linux-kernel - Re: [PATCH v2 15/22] wifi: ath12k: add BDF address in hardware parameter

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Message-ID: <30e5d714-2e52-4a0e-9dc8-b6cacf6ad382@quicinc.com>
Date: Fri, 6 Dec 2024 10:04:25 +0530
From: Raj Kumar Bhagat <quic_rajkbhag@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        <ath12k@...ts.infradead.org>
CC: <linux-wireless@...r.kernel.org>, Kalle Valo <kvalo@...nel.org>,
        "Rob
 Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>,
        Jeff Johnson <jjohnson@...nel.org>,
        "Bjorn
 Andersson" <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v2 15/22] wifi: ath12k: add BDF address in hardware
 parameter

On 12/5/2024 11:12 PM, Konrad Dybcio wrote:
> On 3.12.2024 10:18 AM, Raj Kumar Bhagat wrote:
>> On 11/4/2024 7:46 PM, Konrad Dybcio wrote:
>>> On 15.10.2024 8:26 PM, Raj Kumar Bhagat wrote:
>>>> The Ath2k AHB device (IPQ5332) firmware requests BDF_MEM_REGION_TYPE
>>>> memory during QMI memory requests. This memory is part of the
>>>> HOST_DDR_REGION_TYPE. Therefore, add the BDF memory address to the
>>>> hardware parameter and provide this memory address to the firmware
>>>> during QMI memory requests.
>>>
>>> Sounds like something to put in the device tree, no?
>>>
>>
>> This BDF memory address is the RAM offset. We did add this in device tree in
>> version 1. This is removed from device tree in v2 based on the review comment that
>> DT should not store RAM offset.
>>
>> refer below link:
>> Link: https://lore.kernel.org/all/f8cd9c3d-47e1-4709-9334-78e4790acef0@kernel.org/
> 
> Right, I think this could be something under /reserved-memory instead
> 

Thanks for the suggestion. However, the BDF_MEM_REGION_TYPE is already within the
memory reserved for HOST_DDR_REGION_TYPE through /reserved-memory. Therefore, reserving
the memory for BDF_MEM_REGION_TYPE again in the Device Tree (DT) will cause a warning
for 'overlapping memory reservation'.