On Thu, Apr 16, 2026 at 04:43:47PM +0300, Erikas Bitovtas wrote:
> This patch series adds support for Venus on MSM8939. It is mostly
> similar to MSM8916 Venus, except it needs two additional cores to be
> powered on before it can start decoding.
>
> This patch series is marked as an RFC. Before submitting a non-RFC
> series, I would like to have some details clarified regarding how Venus
> works in order to improve and eventually upstream support for MSM8939.
>
> 1. In downstream, particularly in LA.BR.1.2.9.1_rb1.5, the buses
> for vcodec0 cores have only decoding bits enabled, as depicted
> by qcom,bus-configs property of qcom,msm-bus-clients children
> in qcom,vidc node. Do I understand correctly that these cores
> are only needed for decoding, and not for encoding?
> 2. Currently in device tree there is a video-decoder subnode for Venus
> node, however, for SDM845-v2 (and newer) chipsets, Venus does not use
> subnodes. Does this mean it should be dropped for MSM8939 as well?
> 3. MSM8939 supports HEVC decoding, however, as the patchset is written
> now, it does not work. It can be enabled, however, it will result in
> breakage of Venus for faulty MSM8916 firmwares, because the code
> disabling HEVC for HFI v1 needs to be removed, and as per commit
> c50cc6dc6c48 ("media: venus: hfi_parser: Ignore HEVC encoding for V1"),
> this would break support for some MSM8916 devices. What could be the
> best way to work around this?
> 4. To attach vcodec0 power domain list to dev_{dec,enc}, I had to move
> vdec_get and venc_get later in the probe. Should this be avoided, and
> is there a better way to attach vcodec power domains?
>
> There may be some other issues with this patchset - this is WIP code, so
> feedback is very appreciated. Thank you!
for the next iteration, could you please also include fluster results
for the codecs supported by it (VP8, H.264) and also v4l2-compliance
results?
>
> Signed-off-by: Erikas Bitovtas <[email protected]>
> ---
> André Apitzsch (4):
> media: dt-bindings: venus: Add qcom,msm8939 schema
> media: venus: core: Add msm8939 resource struct
> arm64: dts: qcom: msm8939: Add venus node
> arm64: dts: qcom: msm8939-longcheer-l9100: Enable venus node
>
> Erikas Bitovtas (6):
> media: venus: add pmdomains to the struct based on the purpose of cores
> arm64: dts: qcom: msm8939-asus-z00t: add Venus
> clk: qcom: gcc-msm8939: mark Venus core GDSCs as hardware controlled
> media: venus: move getting vdec and venc for later
> media: qcom: venus: Move HFI v3 venc and vdec methods to HFI v1
> media: venus: add power domain enable logic for Venus cores
>
> .../bindings/media/qcom,msm8939-venus.yaml | 104 ++++++++++++
> arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts | 8 +
> .../boot/dts/qcom/msm8939-longcheer-l9100.dts | 8 +
> arch/arm64/boot/dts/qcom/msm8939.dtsi | 24 +++
> drivers/clk/qcom/gcc-msm8939.c | 4 +
> drivers/media/platform/qcom/venus/core.c | 39 +++++
> drivers/media/platform/qcom/venus/core.h | 8 +
> drivers/media/platform/qcom/venus/pm_helpers.c | 187
> ++++++++++++++++++---
> drivers/media/platform/qcom/venus/vdec.c | 12 +-
> drivers/media/platform/qcom/venus/venc.c | 12 +-
> 10 files changed, 374 insertions(+), 32 deletions(-)
> ---
> base-commit: 936c21068d7ade00325e40d82bfd2f3f29d9f659
> change-id: 20260416-msm8939-venus-rfc-c025c4c74fae
>
> Best regards,
> --
> Erikas Bitovtas <[email protected]>
>
--
With best wishes
Dmitry
