linux-kernel - Re: [PATCH v3 3/5] arm64: dts: qcom: sdx75: update reserved memory regions for mpss

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Date: Mon, 24 Jun 2024 16:51:38 +0530
From: Naina Mehta <quic_nainmeht@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>, <andersson@...nel.org>,
        <mathieu.poirier@...aro.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <manivannan.sadhasivam@...aro.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-remoteproc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] arm64: dts: qcom: sdx75: update reserved memory
 regions for mpss



On 6/18/2024 7:08 PM, Konrad Dybcio wrote:
> 
> 
> On 6/18/24 15:13, Naina Mehta wrote:
>> Rename qdss@...00000 memory region as qlink_logging memory region
>> and add qdss_mem memory region at address of 0x88500000.
>> Split mpss_dsmharq_mem region into 2 separate regions and
>> reduce the size of mpssadsp_mem region.
>>
>> Signed-off-by: Naina Mehta <quic_nainmeht@...cinc.com>
>> ---
> 
> Alright, we're getting somewhere. The commit message should however 
> motivate
> why such changes are necessary. For all we know, the splitting in two is
> currently done for no reason, as qdss_mem and qlink_logging_mem are 
> contiguous
> - does the firmware have some expectations about them being separate?
> 

Since different DSM region size is required for different modem 
firmware, mpss_dsmharq_mem region being split into 2 separate regions.
This would provide the flexibility to remove the region which is
not required for a particular platform.
qlink_logging is being added at the memory region at the address of
0x88800000 as the region is being used by modem firmware.

Regards,
Naina

> Konrad