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authorBiju Das <biju.das.jz@bp.renesas.com>2022-07-21 17:34:49 +0300
committerMark Brown <broonie@kernel.org>2022-07-21 19:21:07 +0300
commitb620aa3a7be346f04ae7789b165937615c6ee8d3 (patch)
treea7f8559aae453192bf55f846acb8f1abf2a9dc9d /drivers/spi
parente1502ba41699736c578ba9d61ae6285d49f6921b (diff)
downloadlinux-b620aa3a7be346f04ae7789b165937615c6ee8d3.tar.xz
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>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-rspi.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 7a014eeec2d0..411b1307b7fd 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -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");