media: rockchip: hdmirx: quiet signal-not-lock polling spam

[SuperKali]

When the HDMI-RX detect reports a source but the receiver never gets a lockable signal, hdmirx_wait_lock_and_get_timing logged two v4l2_err lines on every poll, flooding the log every few seconds.

On the YY3588 the detect reads "present" even with nothing attached, so the poll runs continuously and the log fills with:

rk_hdmirx ...: signal not lock, tmds_clk_ratio:0
rk_hdmirx ...: mu_st:0x0, scdc_st:0x0, dma_st10:0x14

Demote both to v4l2_dbg, matching the pull-out path right above. Verified on a YY3588: with a source the receiver still locks and captures 1080p60, with none the log stays clean.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 08a88526-244a-45f9-b1e5-83929e69aa3b

📥 Commits

Reviewing files that changed from the base of the PR and between bb8f02b and 437126a.

📒 Files selected for processing (1)

• drivers/media/platform/rockchip/hdmirx/rk_hdmirx.c

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Walkthrough

This change modifies the logging behavior in the HDMI RX driver's signal lock timeout handling. Previously, when the signal failed to lock within the timeout period, two error-level log messages (reporting tmds_clk_ratio and a register dump of mu_st/scdc_st/dma_st10) were emitted unconditionally via v4l2_err. These are now emitted as debug-level messages via v4l2_dbg, gated by the debug flag.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: reducing HDMI-RX signal-not-lock log spam.
Description check	✅ Passed	The description matches the change and explains the log-spam fix and verification details.
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.

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• Create PR with unit tests

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