linux-kernel - Re: [PATCH] fpga: altera-cvp: Truncated bitstream error support

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Date:   Sat, 28 May 2022 20:05:03 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     tien.sung.ang@...el.com
Cc:     mdf@...nel.org, hao.wu@...el.com, trix@...hat.com,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fpga: altera-cvp: Truncated bitstream error support

On Thu, May 19, 2022 at 05:39:07PM +0800, tien.sung.ang@...el.com wrote:
> Thanks for bringing this up. Yes, you are right that the fpga_mgr sees this
> as an error irrespective of the value. The CvP driver is changed now to just
> indicate the correct error which recommends a retry. To me understanding,
> EAGAIN was this. The fpga manager now looks like is going to return a CvP
> failure in short. 
> A BUSY state does not seem to be able to solve this issue. 
> Even an extended time-out didn't resolve this error state. The current time-out
> is set to 10seconds.   
> However, the main objective is to also handle the error if the CvP firmware
> is not responsive. The error_path flow is to reset the CVP mode and HIP_CLK_SEL bit

Please add your main objective to commit message.

Thanks,
Yilun

> as recommended by the firmware engineers. 
> The flow prescribed here is also an identical copy of working CvP driver 
> which is also owned by Intel. This driver is a downstream driver which is 
> not part of the Linux kernel. We are now porting this differences over to 
> the current upstream CvP driver.