RE: [PATCH v14 08/12] spi: imx: remove ERR009165 workaround on i.mx6ul

[Robin Gong <yibin.gong@nxp.com>]

On 09/07/21 17:42 Lucas Stach <l.stach@pengutronix.de> wrote: 
> Am Mittwoch, dem 07.04.2021 um 23:30 +0800 schrieb Robin Gong:
> > ERR009165 fixed on i.mx6ul/6ull/6sll. All other i.mx6/7 and i.mx8m/8mm
> > still need this errata. Please refer to nxp official errata document
> > from
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.n
> xp.com%2F&amp;data=04%7C01%7Cyibin.gong%40nxp.com%7C48156bc93d
> c84ac26e9d08d942bdc0ac%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%
> 7C1%7C637614205017900475%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4
> wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&a
> mp;sdata=keYQubzt1jWrKhaxXr40RL41vzFuIn7x1Sasa3p%2F9Xo%3D&amp;res
> erved=0 .
> >
> > For removing workaround on those chips. Add new i.mx6ul type.
> >
> > Signed-off-by: Robin Gong <yibin.gong@nxp.com>
> > Acked-by: Mark Brown <broonie@kernel.org>
> > ---
> >  drivers/spi/spi-imx.c | 47
> > +++++++++++++++++++++++++++++++++++++++++++----
> >  1 file changed, 43 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index
> > cf235b9..d18ee25 100644
> > --- a/drivers/spi/spi-imx.c
> > +++ b/drivers/spi/spi-imx.c
> > @@ -59,6 +59,7 @@ enum spi_imx_devtype {
> >  	IMX35_CSPI,	/* CSPI on all i.mx except above */
> >  	IMX51_ECSPI,	/* ECSPI on i.mx51 */
> >  	IMX53_ECSPI,	/* ECSPI on i.mx53 and later */
> > +	IMX6UL_ECSPI,	/* ERR009165 fix from i.mx6ul */
> 
> This patch could be a lot smaller if you didn't introduce a new devtype. You
> could just use the IMX51_ECSPI in imx6ul_ecspi_devtype_data, as all you care
> about as a relevant difference is the tx_glitch_fixed property, which isn't tied
> to the devtype.
I knew tx_glitch_fixed was enough but I still prefer to add new 'IMX6UL_ECSPI' because
we can clearly choose the right IP which has fix the issue while legacy IMX51 if it's not
fixed by dts. 

