Re: [PATCH v6 00/12] Unregister critical branch clocks + some RPM
From: Taniya Das
Date: Thu Jan 25 2024 - 05:18:32 EST
Hi Konrad,
Thanks for your patch.
On 1/13/2024 8:20 PM, Konrad Dybcio wrote:
On Qualcomm SoCs, certain branch clocks either need to be always-on, or
should be if you're interested in touching some part of the hardware.
Using CLK_IS_CRITICAL for this purpose sounds like a genius idea,
however that messes with the runtime pm handling - if a clock is
marked as such, the clock controller device will never enter the
"suspended" state, leaving the associated resources online, which in
turn breaks SoC-wide suspend.
I am really curious to know a little more about the SoC-Wide Suspend not
happening on these targets. Could you add more details here ?
The Resource Power Manager (RPM) is the main aggregator on these targets
where the active & sleep votes on XO, shared rails (CX/MX) decide the
SoC wide suspend. The High Level OS on our internal platforms never had
any suspend issues due to clocks(GCC/GPUCC) or shared rails being kept
enabled from the consumers.
This series aims to solve that on a couple SoCs that I could test the
changes on and it sprinkles some runtime pm enablement atop these drivers.
As CX is a shared resource/rail on these specific targets we definitely
do not achieve any power saving with the runtime pm attached to these
clock controllers, but I see a little more SW overhead. Though you could
please add your observations/comments.
Removing the CLK_IS_CRITICAL is a good cleanup and moving them to probe
is a good way to handle the always-on clocks.
Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
---
Changes in v6:
- Rebase (next-20240112)
- Reorder qcom_branch_set_clk_en calls by register in "*: Unregister
critical clocks" (Johan)
- Pick up tags
- Link to v5: https://lore.kernel.org/r/20230717-topic-branch_aon_cleanup-v5-0-99942e6bf1ba@xxxxxxxxxx
Changes in v5:
- Change the "Keep the critical clocks always-on" comment to "Keep
some clocks always-on"
- Add the same comment to commits unregistering clocks on 6115/6375/2290
- Link to v4: https://lore.kernel.org/r/20230717-topic-branch_aon_cleanup-v4-0-32c293ded915@xxxxxxxxxx
Changes in v4:
- Add and unify the "/* Keep the critical clocks always-on */" comment
- Rebase (next-20231222), also include 8650, X1E and 8280camcc drivers
- Drop enabling runtime PM on GCC
- Improve the commit message of "clk: qcom: gpucc-sm6115: Add runtime PM"
- Link to v3: https://lore.kernel.org/r/20230717-topic-branch_aon_cleanup-v3-0-3e31bce9c626@xxxxxxxxxx
Changes in v3:
- Rebase (next-20231219)
- Fix up a copypaste mistake in "gcc-sm6375: Unregister critical clocks" (bod)
- Pick up tags
- Link to v2: https://lore.kernel.org/r/20230717-topic-branch_aon_cleanup-v2-0-2a583460ef26@xxxxxxxxxx
Changes in v2:
- Rebase
- Pick up tags
- Fix up missing pm_runtime_put in SM6375 GCC (Johan)
- Clarify the commit message of "Add runtime PM" commits (Johan)
- "GPU_CCC" -> "GPU_CC" (oops)
- Rebase atop next-20231129
- Also fix up camcc-sm8550 & gcc-sm4450
- Unify and clean up the comment style
- Fix missing comments in gcc-sc7180..
