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Date: Sat, 30 Sep 2017 17:31:06 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Ed Tomlinson <edt@aei.ca>
Cc: "Greg KH <gregkh@linuxfoundation.org>, Zhang, Jerry" 
        <Jerry.Zhang@amd.com>,
        linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        torvalds@linux-foundation.org, stable@vger.kernel.org, lwn@lwn.net,
        Jiri Slaby <jslaby@suse.cz>
Subject: Re: Linux 4.13.4
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On Sat, Sep 30, 2017 at 11:14:42AM -0400, Ed Tomlinson wrote:
> Hi
> 
> I did things old school via patch -R.  This is what I reverted:
> 
> ---
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
> index 4083be61b328..6417febe18b9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
> @@ -95,9 +95,8 @@ int psp_wait_for(struct psp_context *psp, uint32_t
> reg_index,
>        int i;
>        struct amdgpu_device *adev = psp->adev;
> 
> -       val = RREG32(reg_index);
> -
>        for (i = 0; i < adev->usec_timeout; i++) {
> +               val = RREG32(reg_index);
>                if (check_changed) {
>                        if (val != reg_val)
>                                return 0;
> diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c
> b/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c
> index c98d77d0c8f8..6f80ad8f588b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c
> +++ b/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c
> @@ -237,11 +237,9 @@ int psp_v3_1_bootloader_load_sos(struct psp_context
> *psp)
> 
>        /* there might be handshake issue with hardware which needs delay */
>        mdelay(20);
> -#if 0
>        ret = psp_wait_for(psp, SOC15_REG_OFFSET(MP0, 0,
> mmMP0_SMN_C2PMSG_81),
>                           RREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_81),
>                           0, true);
> -#endif
> 
>        return ret;
> }
> ---

Any chance to dig out _which_ patch this was?  I don't have access to my
tree at the moment...

And what about 4.14-rc2?

thanks,

greg k-h