From: Serge Semin Sergey.Semin@baikalelectronics.ru
[ Upstream commit 43dba9f3f98c2b184a19f856f06fe22817bfd9e0 ]
It's pointless to track the Tx overrun interrupts if Rx-only SPI transfer is issued. Similarly there is no need in handling the Rx overrun/underrun interrupts if Tx-only SPI transfer is executed. So lets unmask the interrupts only if corresponding SPI transactions are implied.
Co-developed-by: Georgy Vlasov Georgy.Vlasov@baikalelectronics.ru Signed-off-by: Georgy Vlasov Georgy.Vlasov@baikalelectronics.ru Signed-off-by: Serge Semin Sergey.Semin@baikalelectronics.ru Cc: Ramil Zaripov Ramil.Zaripov@baikalelectronics.ru Cc: Alexey Malahov Alexey.Malahov@baikalelectronics.ru Cc: Thomas Bogendoerfer tsbogend@alpha.franken.de Cc: Paul Burton paulburton@kernel.org Cc: Ralf Baechle ralf@linux-mips.org Cc: Arnd Bergmann arnd@arndb.de Cc: Andy Shevchenko andriy.shevchenko@linux.intel.com Cc: Rob Herring robh+dt@kernel.org Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org Link: https://lore.kernel.org/r/20200522000806.7381-3-Sergey.Semin@baikalelectroni... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi-dw-mid.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 4f41d44e8b4c..c4244d2f1ee3 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -228,19 +228,23 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws,
static int mid_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) { - u16 dma_ctrl = 0; + u16 imr = 0, dma_ctrl = 0;
dw_writel(dws, DW_SPI_DMARDLR, 0xf); dw_writel(dws, DW_SPI_DMATDLR, 0x10);
- if (xfer->tx_buf) + if (xfer->tx_buf) { dma_ctrl |= SPI_DMA_TDMAE; - if (xfer->rx_buf) + imr |= SPI_INT_TXOI; + } + if (xfer->rx_buf) { dma_ctrl |= SPI_DMA_RDMAE; + imr |= SPI_INT_RXUI | SPI_INT_RXOI; + } dw_writel(dws, DW_SPI_DMACR, dma_ctrl);
/* Set the interrupt mask */ - spi_umask_intr(dws, SPI_INT_TXOI | SPI_INT_RXUI | SPI_INT_RXOI); + spi_umask_intr(dws, imr);
dws->transfer_handler = dma_transfer;