_bytes(s, &q->lqspi_buf[cache_entry], 4);
cache_entry++;
for (i = 0; i < 16; ++i) {
rx_data_bytes(s, &q->lqspi_buf[cache_entry++], 4);
}
}
s->regs[R_LQSPI_STS] &= ~LQSPI_CFG_U_PAGE;