linux-kernel - [PATCH v2 04/11] drm/msm: adreno: add GMU_BW

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Message-Id: <20241119-topic-sm8x50-gpu-bw-vote-v2-4-4deb87be2498@linaro.org>
Date: Tue, 19 Nov 2024 18:56:39 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: 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>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 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>
Cc: 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, Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v2 04/11] drm/msm: adreno: add GMU_BW_VOTE feature flag

The Adreno GMU Management Unit (GNU) can also scale the DDR Bandwidth
along the Frequency and Power Domain level, but by default we leave the
OPP core vote for the interconnect ddr path.

While scaling via the interconnect path was sufficient, newer GPUs
like the A750 requires specific vote paremeters and bandwidth to
achieve full functionality.

While the feature will require some data in a6xx_info, it's safer
to only enable tested platforms with this flag first.

Add a new feature enabling DDR Bandwidth vote via GMU.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index 4702d4cfca3b58fb3cbb25cb6805f1c19be2ebcb..394b96eb6c83354ae008b15b562bedb96cd391dd 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -58,6 +58,7 @@ enum adreno_family {
 #define ADRENO_FEAT_HAS_HW_APRIV		BIT(0)
 #define ADRENO_FEAT_HAS_CACHED_COHERENT		BIT(1)
 #define ADRENO_FEAT_PREEMPTION			BIT(2)
+#define ADRENO_FEAT_GMU_BW_VOTE			BIT(3)

 /* Helper for formating the chip_id in the way that userspace tools like
  * crashdec expect.

-- 
2.34.1