| Message ID | 20240110085403.457089-1-alexander.stein@ew.tq-group.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/1] spi: spi-imx: Use dev_err_probe for failed DMA channel requests | expand |
On Wed, Jan 10, 2024 at 09:54:03AM +0100, Alexander Stein wrote: > If dma_request_chan() fails, no error is shown nor any information is > shown in /sys/kernel/debug/devices_deferred if -EPROBE_DEFER is returned. > Use dev_err_probe to fix both problems. > > Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
On Wed, 10 Jan 2024 09:54:03 +0100, Alexander Stein wrote: > If dma_request_chan() fails, no error is shown nor any information is > shown in /sys/kernel/debug/devices_deferred if -EPROBE_DEFER is returned. > Use dev_err_probe to fix both problems. > > Applied to https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next Thanks! [1/1] spi: spi-imx: Use dev_err_probe for failed DMA channel requests commit: fbc7ee6cc16918ea64a963a4ee097699cc159a8d All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 272bc871a848b..546cdce525fc5 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -1344,7 +1344,7 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, controller->dma_tx = dma_request_chan(dev, "tx"); if (IS_ERR(controller->dma_tx)) { ret = PTR_ERR(controller->dma_tx); - dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret); + dev_err_probe(dev, ret, "can't get the TX DMA channel!\n"); controller->dma_tx = NULL; goto err; } @@ -1353,7 +1353,7 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, controller->dma_rx = dma_request_chan(dev, "rx"); if (IS_ERR(controller->dma_rx)) { ret = PTR_ERR(controller->dma_rx); - dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret); + dev_err_probe(dev, ret, "can't get the RX DMA channel!\n"); controller->dma_rx = NULL; goto err; }
If dma_request_chan() fails, no error is shown nor any information is shown in /sys/kernel/debug/devices_deferred if -EPROBE_DEFER is returned. Use dev_err_probe to fix both problems. Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> --- Sorry, I lost sight of the replies from v1 series. I'll address Fabio's concern here instead. It's true that running spi-imx with SDMA is valid. But if provided DMA channels are not available, aka -EPROBE_DEFER, there is no information why so. This can simply be seen by disabling the sdma1 node on imx8mp: $ cat /sys/kernel/debug/devices_deferred 30820000.spi 30830000.spi 30840000.spi There is no indication what is wrong/missing here. There is also no fallback to pio mode. This patch addresses this by setting the defer probe reason. Changes in v2: * Rebase to next-20240110 [1] https://lore.kernel.org/all/CAOMZO5CcD5iDkaempdxnQHx1fAgnXAmMq_0MdEq5wNgOLHcMuw@mail.gmail.com/ drivers/spi/spi-imx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)