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

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

On 12/07/21 17:31 Lucas Stach <l.stach@pengutronix.de> wrote: 
> Am Montag, dem 12.07.2021 um 03:48 +0000 schrieb Robin Gong:
> > 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%2Fww
> > > w.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.
> >
> Sorry, I don't follow this reasoning. You are not using the new IMX6UL_ECSPI
> devtype in any way in this patch, other than a single location, where you just
> handle it the same as the IMX51_ECSPI devtype.
Okay, will reuse IMX51_ECSPI as devtype, but will still keep "fsl,imx6ul-ecspi".

> 
> >
> >
> > > >  };
> > > >
> > > >  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%2Fww
> > > w.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;
> > >
> >
>