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feat(zaparoo): grant the native CRT scanout lease, and resync stuck axes - #33
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ZAPAROO-SCANOUT-2 now has a NATIVE grant beside PROXY: on native CRT output the frontend may map Menu's video window through the scanout module, with no HDMI proxy. Only the v2 module profile is accepted. With Direct Video on and CRT mode off, the framebuffer mux is held away from the Linux console until the launcher's VT switch, so boot text is not shown before the frontend paints. After a launcher key check, a direction still held from an axis is compared with the kernel's current axis value. A direction the kernel no longer reports is released; one it still reports is logged, which points at the pad or its driver. The log heartbeat only stamps a tick when the log grew since the last one.
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📝 Walkthrough
Merge Risk: 🟡 Moderate · up to With Direct Video on and CRT mode off, a failed or timed-out switch to the launcher's VT can show another VT's console text on screen, and nothing retries the switch. This should be fixed before merge. A smaller issue is that a failed log heartbeat write can leave new output without a timestamp until more output arrives. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
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| Docstring Coverage |  |
Docstring coverage is 22.58% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 31 functions across 10 files. (3 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely identifies the two primary changes: granting the native CRT scanout lease and resynchronizing stuck axes. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 22.58% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 31 functions across 10 files. (3 skipped: 3 unsupported.)
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Actionable comments posted: 2
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Inline comments:
Review comments at @support/zaparoo/alt_launcher.cpp:
- Around line 802-805: Update the Direct Video handoff guarded by s_dv_fb_hold
so it clears the hold and proceeds only after switch_to_vt() succeeds and tty7
is active; when vt_ok is false, defer the handoff and preserve or restore the
retry path instead of clearing s_tty_deadline.
Review comments at @support/zaparoo/main_log.cpp:
- Line 36: Update the heartbeat write flow so `stamped` is updated from `fstat`
only when the preceding `dprintf` succeeds; on a failed write, preserve the
previous `stamped` value so the heartbeat can be retried.
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📒 Files selected for processing (13)
ZAPAROO_FORK.mdinput.cppsupport/zaparoo/SCANOUT.mdsupport/zaparoo/alt_launcher.cppsupport/zaparoo/alt_launcher.hsupport/zaparoo/launcher_axis_resync.incsupport/zaparoo/main_log.cppsupport/zaparoo/scanout.cppsupport/zaparoo/scanout.hsupport/zaparoo/scanout_conflict.hsupport/zaparoo/scanout_profile.cppsupport/zaparoo/tests/scanout_profile_test.cppvideo.cpp
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…failed log stamps Releasing the Direct Video hold after a failed VT switch put another VT's console on the DAC with no retry. Keep the hold and retry the switch, bounded so a VT that never activates cannot leave the output black. A failed heartbeat write no longer records the unstamped size, so the stamp is retried on the next pass.
1 participant
ZAPAROO-SCANOUT-2request is now answered withZAPAROO-SCANOUT-2 NATIVEon native CRT output, beside the existingPROXYgrant for HDMI. With it the frontend maps Menu's video window through the scanout module instead of/dev/mem, and no HDMI proxy is set up.scanout_profile.cppaccepts only the v2 module profile, andscanout_conflict.hreports the native window as a conflicting physical range.alt_launcher_hide_direct_video_fb), so kernel text is not shown before the frontend paints. One-line hook invideo.cpp.support/zaparoo/launcher_axis_resync.inc, two hook lines ininput.cpp. After a launcher key check, a direction still held from an axis is compared with the kernel's current value for that axis. A direction the kernel no longer reports is released. One the kernel still reports is logged asaxis N held at edge E; kernel value V.[zt N]tick is only written when the log grew since the last tick, so an idle log is not filled with ticks.ZAPAROO_FORK.mdandSCANOUT.mdare updated for the new hooks and the grant.Needs ZaparooProject/Menu_MiSTer#9 (module ABI 2) and ZaparooProject/zaparoo-frontend#539.
Checked:
./docker-build.shbuildsMiSTer_Zaparoo;scanout_profile_testpasses. On a DE10-Nano with a PAL CRT the native grant is taken and the frontend runs on it.Not verified:
Summary by CodeRabbit