diff options
| author | Jean Pihet <[email protected]> | 2020-01-14 12:41:25 +0000 |
|---|---|---|
| committer | Mark Brown <[email protected]> | 2020-01-14 15:26:05 +0000 |
| commit | e7cc5cfbea4c9bd2c452cb81d0829e9259dd84d8 (patch) | |
| tree | ac6522d791303c61165a16920fde5e00e011274b /drivers/spi/spi-ti-qspi.c | |
| parent | spi: spi-ti-qspi: support large flash devices (diff) | |
| download | kernel-e7cc5cfbea4c9bd2c452cb81d0829e9259dd84d8.tar.gz kernel-e7cc5cfbea4c9bd2c452cb81d0829e9259dd84d8.zip | |
spi: spi-ti-qspi: optimize byte-transfers
Optimize the 8-bit based transfers, as used by the SPI flash
devices, by reading the data registers by 32 and 128 bits when
possible and copy the contents to the receive buffer.
The speed improvement is 4.9x using quad read.
Signed-off-by: Jean Pihet <[email protected]>
Cc: Ryan Barnett <[email protected]>
Cc: Conrad Ratschan <[email protected]>
Cc: Arnout Vandecappelle <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
Diffstat (limited to 'drivers/spi/spi-ti-qspi.c')
| -rw-r--r-- | drivers/spi/spi-ti-qspi.c | 54 |
1 files changed, 51 insertions, 3 deletions
diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c index 0334e2926998..858fda8ac73e 100644 --- a/drivers/spi/spi-ti-qspi.c +++ b/drivers/spi/spi-ti-qspi.c @@ -314,6 +314,8 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t, { int wlen; unsigned int cmd; + u32 rx; + u8 rxlen, rx_wlen; u8 *rxbuf; rxbuf = t->rx_buf; @@ -336,14 +338,60 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t, if (qspi_is_busy(qspi)) return -EBUSY; + switch (wlen) { + case 1: + /* + * Optimize the 8-bit words transfers, as used by + * the SPI flash devices. + */ + if (count >= QSPI_WLEN_MAX_BYTES) { + rxlen = QSPI_WLEN_MAX_BYTES; + } else { + rxlen = min(count, 4); + } + rx_wlen = rxlen << 3; + cmd &= ~QSPI_WLEN_MASK; + cmd |= QSPI_WLEN(rx_wlen); + break; + default: + rxlen = wlen; + break; + } + ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); if (ti_qspi_poll_wc(qspi)) { dev_err(qspi->dev, "read timed out\n"); return -ETIMEDOUT; } + switch (wlen) { case 1: - *rxbuf = readb(qspi->base + QSPI_SPI_DATA_REG); + /* + * Optimize the 8-bit words transfers, as used by + * the SPI flash devices. + */ + if (count >= QSPI_WLEN_MAX_BYTES) { + u32 *rxp = (u32 *) rxbuf; + rx = readl(qspi->base + QSPI_SPI_DATA_REG_3); + *rxp++ = be32_to_cpu(rx); + rx = readl(qspi->base + QSPI_SPI_DATA_REG_2); + *rxp++ = be32_to_cpu(rx); + rx = readl(qspi->base + QSPI_SPI_DATA_REG_1); + *rxp++ = be32_to_cpu(rx); + rx = readl(qspi->base + QSPI_SPI_DATA_REG); + *rxp++ = be32_to_cpu(rx); + } else { + u8 *rxp = rxbuf; + rx = readl(qspi->base + QSPI_SPI_DATA_REG); + if (rx_wlen >= 8) + *rxp++ = rx >> (rx_wlen - 8); + if (rx_wlen >= 16) + *rxp++ = rx >> (rx_wlen - 16); + if (rx_wlen >= 24) + *rxp++ = rx >> (rx_wlen - 24); + if (rx_wlen >= 32) + *rxp++ = rx; + } break; case 2: *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG); @@ -352,8 +400,8 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t, *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG); break; } - rxbuf += wlen; - count -= wlen; + rxbuf += rxlen; + count -= rxlen; } return 0; |