linux-kernel - Re: [PATCH RFC 6/8] drm/msm: adreno: enable GMU bandwidth for A740 and A750

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Message-ID: <CAA8EJpoO6sE8noSvvn0s7bu4Vi6-3YZ=kuxnv4+Vn_MfM3hSaw@mail.gmail.com>
Date: Mon, 18 Nov 2024 16:39:38 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: neil.armstrong@...aro.org
Cc: Akhil P Oommen <quic_akhilpo@...cinc.com>, Viresh Kumar <vireshk@...nel.org>, 
	Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, 
	Konrad Dybcio <konradybcio@...nel.org>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Connor Abbott <cwabbott0@...il.com>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 6/8] drm/msm: adreno: enable GMU bandwidth for A740
 and A750

On Mon, 18 Nov 2024 at 15:43, Neil Armstrong <neil.armstrong@...aro.org> wrote:
>
> On 15/11/2024 15:39, Dmitry Baryshkov wrote:
> > On Fri, Nov 15, 2024 at 10:20:01AM +0100, Neil Armstrong wrote:
> >> On 15/11/2024 08:33, Dmitry Baryshkov wrote:
> >>> On Wed, Nov 13, 2024 at 04:48:32PM +0100, Neil Armstrong wrote:
> >>>> Now all the DDR bandwidth voting via the GPU Management Unit (GMU)
> >>>> is in place, let's declare the Bus Control Modules (BCMs) and
> >>>
> >>> s/let's //g
> >>>
> >>>> it's parameters in the GPU info struct and add the GMU_BW_VOTE
> >>>> quirk to enable it.
> >>>
> >>> Can we define a function that checks for info.bcm[0].name isntead of
> >>> adding a quirk?
> >>
> >> Probably, I'll need ideas to how design this better, perhaps a simple
> >> capability bitfield in a6xx_info ?
> >
> > I'm not sure if I follow the question. I think it's better to check for
> > the presens of the data rather than having a separate 'cap' bit in
> > addition to that data.
>
> I don't fully agree here, I just follow the other features (CACHED_COHERENT/APRIV/...)
> nothing fancy.
> I'll introduce a features bitfield, so we don't mix them with quirks

SGTM

>
> >
> >> There's other feature that are lacking, like ACD or BCL which are not supported
> >> on all a6xx/a7xx gpus.
> >
> > Akhil is currently working on ACD, as you have seen from the patches.
>
> Yep I've tested and reviewed the patches
>
> >
> >>
> >>>
> >>>>
> >>>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> >>>> ---
> >>>>    drivers/gpu/drm/msm/adreno/a6xx_catalog.c | 26 ++++++++++++++++++++++++--
> >>>>    1 file changed, 24 insertions(+), 2 deletions(-)
> >>>>
> >>>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> >>>> index 0c560e84ad5a53bb4e8a49ba4e153ce9cf33f7ae..014a24256b832d8e03fe06a6516b5348a5c0474a 100644
> >>>> --- a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> >>>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> >>>> @@ -1379,7 +1379,8 @@ static const struct adreno_info a7xx_gpus[] = {
> >>>>                    .inactive_period = DRM_MSM_INACTIVE_PERIOD,
> >>>>                    .quirks = ADRENO_QUIRK_HAS_CACHED_COHERENT |
> >>>>                              ADRENO_QUIRK_HAS_HW_APRIV |
> >>>> -                    ADRENO_QUIRK_PREEMPTION,
> >>>> +                    ADRENO_QUIRK_PREEMPTION |
> >>>> +                    ADRENO_QUIRK_GMU_BW_VOTE,
> >>>>                    .init = a6xx_gpu_init,
> >>>>                    .zapfw = "a740_zap.mdt",
> >>>>                    .a6xx = &(const struct a6xx_info) {
> >>>> @@ -1388,6 +1389,16 @@ static const struct adreno_info a7xx_gpus[] = {
> >>>>                            .pwrup_reglist = &a7xx_pwrup_reglist,
> >>>>                            .gmu_chipid = 0x7020100,
> >>>>                            .gmu_cgc_mode = 0x00020202,
> >>>> +                  .bcm = {
> >>>> +                          [0] = { .name = "SH0", .buswidth = 16 },
> >>>> +                          [1] = { .name = "MC0", .buswidth = 4 },
> >>>> +                          [2] = {
> >>>> +                                  .name = "ACV",
> >>>> +                                  .fixed = true,
> >>>> +                                  .perfmode = BIT(3),
> >>>> +                                  .perfmode_bw = 16500000,
> >>>
> >>> Is it a platform property or GPU / GMU property? Can expect that there
> >>> might be several SoCs having the same GPU, but different perfmode_bw
> >>> entry?
> >>
> >> I presume this is SoC specific ? But today the XXX_build_bw_table() are
> >> already SoC specific, so where should this go ?
> >
> > XXX_build_bw_table() are GPU-specific. There are cases of several SoCs
> > sharing the same GPU on them.
>
> So it's gpu-specific
>
> >
> >> Downstream specifies this in the adreno-gpulist.h, which is the equivalent
> >> here.
> >
>


-- 
With best wishes
Dmitry