| Message ID | 20241113-topic-sm8x50-gpu-bw-vote-v1-2-3b8d39737a9b@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | drm/msm: adreno: add support for DDR bandwidth scaling via GMU | expand |
On Wed, Nov 13, 2024 at 04:48:28PM +0100, Neil Armstrong wrote: > 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. > > Add a new Quirk enabling DDR Bandwidth vote via GMU. Please describe, why this is defined as a quirk rather than a proper platform-level property. From my experience with 6xx and 7xx, all the platforms need to send some kind of BW data to the GMU. > > Signed-off-by: Neil Armstrong <neil.armstrong@linaro.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 e71f420f8b3a8e6cfc52dd1c4d5a63ef3704a07f..20b6b7f49473d42751cd4fb4fc82849be42cb807 100644 > --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h > +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h > @@ -57,6 +57,7 @@ enum adreno_family { > #define ADRENO_QUIRK_HAS_HW_APRIV BIT(3) > #define ADRENO_QUIRK_HAS_CACHED_COHERENT BIT(4) > #define ADRENO_QUIRK_PREEMPTION BIT(5) > +#define ADRENO_QUIRK_GMU_BW_VOTE BIT(6) > > /* Helper for formating the chip_id in the way that userspace tools like > * crashdec expect. > > -- > 2.34.1 >
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h index e71f420f8b3a8e6cfc52dd1c4d5a63ef3704a07f..20b6b7f49473d42751cd4fb4fc82849be42cb807 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h @@ -57,6 +57,7 @@ enum adreno_family { #define ADRENO_QUIRK_HAS_HW_APRIV BIT(3) #define ADRENO_QUIRK_HAS_CACHED_COHERENT BIT(4) #define ADRENO_QUIRK_PREEMPTION BIT(5) +#define ADRENO_QUIRK_GMU_BW_VOTE BIT(6) /* Helper for formating the chip_id in the way that userspace tools like * crashdec expect.
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. Add a new Quirk enabling DDR Bandwidth vote via GMU. Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> --- drivers/gpu/drm/msm/adreno/adreno_gpu.h | 1 + 1 file changed, 1 insertion(+)