linux-kernel - Re: [PATCH 07/11] spi: dw: update NDF while writing in enhanced spi mode

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Date:   Sat, 27 Aug 2022 01:54:42 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Sudip Mukherjee <sudip.mukherjee@...ive.com>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        greentime.hu@...ive.com, jude.onyenegecha@...ive.com,
        william.salmon@...ive.com, adnan.chowdhury@...ive.com,
        ben.dooks@...ive.com, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        jeegar.lakhani@...ive.com
Subject: Re: [PATCH 07/11] spi: dw: update NDF while writing in enhanced spi
 mode

On Tue, Aug 02, 2022 at 06:57:51PM +0100, Sudip Mukherjee wrote:
> If the transfer of Transmit only mode is using dual/quad/octal SPI then
> NDF needs to be updated with the number of data frames.
> If the Transmit FIFO goes empty in-between, DWC_ssi masks the serial
> clock and wait for rest of the data until the programmed amount of
> frames are transferred successfully.
> 
> Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ive.com>
> ---
>  drivers/spi/spi-dw-core.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
> index 9d499bdf2ce6..8cb30540ad5b 100644
> --- a/drivers/spi/spi-dw-core.c
> +++ b/drivers/spi/spi-dw-core.c
> @@ -344,7 +344,9 @@ void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi,
>  	dw_writel(dws, DW_SPI_CTRLR0, cr0);
>  
>  	if (cfg->tmode == DW_SPI_CTRLR0_TMOD_EPROMREAD ||
> -	    cfg->tmode == DW_SPI_CTRLR0_TMOD_RO)
> +	    cfg->tmode == DW_SPI_CTRLR0_TMOD_RO ||

> +	    (cfg->tmode == DW_SPI_CTRLR0_TMOD_TO &&
> +	     (dws->caps & DW_SPI_CAP_EXT_SPI) && cfg->spi_frf))

just (cfg->spi_frf != DW_SPI_CTRLR0_SPI_FRF_STD_SPI &&
      cfg->tmode == DW_SPI_CTRLR0_TMOD_TO)

>  		dw_writel(dws, DW_SPI_CTRLR1, cfg->ndf ? cfg->ndf - 1 : 0);
>  
>  	/* Note DW APB SSI clock divider doesn't support odd numbers */
> @@ -760,6 +762,8 @@ static int dw_spi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
>  		cfg.ndf = op->data.nbytes;
>  	} else {
>  		cfg.tmode = DW_SPI_CTRLR0_TMOD_TO;

> +		if (enhanced_spi)
> +			cfg.ndf = op->data.nbytes;

This shall be moved to the Enhanced SPI-specific mem-op execution method:
dw_spi_exec_enh_mem_op().

-Sergey

>  	}
>  
>  	dw_spi_enable_chip(dws, 0);
> -- 
> 2.30.2
>