This is a note to let you know that I've just added the patch titled
spi: spi-geni-qcom: enable SPI_CONTROLLER_MUST_TX for GPI DMA mode
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-spi-geni-qcom-enable-spi_controller_must_tx-for-.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ed1d080b26ffc33136bded12bf8443c94eb1c590
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date: Thu Jun 29 12:58:47 2023 +0300
spi: spi-geni-qcom: enable SPI_CONTROLLER_MUST_TX for GPI DMA mode
[ 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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230629095847.3648597-1-dmitry.baryshkov@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;