> >  };
> >
> >  struct spi_imx_data;
> > @@ -78,6 +79,11 @@ struct spi_imx_devtype_data {
> >  	bool has_slavemode;
> >  	unsigned int fifo_size;
> >  	bool dynamic_burst;
> > +	/*
> > +	 * ERR009165 fixed or not:
> > +	 *
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.n
> xp.com%2Fdocs%2Fen%2Ferrata%2FIMX6DQCE.pdf&amp;data=04%7C01%7C
> yibin.gong%40nxp.com%7C48156bc93dc84ac26e9d08d942bdc0ac%7C686ea
> 1d3bc2b4c6fa92cd99c5c301635%7C0%7C1%7C637614205017900475%7CU
> nknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6
> Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=J9iZb93uN1VEriN%2F2GAE
> TWxdv4n%2FD6ZXteMCFkB8KHM%3D&amp;reserved=0
> > +	 */
> > +	bool tx_glitch_fixed;
> >  	enum spi_imx_devtype devtype;
> >  };
> >
> > @@ -134,6 +140,11 @@ static inline int is_imx51_ecspi(struct spi_imx_data
> *d)
> >  	return d->devtype_data->devtype == IMX51_ECSPI;  }
> >
> > +static inline int is_imx6ul_ecspi(struct spi_imx_data *d) {
> > +	return d->devtype_data->devtype == IMX6UL_ECSPI; }
> > +
> >  static inline int is_imx53_ecspi(struct spi_imx_data *d)  {
> >  	return d->devtype_data->devtype == IMX53_ECSPI; @@ -593,8 +604,14
> @@
> > static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
> >  	ctrl |= mx51_ecspi_clkdiv(spi_imx, t->speed_hz, &clk);
> >  	spi_imx->spi_bus_clk = clk;
> >
> > -	/* ERR009165: work in XHC mode as PIO */
> > -	ctrl &= ~MX51_ECSPI_CTRL_SMC;
> > +	/*
> > +	 * ERR009165: work in XHC mode instead of SMC as PIO on the chips
> > +	 * before i.mx6ul.
> > +	 */
> > +	if (spi_imx->usedma && spi_imx->devtype_data->tx_glitch_fixed)
> > +		ctrl |= MX51_ECSPI_CTRL_SMC;
> > +	else
> > +		ctrl &= ~MX51_ECSPI_CTRL_SMC;
> >
> >  	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
> >
> > @@ -620,12 +637,16 @@ static int mx51_ecspi_prepare_transfer(struct
> > spi_imx_data *spi_imx,
> >
> >  static void mx51_setup_wml(struct spi_imx_data *spi_imx)  {
> > +	u32 tx_wml = 0;
> > +
> > +	if (spi_imx->devtype_data->tx_glitch_fixed)
> > +		tx_wml = spi_imx->wml;
> >  	/*
> >  	 * Configure the DMA register: setup the watermark
> >  	 * and enable DMA request.
> >  	 */
> >  	writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
> > -		MX51_ECSPI_DMA_TX_WML(0) |
> > +		MX51_ECSPI_DMA_TX_WML(tx_wml) |
> >  		MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
> >  		MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
> >  		MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
> @@ -1019,6
> > +1040,23 @@ static struct spi_imx_devtype_data
> imx53_ecspi_devtype_data = {
> >  	.devtype = IMX53_ECSPI,
> >  };
> >
> > +static struct spi_imx_devtype_data imx6ul_ecspi_devtype_data = {
> > +	.intctrl = mx51_ecspi_intctrl,
> > +	.prepare_message = mx51_ecspi_prepare_message,
> > +	.prepare_transfer = mx51_ecspi_prepare_transfer,
> > +	.trigger = mx51_ecspi_trigger,
> > +	.rx_available = mx51_ecspi_rx_available,
> > +	.reset = mx51_ecspi_reset,
> > +	.setup_wml = mx51_setup_wml,
> > +	.fifo_size = 64,
> > +	.has_dmamode = true,
> > +	.dynamic_burst = true,
> > +	.has_slavemode = true,
> > +	.tx_glitch_fixed = true,
> > +	.disable = mx51_ecspi_disable,
> > +	.devtype = IMX6UL_ECSPI,
> > +};
> > +
> >  static const struct of_device_id spi_imx_dt_ids[] = {
> >  	{ .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
> >  	{ .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data,
> > }, @@ -1027,6 +1065,7 @@ static const struct of_device_id spi_imx_dt_ids[]
> = {
> >  	{ .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
> >  	{ .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
> >  	{ .compatible = "fsl,imx53-ecspi", .data =
> > &imx53_ecspi_devtype_data, },
> > +	{ .compatible = "fsl,imx6ul-ecspi", .data =
> > +&imx6ul_ecspi_devtype_data, },
> >  	{ /* sentinel */ }
> >  };
> >  MODULE_DEVICE_TABLE(of, spi_imx_dt_ids); @@ -1604,7 +1643,7 @@
> static
> > int spi_imx_probe(struct platform_device *pdev)
> >  	spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA |
> SPI_CS_HIGH \
> >  					     | SPI_NO_CS;
> >  	if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
> > -	    is_imx53_ecspi(spi_imx))
> > +	    is_imx53_ecspi(spi_imx) || is_imx6ul_ecspi(spi_imx))
> >  		spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY;
> >
> >  	spi_imx->spi_drctl = spi_drctl;
>