linux-kernel - Re: [PATCH V2 2/2] efi/fb: Convert PCI bus address to resource if translated by the bridge

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Message-ID: <d8f060ec-bc58-666d-7f2f-b3732ef2fa46@codeaurora.org>
Date:   Mon, 25 Jun 2018 13:31:29 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        "open list:EFIFB FRAMEBUFFER DRIVER" <linux-fbdev@...r.kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-arm-msm@...r.kernel.org, Timur Tabi <timur@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <dri-devel@...ts.freedesktop.org>,
        Peter Jones <pjones@...hat.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V2 2/2] efi/fb: Convert PCI bus address to resource if
 translated by the bridge

On 6/25/2018 1:29 PM, Ard Biesheuvel wrote:
>>> Platform has been doing mmio translation for quite a while. Because all accesses go through pci io protocol, the rest of the UEFI never needed to be aware of bar address or do direct access.
>>>
>>> This is the first time I hear of direct access. Maybe, GOP is a special case.
>>>
>>> I started copying your response to the bios vendor.
>>>
>>> They are probably missing that patch. I will pass it along.
>> I was informed that they fixed the issue in BIOS by presenting CPU physical
>> address instead of PCI bus address in FrameBufferBase of the AST GOP UEFI driver.
>>
>> We can drop this patch now.
>>
> Excellent! Thanks for following up with the vendor ...
> 

Sure, appreciate the help.

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.