linux-kernel - Re: [RESEND PATCH 2/2] fpga: dfl: fix bug in port reset handshake

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Date:   Thu, 9 Jul 2020 06:20:42 -0700
From:   Tom Rix <trix@...hat.com>
To:     Xu Yilun <yilun.xu@...el.com>, mdf@...nel.org,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     lgoncalv@...hat.com,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Subject: Re: [RESEND PATCH 2/2] fpga: dfl: fix bug in port reset handshake


On 7/9/20 1:12 AM, Xu Yilun wrote:
> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
>
> When putting the port in reset, driver must wait for the soft reset
> acknowledgment bit instead of the soft reset bit.
>
> Fixes: 47c1b19c160f (fpga: dfl: afu: add port ops support)
> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> Acked-by: Wu Hao <hao.wu@...el.com>
> ---
>  drivers/fpga/dfl-afu-main.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
> index 7c84fee..753cda4 100644
> --- a/drivers/fpga/dfl-afu-main.c
> +++ b/drivers/fpga/dfl-afu-main.c
> @@ -83,7 +83,8 @@ int __afu_port_disable(struct platform_device *pdev)
>  	 * on this port and minimum soft reset pulse width has elapsed.
>  	 * Driver polls port_soft_reset_ack to determine if reset done by HW.
>  	 */
> -	if (readq_poll_timeout(base + PORT_HDR_CTRL, v, v & PORT_CTRL_SFTRST,
> +	if (readq_poll_timeout(base + PORT_HDR_CTRL, v,
> +			       v & PORT_CTRL_SFTRST_ACK,
>  			       RST_POLL_INVL, RST_POLL_TIMEOUT)) {
>  		dev_err(&pdev->dev, "timeout, fail to reset device\n");
>  		return -ETIMEDOUT;

Looks ok to me.

Reviewed-by: Tom Rix <trix@...hat.com>