| Message ID | 20240329085840.65856-1-jaewon02.kim@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | spi: s3c64xx: Use DMA mode from fifo size | expand |
On 3/29/24 17:58, Jaewon Kim wrote: > If the SPI data size is smaller than FIFO, it operates in PIO mode, > and if it is larger than FIFO size, it oerates in DMA mode. > > If the SPI data size is equal to fifo, it operates in PIO mode and it is > separated to 2 transfers. To prevent it, it must operate in DMA mode > from the case where the data size and the fifo size are the same. > > Fixes: 1ee806718d5e ("spi: s3c64xx: support interrupt based pio mode") > Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com> > Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> > --- > drivers/spi/spi-s3c64xx.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c > index 9fcbe040cb2f..f726d8670428 100644 > --- a/drivers/spi/spi-s3c64xx.c > +++ b/drivers/spi/spi-s3c64xx.c > @@ -430,7 +430,7 @@ static bool s3c64xx_spi_can_dma(struct spi_controller *host, > struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host); > > if (sdd->rx_dma.ch && sdd->tx_dma.ch) > - return xfer->len > sdd->fifo_depth; > + return xfer->len >= sdd->fifo_depth; > > return false; > } > @@ -826,10 +826,9 @@ static int s3c64xx_spi_transfer_one(struct spi_controller *host, > return status; > } > > - if (!is_polling(sdd) && (xfer->len > fifo_len) && > + if (!is_polling(sdd) && xfer->len >= fifo_len && > sdd->rx_dma.ch && sdd->tx_dma.ch) { > use_dma = 1; > - > } else if (xfer->len >= fifo_len) { > tx_buf = xfer->tx_buf; > rx_buf = xfer->rx_buf; Sorry, I didn't add v2 by mistake. This is v1 mail thread. - https://lore.kernel.org/linux-arm-kernel/CAPLW+4k4qh4ZYBufZoGbUZN0yxSE2X8bOdkEQVw1Zg9YUVpbug@mail.gmail.com/T/ Thanks Jaewon Kim
On Fri, 29 Mar 2024 17:58:40 +0900, Jaewon Kim wrote: > If the SPI data size is smaller than FIFO, it operates in PIO mode, > and if it is larger than FIFO size, it oerates in DMA mode. > > If the SPI data size is equal to fifo, it operates in PIO mode and it is > separated to 2 transfers. To prevent it, it must operate in DMA mode > from the case where the data size and the fifo size are the same. > > [...] Applied to https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next Thanks! [1/1] spi: s3c64xx: Use DMA mode from fifo size commit: a3d3eab627bbbb0cb175910cf8d0f7022628a642 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
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 9fcbe040cb2f..f726d8670428 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -430,7 +430,7 @@ static bool s3c64xx_spi_can_dma(struct spi_controller *host, struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host); if (sdd->rx_dma.ch && sdd->tx_dma.ch) - return xfer->len > sdd->fifo_depth; + return xfer->len >= sdd->fifo_depth; return false; } @@ -826,10 +826,9 @@ static int s3c64xx_spi_transfer_one(struct spi_controller *host, return status; } - if (!is_polling(sdd) && (xfer->len > fifo_len) && + if (!is_polling(sdd) && xfer->len >= fifo_len && sdd->rx_dma.ch && sdd->tx_dma.ch) { use_dma = 1; - } else if (xfer->len >= fifo_len) { tx_buf = xfer->tx_buf; rx_buf = xfer->rx_buf;
If the SPI data size is smaller than FIFO, it operates in PIO mode, and if it is larger than FIFO size, it oerates in DMA mode. If the SPI data size is equal to fifo, it operates in PIO mode and it is separated to 2 transfers. To prevent it, it must operate in DMA mode from the case where the data size and the fifo size are the same. Fixes: 1ee806718d5e ("spi: s3c64xx: support interrupt based pio mode") Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> --- drivers/spi/spi-s3c64xx.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)