| Message ID | 20240131024623.329240-1-carlos.song@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | spi: imx: fix the burst length at DMA mode and CPU mode | expand |
On 31.01.2024 10:46:23, carlos.song@nxp.com wrote: > From: Carlos Song <carlos.song@nxp.com> > > 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@nxp.com> > Reviewed-by: Clark Wang <xiaoning.wang@nxp.com> > 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") > --- > 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..b4ade2d53fef 100644 > --- a/drivers/spi/spi-imx.c > +++ b/drivers/spi/spi-imx.c > @@ -54,7 +54,7 @@ MODULE_PARM_DESC(polling_limit_us, > #define MX51_ECSPI_CTRL_MAX_BURST 512 > /* The maximum bytes that IMX53_ECSPI can transfer in target mode.*/ > #define MX53_MAX_TRANSFER_BYTES 512 > - > +#define BITS_PER_BYTE 8 That's already defined in linux/bits.h regards, Marc
> -----Original Message----- > From: Marc Kleine-Budde <mkl@pengutronix.de> > Sent: Wednesday, January 31, 2024 4:08 PM > To: Carlos Song <carlos.song@nxp.com> > Cc: broonie@kernel.org; shawnguo@kernel.org; s.hauer@pengutronix.de; > kernel@pengutronix.de; dl-linux-imx <linux-imx@nxp.com>; benjamin@bigler.one; > stefanmoring@gmail.com; linux-kernel@vger.kernel.org; > linux-arm-kernel@lists.infradead.org; linux-spi@vger.kernel.org > Subject: [EXT] Re: [PATCH] spi: imx: fix the burst length at DMA mode and CPU > mode > > On 31.01.2024 10:46:23, carlos.song@nxp.com wrote: > > From: Carlos Song <carlos.song@nxp.com> > > > > 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@nxp.com> > > Reviewed-by: Clark Wang <xiaoning.wang@nxp.com> > > 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") > > --- > > 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..b4ade2d53fef 100644 > > --- a/drivers/spi/spi-imx.c > > +++ b/drivers/spi/spi-imx.c > > @@ -54,7 +54,7 @@ MODULE_PARM_DESC(polling_limit_us, > > #define MX51_ECSPI_CTRL_MAX_BURST 512 > > /* The maximum bytes that IMX53_ECSPI can transfer in target mode.*/ > > #define MX53_MAX_TRANSFER_BYTES 512 > > - > > +#define BITS_PER_BYTE 8 > It will be removed and I will send patch V2. Thank you! BR Carlos > That's already defined in linux/bits.h > > regards, > Marc > > -- > Pengutronix e.K. | Marc Kleine-Budde | > Embedded Linux | https://www.pengutronix.de | > Vertretung Nürnberg | Phone: +49-5121-206917-129 | > Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-9 |
On Wed, Jan 31, 2024 at 10:46:23AM +0800, carlos.song@nxp.com wrote: > From: Carlos Song <carlos.song@nxp.com> > > 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@nxp.com> > Reviewed-by: Clark Wang <xiaoning.wang@nxp.com> > 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") Cc:stable... > --- > 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..b4ade2d53fef 100644 > --- a/drivers/spi/spi-imx.c > +++ b/drivers/spi/spi-imx.c > @@ -54,7 +54,7 @@ MODULE_PARM_DESC(polling_limit_us, > #define MX51_ECSPI_CTRL_MAX_BURST 512 > /* The maximum bytes that IMX53_ECSPI can transfer in target mode.*/ > #define MX53_MAX_TRANSFER_BYTES 512 > - > +#define BITS_PER_BYTE 8 this is already defined in linux/bits.h, just use it from there. Francesco
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 546cdce525fc..b4ade2d53fef 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -54,7 +54,7 @@ MODULE_PARM_DESC(polling_limit_us, #define MX51_ECSPI_CTRL_MAX_BURST 512 /* The maximum bytes that IMX53_ECSPI can transfer in target mode.*/ #define MX53_MAX_TRANSFER_BYTES 512 - +#define BITS_PER_BYTE 8 enum spi_imx_devtype { IMX1_CSPI, IMX21_CSPI, @@ -660,15 +660,14 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx, << MX51_ECSPI_CTRL_BL_OFFSET; else { if (spi_imx->usedma) { - ctrl |= (spi_imx->bits_per_word * - spi_imx_bytes_per_word(spi_imx->bits_per_word) - 1) + ctrl |= (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) + ctrl |= (MX51_ECSPI_CTRL_MAX_BURST * BITS_PER_BYTE - 1) << MX51_ECSPI_CTRL_BL_OFFSET; else - ctrl |= (spi_imx->count * spi_imx->bits_per_word - 1) + ctrl |= (spi_imx->count * BITS_PER_BYTE - 1) << MX51_ECSPI_CTRL_BL_OFFSET; } }