From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Applied "spi: spi-ti-qspi: optimize byte-transfers" to the spi tree Date: Tue, 14 Jan 2020 16:09:25 +0000 (GMT) Message-ID: References: <20200114124125.361429-3-jean.pihet@newoldbits.com> Cc: Arnout Vandecappelle , Conrad Ratschan , linux-omap@vger.kernel.org, linux-spi@vger.kernel.org, Mark Brown , Ryan Barnett , Tony Lindgren , Vignesh Raghavendra To: Jean Pihet Return-path: In-Reply-To: <20200114124125.361429-3-jean.pihet@newoldbits.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-spi.vger.kernel.org The patch spi: spi-ti-qspi: optimize byte-transfers has been applied to the spi tree at https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-5.6 All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark >>From e7cc5cfbea4c9bd2c452cb81d0829e9259dd84d8 Mon Sep 17 00:00:00 2001 From: Jean Pihet Date: Tue, 14 Jan 2020 13:41:25 +0100 Subject: [PATCH] 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 Cc: Ryan Barnett Cc: Conrad Ratschan Cc: Arnout Vandecappelle Link: https://lore.kernel.org/r/20200114124125.361429-3-jean.pihet@newoldbits.com Signed-off-by: Mark Brown --- drivers/spi/spi-ti-qspi.c | 54 ++++++++++++++++++++++++++++++++++++--- 1 file 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; -- 2.20.1