input: rockchip_pwm_remotectl: fix IRQ selection and sharing on PWM v1

[sormy]

Follow-up to #503, which is correct on v4 but not on v1.

Wrong IRQ. The code takes platform_get_irq(pdev, 1) and falls back to index 0
on failure. On v4 index 1 is channel 3's dedicated capture IRQ; on v1 it is the
pwrmatch IRQ and capture lives on the group IRQ at index 0. The lookup succeeds on
v1, so the fallback never runs — irq 28: nobody cared. Select by pwm_version;
the driver defines only 1 and 4.

Non-shared request. On v1 the group IRQ is shared with the other channels, and
pwm-rockchip claims it IRQF_NO_SUSPEND | IRQF_SHARED for main_version < 4, so
a non-shared request is refused. Both handlers already read PWM_REG_INTSTS and
return IRQ_NONE, so sharing is safe.

Wake source. Moving capture to index 0 also moves what enable_irq_wake() arms,
but the power key arrives on pwrmatch — remotectl_suspend() masks the capture
channel and leaves PWM_PWR_INT_ENABLE set. pwr_irq is now marked too.

Verified on an RK3528 box:

irq 28  rk_pwm_irq ×4    wakeup=enabled   (group, shared with pwm-rockchip)
irq 57  rk_pwm_pwr_irq   wakeup=enabled   (pwrmatch)

Receiver enumerates as event2, every remote button produces key events, the power
key cold-boots from off, no nobody cared and no flags mismatch. Not covered:
resume from s2idle — deep-suspend wake on this SoC goes through PSCI/PMU. No change
on v4.

[coderabbitai]

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• drivers/input/remotectl/rockchip_pwm_remotectl.c

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Walkthrough

The driver requests the PWR and main PWM IRQs with IRQF_SHARED. During probe, PWM v4 selects capture IRQ index 1. Older PWM versions select index 0. The selected IRQ remains checked for errors.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 30a34

The PR selects the correct PWM v1 group IRQ and enables safe sharing while preserving the separate power-match IRQ; button input and cold-boot behavior work with clean interrupt state, so no actionable merge-blocking risk remains beyond normal checks.

Possibly related PRs

• armbian/linux-rockchip#503: Updates the same PWM IRQ selection and shared IRQ behavior.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely identifies the driver and its two main fixes: IRQ selection and sharing for PWM v1.
Description check	✅ Passed	The description directly explains the IRQ selection, sharing, wake-source changes, verification, and known test limitation.

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Actionable comments posted: 1

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Inline comments:
In `@drivers/input/remotectl/rockchip_pwm_remotectl.c`:
- Around line 945-948: Update the PWM v1 power-key setup so the IRQ stored in
pwr_irq, obtained from platform IRQ index 1, is marked as a wake IRQ with
enable_irq_wake(). Keep the capture IRQ and pwr_irq separate, preserve the
existing PWM version selection, and ensure this applies when pwm_pwrkey_capture
is enabled.

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• drivers/input/remotectl/rockchip_pwm_remotectl.c

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[sormy]

Good finding — confirmed and fixed in 815e609.

You're right that this patch moves what gets armed: enable_irq_wake() is
applied to the selected capture IRQ, so switching v1 from index 1 to index 0
moved wake arming off the line the power key actually uses.
remotectl_suspend() masks the capture channel and leaves PWM_PWR_INT_ENABLE
set, and IRQF_NO_SUSPEND keeps that line delivered without making it a wake
source. pwr_irq is now marked as a wake source, with the return checked.

Two caveats I'd rather state than have you find:

• Not yet exercised across a suspend cycle. On this SoC deep-suspend wake runs
  through PSCI/PMU (remote_support_psci = 1, rockchip-suspend present), which
  is why the board woke regardless; the arming matters for s2idle and for boards
  without that path.
• rk_pwm_remove() is empty, so the pre-existing enable_irq_wake() was already
  unbalanced on unbind. This follows the same pattern rather than reworking the
  driver's wake lifecycle in a fix about IRQ selection.

[sormy]

Closed the loop on this without needing a suspend cycle — /sys/kernel/irq/*/wakeup
exposes the genirq wake state directly (CONFIG_GENERIC_IRQ_SYSFS), so the arming
is readable. Rebuilt and rebooted with the fix:

irq 28  rk_pwm_irq,rk_pwm_irq,rk_pwm_irq,rk_pwm_irq   wakeup=enabled   (hwirq 85, capture)
irq 57  rk_pwm_pwr_irq                                wakeup=enabled   (hwirq 86, pwrmatch)

irq now resolves to index 0, so the only path that arms 57 is the added
enable_irq_wake(pwr_irq); it returns success too, as the new dev_warn never
fires. No nobody cared, no flags mismatch.

Still not covered, and the PR says so: whether a power-key press actually resumes
from s2idle. That is beyond the arming itself — on this SoC deep-suspend wake runs
through PSCI/PMU, not the IRQ wake framework.