[PATCH] spi: s3c64xx: Disable IRQ mode when using DMA

[PATCH] spi: s3c64xx: Disable IRQ mode when using DMA

[Jaewon Kim]

Fixing the problem of enabling DMA mode and IRQ mode at the same time.
In this case, a value of more than 6bits is written to RDY_LVL, it can
cause an invasion of other registers, potentially leading to SPI
transfer failure.

Fixes: 1ee806718d5e ("spi: s3c64xx: support interrupt based pio mode")
Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/spi/spi-s3c64xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 238db29fc93b..c6a8a6434140 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -782,7 +782,7 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master,
 
 	do {
 		/* transfer size is greater than 32, change to IRQ mode */
-		if (xfer->len > S3C64XX_SPI_POLLING_SIZE)
+		if (!use_dma && xfer->len > S3C64XX_SPI_POLLING_SIZE)
 			use_irq = true;
 
 		if (use_irq) {
-- 
2.17.1

Re: [PATCH] spi: s3c64xx: Disable IRQ mode when using DMA

[Krzysztof Kozlowski]

On 10/05/2023 13:39, Jaewon Kim wrote:
> Fixing the problem of enabling DMA mode and IRQ mode at the same time.
> In this case, a value of more than 6bits is written to RDY_LVL, it can
> cause an invasion of other registers, potentially leading to SPI
> transfer failure.
> 
> Fixes: 1ee806718d5e ("spi: s3c64xx: support interrupt based pio mode")
> Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof

Re: [PATCH] spi: s3c64xx: Disable IRQ mode when using DMA

[Mark Brown]

On Wed, 10 May 2023 20:39:42 +0900, Jaewon Kim wrote:
> Fixing the problem of enabling DMA mode and IRQ mode at the same time.
> In this case, a value of more than 6bits is written to RDY_LVL, it can
> cause an invasion of other registers, potentially leading to SPI
> transfer failure.
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] spi: s3c64xx: Disable IRQ mode when using DMA
      commit: 26cd10a0b9761bffd4669a429f8a33cbccef5bbd

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