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

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>
This commit is contained in:
Biju Das 2022-07-21 15:34:49 +01:00 committed by Mark Brown
parent e1502ba416
commit b620aa3a7b
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GPG Key ID: 24D68B725D5487D0
1 changed files with 4 additions and 0 deletions
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4
drivers/spi/spi-rspi.c
View File

@ -613,6 +613,10 @@ 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");