| Message ID | 20231209222338.5564-1-benjamin@bigler.one |
|---|---|
| State | Accepted |
| Commit | e9b220aeacf109684cce36a94fc24ed37be92b05 |
| Headers | show |
| Series | spi: spi-imx: correctly configure burst length when using dma | expand |
On Sat, Dec 09, 2023 at 11:23:26PM +0100, Benjamin Bigler wrote: > If DMA is used, burst length should be set to the bus width of the DMA. > Otherwise, the SPI hardware will transmit/receive one word per DMA > request. > Since this issue affects both transmission and reception, it cannot be > detected with a loopback test. > Replace magic numbers 512 and 0xfff with MX51_ECSPI_CTRL_MAX_BURST. > > Signed-off-by: Benjamin Bigler <benjamin@bigler.one> > Reported-by Stefan Bigler <linux@bigler.io> > Fixes: 15a6af94a277 ("spi: Increase imx51 ecspi burst length based on transfer length") > Link: https://lore.kernel.org/r/8a415902c751cdbb4b20ce76569216ed@mail.infomaniak.com > --- > drivers/spi/spi-imx.c | 15 +++++++++++---- > 1 file changed, 11 insertions(+), 4 deletions(-) > Hi, This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree. You are receiving this message because of the following common error(s) as indicated below: - You have marked a patch with a "Fixes:" tag for a commit that is in an older released kernel, yet you do not have a cc: stable line in the signed-off-by area at all, which means that the patch will not be applied to any older kernel releases. To properly fix this, please follow the documented rules in the Documentation/process/stable-kernel-rules.rst file for how to resolve this. If you wish to discuss this problem further, or you have questions about how to resolve this issue, please feel free to respond to this email and Greg will reply once he has dug out from the pending patches received from other developers. thanks, greg k-h's patch email bot
On Sat, 09 Dec 2023 23:23:26 +0100, Benjamin Bigler wrote: > If DMA is used, burst length should be set to the bus width of the DMA. > Otherwise, the SPI hardware will transmit/receive one word per DMA > request. > Since this issue affects both transmission and reception, it cannot be > detected with a loopback test. > Replace magic numbers 512 and 0xfff with MX51_ECSPI_CTRL_MAX_BURST. > > [...] Applied to https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next Thanks! [1/1] spi: spi-imx: correctly configure burst length when using dma commit: e9b220aeacf109684cce36a94fc24ed37be92b05 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 498e35c8db2c..272bc871a848 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -659,11 +659,18 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx, ctrl |= (spi_imx->target_burst * 8 - 1) << MX51_ECSPI_CTRL_BL_OFFSET; else { - if (spi_imx->count >= 512) - ctrl |= 0xFFF << MX51_ECSPI_CTRL_BL_OFFSET; - else - ctrl |= (spi_imx->count * spi_imx->bits_per_word - 1) + if (spi_imx->usedma) { + ctrl |= (spi_imx->bits_per_word * + spi_imx_bytes_per_word(spi_imx->bits_per_word) - 1) << MX51_ECSPI_CTRL_BL_OFFSET; + } else { + if (spi_imx->count >= MX51_ECSPI_CTRL_MAX_BURST) + ctrl |= (MX51_ECSPI_CTRL_MAX_BURST - 1) + << MX51_ECSPI_CTRL_BL_OFFSET; + else + ctrl |= (spi_imx->count * spi_imx->bits_per_word - 1) + << MX51_ECSPI_CTRL_BL_OFFSET; + } } /* set clock speed */
If DMA is used, burst length should be set to the bus width of the DMA. Otherwise, the SPI hardware will transmit/receive one word per DMA request. Since this issue affects both transmission and reception, it cannot be detected with a loopback test. Replace magic numbers 512 and 0xfff with MX51_ECSPI_CTRL_MAX_BURST. Signed-off-by: Benjamin Bigler <benjamin@bigler.one> Reported-by Stefan Bigler <linux@bigler.io> Fixes: 15a6af94a277 ("spi: Increase imx51 ecspi burst length based on transfer length") Link: https://lore.kernel.org/r/8a415902c751cdbb4b20ce76569216ed@mail.infomaniak.com --- drivers/spi/spi-imx.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)