linux-kernel - Re: [PATCH v2 07/15] spi: imx: remove ERR009165 workaround on i.mx6ul

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Message-ID: <1556269796.2584.25.camel@pengutronix.de>
Date:   Fri, 26 Apr 2019 11:09:56 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Robin Gong <yibin.gong@....com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "plyatov@...il.com" <plyatov@...il.com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 07/15] spi: imx: remove ERR009165 workaround on
 i.mx6ul

Am Freitag, den 26.04.2019, 08:05 +0000 schrieb Robin Gong:
>    ERR009165 fix on i.mx6ul and next chip, such as i.mx6ull/i.mx8mq/i.mx8mm.
> Remove workaround on those chips. Add new i.mx6ul type for that.
> 
> Signed-off-by: Robin Gong <yibin.gong@....com>
> ---
>  drivers/spi/spi-imx.c | 39 +++++++++++++++++++++++++++++++++++----
>  1 file changed, 35 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
> index eb56eac..2e5e978 100644
> --- a/drivers/spi/spi-imx.c
> +++ b/drivers/spi/spi-imx.c
> @@ -57,6 +57,7 @@ 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 */
>  };
>  
>  struct spi_imx_data;
> @@ -128,7 +129,8 @@ static inline int is_imx35_cspi(struct spi_imx_data *d)
>  
>  static inline int is_imx51_ecspi(struct spi_imx_data *d)
>  {
> -	return d->devtype_data->devtype == IMX51_ECSPI;
> +	return d->devtype_data->devtype == IMX51_ECSPI ||
> +	       d->devtype_data->devtype == IMX6UL_ECSPI;
>  }
>  
>  static inline int is_imx53_ecspi(struct spi_imx_data *d)
> @@ -585,9 +587,16 @@ 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 */
> -	if (spi_imx->usedma)
> -		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) {
> +		if (spi_imx->devtype_data->devtype == IMX6UL_ECSPI)

>=, otherwise the workaround might be applied to later generations of
the core if more are added later.

Regards,
Lucas