This is a note to let you know that I've just added the patch titled
spi: tegra210-quad: Don't initialise DMA if not supported
to the 6.0-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-tegra210-quad-don-t-initialise-dma-if-not-suppor.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ec5a33a450319bcb3f9c4a9c2c1ee40637255ff6
Author: Jon Hunter <jonathanh@xxxxxxxxxx>
Date: Wed Oct 26 16:56:33 2022 +0100
spi: tegra210-quad: Don't initialise DMA if not supported
[ Upstream commit ae4b3c1252f0fd0951d2f072a02ba46cac8d6c92 ]
The following error messages are observed on boot for Tegra234 ...
ERR KERN tegra-qspi 3270000.spi: cannot use DMA: -19
ERR KERN tegra-qspi 3270000.spi: falling back to PIO
Tegra234 does not support DMA for the QSPI and so initialising the DMA
is expected to fail. The above error messages are misleading for devices
that don't support DMA and so fix this by skipping the DMA
initialisation for devices that don't support DMA.
Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
Acked-by: Thierry Reding <treding@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221026155633.141792-1-jonathanh@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/spi/spi-tegra210-quad.c b/drivers/spi/spi-tegra210-quad.c
index 904972606bd4..10f0c5a6e0dc 100644
--- a/drivers/spi/spi-tegra210-quad.c
+++ b/drivers/spi/spi-tegra210-quad.c
@@ -720,6 +720,9 @@ static int tegra_qspi_start_cpu_based_transfer(struct tegra_qspi *qspi, struct s
static void tegra_qspi_deinit_dma(struct tegra_qspi *tqspi)
{
+ if (!tqspi->soc_data->has_dma)
+ return;
+
if (tqspi->tx_dma_buf) {
dma_free_coherent(tqspi->dev, tqspi->dma_buf_size,
tqspi->tx_dma_buf, tqspi->tx_dma_phys);
@@ -750,6 +753,9 @@ static int tegra_qspi_init_dma(struct tegra_qspi *tqspi)
u32 *dma_buf;
int err;
+ if (!tqspi->soc_data->has_dma)
+ return 0;
+
dma_chan = dma_request_chan(tqspi->dev, "rx");
if (IS_ERR(dma_chan)) {
err = PTR_ERR(dma_chan);
