netdev - Re: [PATCH] can: m_can: m_can_platform: Fix iomap_read_fifo() and iomap_write

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Date:   Mon, 20 Sep 2021 17:57:26 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     unlisted-recipients:; (no To-header on input)
CC:     Lokesh Vutla <lokeshvutla@...com>,
        Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matt Kline <matt@...bashing.io>, <linux-can@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] can: m_can: m_can_platform: Fix iomap_read_fifo() and
 iomap_write_fifo()

Hi all,

On 20/09/21 5:56 pm, Aswath Govindraju wrote:
> The read an writes from the fifo are from a buffer with various fields and
> data at predefined offsets. So, they reads and writes should not be done to
> the same address(or port) in case of val_count greater than 1. Therefore,
> fix this by using iowrite32/ioread32 instead of ioread32_rep/iowrite32_rep.
> 
> Also, the write into fifo must be performed with an offset from the message
> ram base address. Therefore, fix the base address to mram_base.
> 
> Fixes: e39381770ec9 ("can: m_can: Disable IRQs on FIFO bus errors")
> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> ---

Please ignore this patch sent it my mistake. Sorry for the inconvenience.

Thanks,
Aswath

>  drivers/net/can/m_can/m_can_platform.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
> index 308d4f2fff00..eee47bad0592 100644
> --- a/drivers/net/can/m_can/m_can_platform.c
> +++ b/drivers/net/can/m_can/m_can_platform.c
> @@ -32,8 +32,13 @@ static u32 iomap_read_reg(struct m_can_classdev *cdev, int reg)
>  static int iomap_read_fifo(struct m_can_classdev *cdev, int offset, void *val, size_t val_count)
>  {
>  	struct m_can_plat_priv *priv = cdev_to_priv(cdev);
> +	void __iomem *src = priv->mram_base + offset;
>  
> -	ioread32_rep(priv->mram_base + offset, val, val_count);
> +	while (val_count--) {
> +		*(unsigned int *)val = ioread32(src);
> +		val += 4;
> +		src += 4;
> +	}
>  
>  	return 0;
>  }
> @@ -51,8 +56,13 @@ static int iomap_write_fifo(struct m_can_classdev *cdev, int offset,
>  			    const void *val, size_t val_count)
>  {
>  	struct m_can_plat_priv *priv = cdev_to_priv(cdev);
> +	void __iomem *dst = priv->mram_base + offset;
>  
> -	iowrite32_rep(priv->base + offset, val, val_count);
> +	while (val_count--) {
> +		iowrite32(*(unsigned int *)val, dst);
> +		val += 4;
> +		dst += 4;
> +	}
>  
>  	return 0;
>  }
>