From: Biju Das biju.das.jz@bp.renesas.com
[ Upstream commit b620aa3a7be346f04ae7789b165937615c6ee8d3 ]
RSPI IP on RZ/{A, G2L} SoC's has the same signal for both interrupt and DMA transfer request. Setting DMARS register for DMA transfer makes the signal to work as a DMA transfer request signal and subsequent interrupt requests to the interrupt controller are masked.
PIO fallback does not work as interrupt signal is disabled.
This patch fixes this issue by re-enabling the interrupts by calling dmaengine_synchronize().
Signed-off-by: Biju Das biju.das.jz@bp.renesas.com Reviewed-by: Geert Uytterhoeven geert+renesas@glider.be Link: https://lore.kernel.org/r/20220721143449.879257-1-biju.das.jz@bp.renesas.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi-rspi.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index 0524741d73b9..8ae2ac40b4b2 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -595,6 +595,10 @@ static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx, rspi->dma_callbacked, HZ); if (ret > 0 && rspi->dma_callbacked) { ret = 0; + if (tx) + dmaengine_synchronize(rspi->ctlr->dma_tx); + if (rx) + dmaengine_synchronize(rspi->ctlr->dma_rx); } else { if (!ret) { dev_err(&rspi->ctlr->dev, "DMA timeout\n");