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Diffstat (limited to 'results/classifier/108/other/1905226')
| -rw-r--r-- | results/classifier/108/other/1905226 | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/results/classifier/108/other/1905226 b/results/classifier/108/other/1905226 new file mode 100644 index 00000000..feda1902 --- /dev/null +++ b/results/classifier/108/other/1905226 @@ -0,0 +1,63 @@ +graphic: 0.878 +device: 0.820 +other: 0.772 +performance: 0.771 +semantic: 0.767 +network: 0.723 +socket: 0.672 +vnc: 0.667 +PID: 0.647 +permissions: 0.633 +files: 0.619 +debug: 0.552 +boot: 0.491 +KVM: 0.432 + +intel-hda: stream reset bits are broken + +From HD audio spec, section 3.3.35: + +"Stream Reset (SRST): Writing a 1 causes the corresponding stream to be reset. [...] After the stream hardware has completed sequencing into the reset state, it will report a 1 in this bit. Software must read a 1 from this bit to verify that the stream is in reset. Writing a 0 causes the corresponding stream to exit reset. When the stream hardware is ready to begin operation, it will report a 0 in this bit. Software must read a 0 from this bit before accessing any of the stream registers." + +So to reset a stream I set the bit, but it never reads back as 1 so the driver either times out or will hang forever waiting for it to become 1. I looked into why this happens and found that as of the latest version (8110fa1), in function intel_hda_set_st_ctl() of the https://github.com/qemu/qemu/blob/master/hw/audio/intel-hda.c, + + if (st->ctl & 0x01) { + /* reset */ + dprint(d, 1, "st #%d: reset\n", reg->stream); + st->ctl = SD_STS_FIFO_READY << 24; + } + +This causes the bit to immediately become set to 0 even if I write a 1, and clearly does not meet the spec. I checked behaviour of real hardware and it works as expected, i.e. I see the bit will become 1 and 0 when I write to it. + +The QEMU project is currently moving its bug tracking to another system. +For this we need to know which bugs are still valid and which could be +closed already. Thus we are setting the bug state to "Incomplete" now. + +If the bug has already been fixed in the latest upstream version of QEMU, +then please close this ticket as "Fix released". + +If it is not fixed yet and you think that this bug report here is still +valid, then you have two options: + +1) If you already have an account on gitlab.com, please open a new ticket +for this problem in our new tracker here: + + https://gitlab.com/qemu-project/qemu/-/issues + +and then close this ticket here on Launchpad (or let it expire auto- +matically after 60 days). Please mention the URL of this bug ticket on +Launchpad in the new ticket on GitLab. + +2) If you don't have an account on gitlab.com and don't intend to get +one, but still would like to keep this ticket opened, then please switch +the state back to "New" or "Confirmed" within the next 60 days (other- +wise it will get closed as "Expired"). We will then eventually migrate +the ticket automatically to the new system (but you won't be the reporter +of the bug in the new system and thus you won't get notified on changes +anymore). + +Thank you and sorry for the inconvenience. + + +[Expired for QEMU because there has been no activity for 60 days.] + |