linux-kernel - Re: [PATCH v2 5/7] drm/msm/adreno: Add A702 support

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Date: Thu, 6 Jun 2024 11:27:34 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Connor Abbott <cwabbott0@...il.com>
Cc: Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Joerg Roedel <joro@...tes.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Clark <robdclark@...il.com>,
 Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
 linux-clk@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 freedreno@...ts.freedesktop.org
Subject: Re: [PATCH v2 5/7] drm/msm/adreno: Add A702 support

On 23.05.2024 2:14 PM, Connor Abbott wrote:
> On Fri, Feb 23, 2024 at 9:28 PM Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>
>> The A702 is a weird mix of 600 and 700 series.. Perhaps even a
>> testing ground for some A7xx features with good ol' A6xx silicon.
>> It's basically A610 that's been beefed up with some new registers
>> and hw features (like APRIV!), that was then cut back in size,
>> memory bus and some other ways.
>>
>> Add support for it, tested with QCM2290 / RB1.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---

[...]

>> +
>> +       if (adreno_is_a702(gpu)) {
>> +               gpu->ubwc_config.highest_bank_bit = 14;
>> +               gpu->ubwc_config.min_acc_len = 1;
>> +               gpu->ubwc_config.ubwc_mode = 2;
> 
> I just noticed, but this is wrong. ubwc_mode is a 1 bit field and what
> this is actually doing is overwriting hbb_lo, making the highest bank
> bit 15 instead of 14.

You're right, this should be a 0. Thanks!

Konrad