linux-kernel - Re: [RESENDPATCH v1 2/6] spi: cadence-quadspi: Disable the DAC for Intel LGM SoC

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Date:   Tue, 20 Oct 2020 19:13:37 +0530
From:   Pratyush Yadav <me@...avpratyush.com>
To:     "Ramuthevar,Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
Cc:     vigneshr@...com, tudor.ambarus@...rochip.com, broonie@...nel.org,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        miquel.raynal@...tlin.com, simon.k.r.goldschmidt@...il.com,
        dinguyen@...nel.org, richard@....at, cheol.yong.kim@...el.com,
        qi-ming.wu@...el.com
Subject: Re: [RESENDPATCH v1 2/6] spi: cadence-quadspi: Disable the DAC for
 Intel LGM SoC

On Tue, Oct 20 2020, Ramuthevar,Vadivel MuruganX wrote:

Hi,

> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>
> On Intel Lightning Mountain(LGM) SoCs QSPI controller do not use
> Direct Access Controller(DAC).
>
> This patch adds a quirk to disable the Direct Access Controller
> for data transfer instead it uses indirect data transfer.
>
> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> ---
>  drivers/spi/spi-cadence-quadspi.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
> index d7b10c46fa70..3d017b484114 100644
> --- a/drivers/spi/spi-cadence-quadspi.c
> +++ b/drivers/spi/spi-cadence-quadspi.c
> @@ -1106,6 +1106,13 @@ static void cqspi_controller_init(struct cqspi_st *cqspi)
>  	reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
>  	writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
>  
> +	/* Disable direct access controller */
> +	if (!cqspi->use_direct_mode) {
> +		reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
> +		reg &= ~CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
> +		writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
> +	}
> +
>  	cqspi_controller_enable(cqspi, 1);
>  }
>  
> @@ -1388,6 +1395,10 @@ static const struct cqspi_driver_platdata am654_ospi = {
>  	.quirks = CQSPI_NEEDS_WR_DELAY,
>  };
>  
> +static const struct cqspi_driver_platdata intel_lgm_qspi = {
> +	.quirks = CQSPI_DISABLE_DAC_MODE,
> +};
> +
>  static const struct of_device_id cqspi_dt_ids[] = {
>  	{
>  		.compatible = "cdns,qspi-nor",
> @@ -1403,6 +1414,7 @@ static const struct of_device_id cqspi_dt_ids[] = {
>  	},
>  	{
>  		.compatible = "intel,lgm-qspi",
> +		.data = &intel_lgm_qspi,
>  	},
>  	{ /* end of table */ }
>  };

-- 
Regards,
Pratyush Yadav