| Summary: | [ILK Bisected]igt/kms_flip subcases causes "[drm:ilk_display_irq_handler] *ERROR* Pipe A FIFO underrun " | ||
|---|---|---|---|
| Product: | DRI | Reporter: | Guo Jinxian <jinxianx.guo> |
| Component: | DRM/Intel | Assignee: | Intel GFX Bugs mailing list <intel-gfx-bugs> |
| Status: | CLOSED FIXED | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> |
| Severity: | normal | ||
| Priority: | high | CC: | intel-gfx-bugs, shuang.he |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
Could you please attach a full dmesg on this one? Mario and Daniel do not regard the bisect result as valid: http://mid.gmane.org/20140923135127.GF15734@phenom.ffwll.local http://mid.gmane.org/5421806A.4050604@gmail.com The failure unable to reproduce on latest -nightly(7101d84020f63f1da7e0c5d021cdd6be4d515de5) [root@x-pk5 tests]# ./kms_flip --run-subtest 2x-flip-vs-expired-vblank IGT-Version: 1.8-g32a0308 (x86_64) (Linux: 3.17.0-rc6_drm-intel-nightly_7101d8_20140929+ x86_64) Using monotonic timestamps Test requirement not met in function run_pair, file kms_flip.c:1461: Test requirement: modes Subtest 2x-flip-vs-expired-vblank: SKIP (0.085s) [root@x-pk5 tests]# dmesg -r|egrep "<[1-4]>"|grep drm [root@x-pk5 tests]# Closing old verified. |
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==System Environment== -------------------------- Regression: Yes. Non-working platforms: ILK ==kernel== -------------------------- origin/drm-intel-nightly:c5660b4ad395f1e34eacc22cf81c687edfc9c83c(fails) drm-intel-nightly: 2014y-09m-19d-18h-12m-22s UTC integration manifest ==Bug detailed description== ----------------------------- igt/kms_flip subcases causes "[drm:ilk_display_irq_handler] *ERROR* Pipe A FIFO underrun " Case list: igt/kms_flip/2x-flip-vs-expired-vblank igt/kms_flip/2x-flip-vs-expired-vblank-interruptible ==Reproduce steps== ---------------------------- 1. ./kms_flip --run-subtest 2x-flip-vs-expired-vblank ==Bisect results form [PRTS][auto-bisect]== ---------------------------- commit cf1a5cccaae1ac843b6042178662820f1fb58dea Author: Mario Kleiner <mario.kleiner.de@gmail.com> AuthorDate: Sat Sep 13 18:25:54 2014 +0200 Commit: Daniel Vetter <daniel.vetter@ffwll.ch> CommitDate: Mon Sep 15 15:47:19 2014 +0200 drm: Don't update vblank timestamp when the counter didn't change If we already have a timestamp for the current vblank counter, don't update it with a new timestmap. Small errors can creep in between two timestamp queries for the same vblank count, which could be confusing to userspace when it queries the timestamp for the same vblank sequence number twice. This problem gets exposed when the vblank disable timer is not used (or is set to expire quickly) and thus we can get multiple vblank disable<->enable transition during the same frame which would all attempt to update the timestamp with the latest estimate. Testcase: igt/kms_flip/flip-vs-expired-vblank Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com> v2:Mario: Trivial rebase on top of current drm-next (13-Sep-2014) Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>