From: Dmitry Baryshkov dmitry.baryshkov@linaro.org
[ Upstream commit d10005837be83906bbd2078c3b4f9dfcbd6c95b6 ]
The GPI DMA mode requires for TX DMA to be prepared. Force SPI core to provide TX buffer even if the caller didn't provide one by setting the SPI_CONTROLLER_MUST_TX flag.
Fixes: b59c122484ec ("spi: spi-geni-qcom: Add support for GPI dma") Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Link: https://lore.kernel.org/r/20230629095847.3648597-1-dmitry.baryshkov@linaro.o... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi-geni-qcom.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c index 26ce959d98dfa..1df9d4844a68d 100644 --- a/drivers/spi/spi-geni-qcom.c +++ b/drivers/spi/spi-geni-qcom.c @@ -1097,6 +1097,12 @@ static int spi_geni_probe(struct platform_device *pdev) if (mas->cur_xfer_mode == GENI_SE_FIFO) spi->set_cs = spi_geni_set_cs;
+ /* + * TX is required per GSI spec, see setup_gsi_xfer(). + */ + if (mas->cur_xfer_mode == GENI_GPI_DMA) + spi->flags = SPI_CONTROLLER_MUST_TX; + ret = request_irq(mas->irq, geni_spi_isr, 0, dev_name(dev), spi); if (ret) goto spi_geni_release_dma;