- Drop Johan's ack from "clk: qcom: Use qcom_branch_set_clk_en()"
- Improve 6115 dt patch commit message (Bjorn)
- Link to v1: https://lore.kernel.org/r/20230717-topic-branch_aon_cleanup-v1-0-27784d27a4f4@xxxxxxxxxx
---
Konrad Dybcio (12):
clk: qcom: branch: Add a helper for setting the enable bit
clk: qcom: Use qcom_branch_set_clk_en()
clk: qcom: gcc-sm6375: Unregister critical clocks
clk: qcom: gpucc-sm6375: Unregister critical clocks
clk: qcom: gpucc-sm6115: Unregister critical clocks
clk: qcom: gpucc-sm6115: Add runtime PM
clk: qcom: gcc-sm6115: Unregister critical clocks
clk: qcom: gcc-qcm2290: Unregister critical clocks
arm64: dts: qcom: sm6375: Add VDD_CX to GCC
arm64: dts: qcom: qcm2290: Add VDD_CX to GCC
arm64: dts: qcom: sm6115: Add VDD_CX to GCC
arm64: dts: qcom: sm6115: Add VDD_CX to GPU_CC
> arch/arm64/boot/dts/qcom/qcm2290.dtsi | 1 +
arch/arm64/boot/dts/qcom/sm6115.dtsi | 3 +
arch/arm64/boot/dts/qcom/sm6375.dtsi | 1 +
drivers/clk/qcom/camcc-sc8280xp.c | 6 +-
drivers/clk/qcom/camcc-sm8550.c | 10 +--
drivers/clk/qcom/clk-branch.h | 7 ++
drivers/clk/qcom/dispcc-qcm2290.c | 4 +-
drivers/clk/qcom/dispcc-sc7280.c | 7 +-
drivers/clk/qcom/dispcc-sc8280xp.c | 4 +-
drivers/clk/qcom/dispcc-sm6115.c | 4 +-
drivers/clk/qcom/dispcc-sm8250.c | 4 +-
drivers/clk/qcom/dispcc-sm8450.c | 7 +-
drivers/clk/qcom/dispcc-sm8550.c | 7 +-
drivers/clk/qcom/dispcc-sm8650.c | 4 +-
drivers/clk/qcom/gcc-qcm2290.c | 106 +++--------------------------
drivers/clk/qcom/gcc-sa8775p.c | 25 +++----
drivers/clk/qcom/gcc-sc7180.c | 22 +++---
drivers/clk/qcom/gcc-sc7280.c | 20 +++---
drivers/clk/qcom/gcc-sc8180x.c | 28 +++-----
drivers/clk/qcom/gcc-sc8280xp.c | 25 +++----
drivers/clk/qcom/gcc-sdx55.c | 12 ++--
drivers/clk/qcom/gcc-sdx65.c | 13 ++--
drivers/clk/qcom/gcc-sdx75.c | 10 +--
drivers/clk/qcom/gcc-sm4450.c | 28 +++-----
drivers/clk/qcom/gcc-sm6115.c | 124 +++-------------------------------
drivers/clk/qcom/gcc-sm6375.c | 105 +++-------------------------
drivers/clk/qcom/gcc-sm7150.c | 23 +++----
drivers/clk/qcom/gcc-sm8250.c | 19 ++----
drivers/clk/qcom/gcc-sm8350.c | 20 +++---
drivers/clk/qcom/gcc-sm8450.c | 21 +++---
drivers/clk/qcom/gcc-sm8550.c | 21 +++---
drivers/clk/qcom/gcc-sm8650.c | 16 ++---
drivers/clk/qcom/gcc-x1e80100.c | 16 ++---
drivers/clk/qcom/gpucc-sc7280.c | 9 +--
drivers/clk/qcom/gpucc-sc8280xp.c | 9 +--
drivers/clk/qcom/gpucc-sm6115.c | 53 ++++++---------
drivers/clk/qcom/gpucc-sm6375.c | 34 ++--------
drivers/clk/qcom/gpucc-sm8550.c | 10 +--
drivers/clk/qcom/lpasscorecc-sc7180.c | 7 +-
drivers/clk/qcom/videocc-sm8250.c | 6 +-
drivers/clk/qcom/videocc-sm8350.c | 10 +--
drivers/clk/qcom/videocc-sm8450.c | 13 ++--
drivers/clk/qcom/videocc-sm8550.c | 13 ++--
43 files changed, 234 insertions(+), 653 deletions(-)
---
base-commit: 8d04a7e2ee3fd6aabb8096b00c64db0d735bc874
change-id: 20230717-topic-branch_aon_cleanup-6976c13fe71c
Best regards,
--
Thanks & Regards,
Taniya Das.