linux-kernel - Re: [PATCH 3/7] arm64: dts: qcom: sc8180x: create common zap-shader node

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Message-ID: <3cn67vhygwbqcjsmiesgskxzindatoiuyrukmoqgueqoej5qgj@ca66omtjzsip>
Date: Sat, 1 Nov 2025 12:04:27 -0500
From: Bjorn Andersson <andersson@...nel.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
	Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	cros-qcom-dts-watchers@...omium.org, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] arm64: dts: qcom: sc8180x: create common zap-shader
 node

On Fri, Oct 31, 2025 at 10:30:17AM +0100, Konrad Dybcio wrote:
> On 10/30/25 7:45 PM, Bjorn Andersson wrote:
> > On Thu, Oct 30, 2025 at 07:58:46PM +0200, Dmitry Baryshkov wrote:
> >> On Thu, Oct 30, 2025 at 12:28:31PM -0500, Bjorn Andersson wrote:
> >>> On Thu, Oct 30, 2025 at 11:59:00AM +0100, Konrad Dybcio wrote:
> >>>> On 10/30/25 11:58 AM, Konrad Dybcio wrote:
> >>>>> On 10/28/25 10:00 PM, Dmitry Baryshkov wrote:
> >>>>>> In order to reduce duplication, move common GPU memory configuration
> >>>>>> from individual board files to sc8180x.dtsi.
> >>>>>>
> >>>>>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> >>>>>> ---
> >>>>>
> >>>>> [...]
> >>>>>
> >>>>>> diff --git a/arch/arm64/boot/dts/qcom/sc8180x-primus.dts b/arch/arm64/boot/dts/qcom/sc8180x-primus.dts
> >>>>>> index 93de9fe918ebdadf239832db647b84ac9d5a33f6..069953dcad378448800d45e14931efe1fe1a69fc 100644
> >>>>>> --- a/arch/arm64/boot/dts/qcom/sc8180x-primus.dts
> >>>>>> +++ b/arch/arm64/boot/dts/qcom/sc8180x-primus.dts
> >>>>>> @@ -14,6 +14,8 @@
> >>>>>>  #include "sc8180x.dtsi"
> >>>>>>  #include "sc8180x-pmics.dtsi"
> >>>>>>  
> >>>>>> +/delete-node/ &gpu_mem;
> >>>
> >>> I agree with your hmm, seems this line should be dropped(?)
> >>>
> >>> Dmitry, please confirm and I can fix it up as I'm applying the series.
> >>
> >> Oh, and this line is necessary, because sc8180x-primus has its own
> >> location for the gpu_mem.
> >>
> > 
> > Hmm, you're right, not sure why the memory map differs... But this looks
> > good then.
> 
> The latest memory map for 8180 says:
> 
> GPU micro-code @ 0x98715000, 0x2000-long
> (matching the Flex 5G)
> 
> Across all the revisions, Primus's range is either part of a
> "reserved" region, or the CDSP's memory.
> 
> So it's either wrong or OEM-modified, with the latter being rather
> an odd thing given it's a CRD..
> 

I have a faint memory of having issues placing that region, so I might
be that I just winged it on the primus...

Perhaps it doesn't need to be different, if so that's a separate change.

Regards,
Bjorn