spi: spi-rspi: Fix PIO fallback on RZ platforms

[ 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>

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index ea03cc589e61f2e7c2e03c97fc8d57d778ab2246..4600e3c9e49e43f058ad9dfe5ace3615325336c7 100644 (file)
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -612,6 +612,10 @@ 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");