Re: [PATCH v3] spi: imx: fix the burst length at DMA mode and CPU mode

[Carlos Song <carlos.song@xxxxxxx>]

> -----Original Message-----
> From: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> Sent: Thursday, February 1, 2024 6:06 PM
> To: Carlos Song <carlos.song@xxxxxxx>
> Cc: broonie@xxxxxxxxxx; shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx;
> kernel@xxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>; benjamin@xxxxxxxxxx;
> stefanmoring@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-spi@xxxxxxxxxxxxxxx
> Subject: [EXT] Re: [PATCH v3] spi: imx: fix the burst length at DMA mode and CPU
> mode
>
> Caution: This is an external email. Please take care when clicking links or opening
> attachments. When in doubt, report the message using the 'Report this email'
> button
>
>
> On 01.02.2024 18:01:15, carlos.song@xxxxxxx wrote:
> > From: Carlos Song <carlos.song@xxxxxxx>
> >
> > For DMA mode, the bus width of the DMA is equal to the size of data
> > word, so burst length should be configured as bits per word.
> >
> > For CPU mode, because of the spi transfer len is in byte, so burst
> > length should be configured as bits per byte * spi_imx->count.
> >
> > Signed-off-by: Carlos Song <carlos.song@xxxxxxx>
> > Reviewed-by: Clark Wang <xiaoning.wang@xxxxxxx>
> > Fixes: e9b220aeacf1 ("spi: spi-imx: correctly configure burst length
> > when using dma")
> > Fixes: 5f66db08cbd3 ("spi: imx: Take in account bits per word instead
> > of assuming 8-bits")
> > ---
> > Changes for V3:
> > - include <linux/bits.h>
> > ---
> >  drivers/spi/spi-imx.c | 9 ++++-----
> >  1 file changed, 4 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index
> > 546cdce525fc..2a1ae7b00760 100644
> > --- a/drivers/spi/spi-imx.c
> > +++ b/drivers/spi/spi-imx.c
> > @@ -21,7 +21,7 @@
> >  #include <linux/types.h>
> >  #include <linux/of.h>
> >  #include <linux/property.h>
> > -
> > +#include <linux/bits.h>
>
> nitpick:
> Please keep the includes sorted alphabetically.
>
> >  #include <linux/dma/imx-dma.h>
>
Hi,

Hhh, thank you!
I will try my best to strictly adhere to the code format in the future!
This is a good habit and I couldn't agree more! V4 will be sent.

BR
Carlos


> Marc
>
> --
> Pengutronix e.K.                 | Marc Kleine-Budde          |
> Embedded Linux                   |
> https://www.pen/
> gutronix.de%2F&data=05%7C02%7Ccarlos.song%40nxp.com%7C53112bdae1e4
> 478f5fff08dc230d69fb%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%
> 7C638423787724098671%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw
> MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&s
> data=33MzYSg%2Fq5ciMNGJmbrUcprP%2BH%2F%2FNl0IPNcUO%2BHoeF4%3D
> &reserved=0 |
> Vertretung Nürnberg              | Phone: +49-5121-206917-129 |
> Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-9   |