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

From: Lucas Stach <l.stach@pengutronix.de>
To: Robin Gong <yibin.gong@nxp.com>,
	vkoul@kernel.org, mark.rutland@arm.com, broonie@kernel.org,
	robh+dt@kernel.org, catalin.marinas@arm.com, will.deacon@arm.com,
	shawnguo@kernel.org, festevam@gmail.com, s.hauer@pengutronix.de,
	martin.fuzzey@flowbird.group, u.kleine-koenig@pengutronix.de,
	dan.j.williams@intel.com, matthias.schiffer@ew.tq-group.com,
	frieder.schrempf@kontron.de, m.felsch@pengutronix.de,
	xiaoning.wang@nxp.com
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-spi@vger.kernel.org, linux-imx@nxp.com,
	kernel@pengutronix.de, dmaengine@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v14 08/12] spi: imx: remove ERR009165 workaround on i.mx6ul
Date: Fri, 09 Jul 2021 11:41:35 +0200	[thread overview]
Message-ID: <dfa12f89f112966197518aa8df25cb47d69b30f7.camel@pengutronix.de> (raw)
In-Reply-To: <1617809456-17693-9-git-send-email-yibin.gong@nxp.com>

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://www.nxp.com/ .
> 
> 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.

Regards,
Lucas

>  };
>  
>  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://www.nxp.com/docs/en/errata/IMX6DQCE.pdf
> +	 */
> +	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;