linux-kernel - Re: [PATCH v3 3/3] fpga: microchip-spi: separate data frame write routine

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Date:   Wed, 28 Dec 2022 14:54:37 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Ivan Bornyakov <i.bornyakov@...rotek.ru>
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
        Xu Yilun <yilun.xu@...el.com>, Tom Rix <trix@...hat.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        system@...rotek.ru
Subject: Re: [PATCH v3 3/3] fpga: microchip-spi: separate data frame write
 routine

On Tue, Dec 27, 2022 at 01:04:50PM +0300, Ivan Bornyakov wrote:
> mpf_ops_write() function writes bitstream data to the FPGA by a smaller
> frames. Introduce mpf_spi_frame_write() function which is for writing a
> single data frame and use it in mpf_ops_write().
> 
> No functional changes intended.
> 
> Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>

Acked-by: Conor Dooley <conor.dooley@...rochip.com>

Without another user for the new function I'm not super pushed, but I
suppose it does make things a little more readable.

Thanks,
Conor.

> ---
>  drivers/fpga/microchip-spi.c | 36 +++++++++++++++++++++++-------------
>  1 file changed, 23 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/fpga/microchip-spi.c b/drivers/fpga/microchip-spi.c
> index 8d1d9476d0cc..ea92e5d106fa 100644
> --- a/drivers/fpga/microchip-spi.c
> +++ b/drivers/fpga/microchip-spi.c
> @@ -274,9 +274,30 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
>  	return 0;
>  }
>  
> +static int mpf_spi_frame_write(struct mpf_priv *priv, const char *buf)
> +{
> +	struct spi_transfer xfers[2] = {
> +		{
> +			.tx_buf = &priv->tx,
> +			.len = 1,
> +		}, {
> +			.tx_buf = buf,
> +			.len = MPF_SPI_FRAME_SIZE,
> +		},
> +	};
> +	int ret;
> +
> +	ret = mpf_poll_status(priv, 0);
> +	if (ret < 0)
> +		return ret;
> +
> +	priv->tx = MPF_SPI_FRAME;
> +
> +	return spi_sync_transfer(priv->spi, xfers, ARRAY_SIZE(xfers));
> +}
> +
>  static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count)
>  {
> -	struct spi_transfer xfers[2] = { 0 };
>  	struct mpf_priv *priv = mgr->priv;
>  	struct device *dev = &mgr->dev;
>  	int ret, i;
> @@ -287,19 +308,8 @@ static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count
>  		return -EINVAL;
>  	}
>  
> -	xfers[0].tx_buf = &priv->tx;
> -	xfers[0].len = 1;
> -
>  	for (i = 0; i < count / MPF_SPI_FRAME_SIZE; i++) {
> -		xfers[1].tx_buf = buf + i * MPF_SPI_FRAME_SIZE;
> -		xfers[1].len = MPF_SPI_FRAME_SIZE;
> -
> -		ret = mpf_poll_status(priv, 0);
> -		if (ret >= 0) {
> -			priv->tx = MPF_SPI_FRAME;
> -			ret = spi_sync_transfer(priv->spi, xfers, ARRAY_SIZE(xfers));
> -		}
> -
> +		ret = mpf_spi_frame_write(priv, buf + i * MPF_SPI_FRAME_SIZE);
>  		if (ret) {
>  			dev_err(dev, "Failed to write bitstream frame %d/%zu\n",
>  				i, count / MPF_SPI_FRAME_SIZE);
> -- 
> 2.38.2
> 
> 

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