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

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Date:   Thu, 16 Apr 2020 08:06:17 +0000
From:   "Wu, Hao" <hao.wu@...el.com>
To:     "Xu, Yilun" <yilun.xu@...el.com>,
        "mdf@...nel.org" <mdf@...nel.org>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "trix@...hat.com" <trix@...hat.com>,
        "bhu@...hat.com" <bhu@...hat.com>,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        "Xu, Yilun" <yilun.xu@...el.com>
Subject: RE: [PATCH 2/2] fpga: dfl: fix bug in port reset handshake

> -----Original Message-----
> From: linux-fpga-owner@...r.kernel.org <linux-fpga-owner@...r.kernel.org>
> On Behalf Of Xu Yilun
> Sent: Thursday, April 16, 2020 11:12 AM
> To: mdf@...nel.org; linux-fpga@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Cc: trix@...hat.com; bhu@...hat.com; Matthew Gerlach
> <matthew.gerlach@...ux.intel.com>; Xu, Yilun <yilun.xu@...el.com>
> Subject: [PATCH 2/2] fpga: dfl: fix bug in port reset handshake
> 
> 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>

Thanks for catching this.

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 b0c3178..3fa2c59 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;
> --
> 2.7.4