From: Serge Semin <sergey.se...@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.vla...@baikalelectronics.ru> Signed-off-by: Georgy Vlasov <georgy.vla...@baikalelectronics.ru> Signed-off-by: Serge Semin <sergey.se...@baikalelectronics.ru> Cc: Ramil Zaripov <ramil.zari...@baikalelectronics.ru> Cc: Alexey Malahov <alexey.mala...@baikalelectronics.ru> Cc: Thomas Bogendoerfer <tsbog...@alpha.franken.de> Cc: Paul Burton <paulbur...@kernel.org> Cc: Ralf Baechle <r...@linux-mips.org> Cc: Arnd Bergmann <a...@arndb.de> Cc: Andy Shevchenko <andriy.shevche...@linux.intel.com> Cc: Rob Herring <robh...@kernel.org> Cc: linux-m...@vger.kernel.org Cc: devicet...@vger.kernel.org Link: https://lore.kernel.org/r/20200522000806.7381-3-sergey.se...@baikalelectronics.ru Signed-off-by: Mark Brown <broo...@kernel.org> Signed-off-by: Sasha Levin <sas...@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 f7ec8b98e6db..e1b34ef9a31c 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; -- 2.25.1
