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drm/msm: Add support for the A750 GPU found on the SM8650 platform

Unlike the the very close A740 GPU on the SM8550 SoC, the A750 GPU
doesn't have an HWCFG block but a separate register set.

The missing registers are added in the a6xx.xml.h file that would
require a subsequent sync and the non-existent hwcfg is handled
in a6xx_set_hwcg().

The A750 GPU info are added under the adreno_is_a750() macro and
the ADRENO_7XX_GEN3 family id.

This adds:
- DT nodes

Dependencies: None

Tested using Mesa's main branch on the SM8650-QRD
and with kmscube & vkcube to test basic rendering.

To: Bjorn Andersson <andersson@kernel.org>
To: Konrad Dybcio <konrad.dybcio@linaro.org>
To: Rob Herring <robh@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
To: Conor Dooley <conor+dt@kernel.org>
Cc:  <linux-arm-msm@vger.kernel.org>
Cc:  <devicetree@vger.kernel.org>
Cc:  <linux-kernel@vger.kernel.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
---
Changes in v4:
- Dropped applied patches
- Added a few more OPPs that are safe on all SKUs
- Re-ordered the OPPs
- Link to v3: https://lore.kernel.org/r/20240216-topic-sm8650-gpu-v3-0-eb1f4b86d8d3@linaro.org

Changes in v3:
- Fixed smmu bindings if condition for GMU smmu
- Collected reviews
- Link to v2: https://lore.kernel.org/r/20240215-topic-sm8650-gpu-v2-0-6be0b4bf2e09@linaro.org

Changes in v2:
- Added separate a6xx.xml.h sync from https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27576
- Collected review tags
- Inlined skip_programming
- Use A7XX_RBBM_CGC_P2S_STATUS_TXDONE instead of BIT(0)
- Drop now useless placeholder comment
- Removed interconnect properties
- Rebased on current linux-next
- Link to v1: https://lore.kernel.org/r/20240212-topic-sm8650-gpu-v1-0-708a40b747b5@linaro.org

---
Neil Armstrong (2):
      arm64: dts: qcom: sm8650: add GPU nodes
      arm64: dts: qcom: sm8650-qrd: enable GPU

 arch/arm64/boot/dts/qcom/sm8650-qrd.dts |   8 ++
 arch/arm64/boot/dts/qcom/sm8650.dtsi    | 181 ++++++++++++++++++++++++++++++++
 2 files changed, 189 insertions(+)
---
base-commit: 2e93f143ca010a5013528e1cfdc895f024fe8c21
change-id: 20240208-topic-sm8650-gpu-489d5e2c2b17

Best regards,