> Bob, I think we should incorporate this into ACPICA, shouldn't we? > > Rafael
We are looking at it. Probably one of the Linux/ACPICA divergences that end up causing us grief. > -----Original Message----- > From: linux-acpi-ow...@vger.kernel.org [mailto:linux-acpi- > ow...@vger.kernel.org] On Behalf Of Rafael J. Wysocki > Sent: Sunday, July 08, 2012 1:08 PM > To: Jonathan Nieder; Moore, Robert > Cc: Octavio Alvarez; Adrian Knoth; Shaohua Li; Brown, Len; linux- > a...@vger.kernel.org; linux-kernel@vger.kernel.org > Subject: Re: [PATCH v2] ACPI: Leave Bus Master Arbitration enabled for > suspend/resume > > On Sunday, July 08, 2012, Jonathan Nieder wrote: > > This is an old suspend/resume lockup fix: > > > > commit 2780cc4660e1 > > Author: Len Brown <len.br...@intel.com> > > Date: Thu Dec 23 13:43:30 2004 -0500 > > > > [ACPI] Fix suspend/resume lockup issue > > by leaving Bus Master Arbitration enabled. > > The ACPI spec mandates it be disabled only for C3. > > > > http://bugzilla.kernel.org/show_bug.cgi?id=3599 > > > > Signed-off-by: David Shaohua Li <shaohua...@intel.com> > > Signed-off-by: Len Brown <len.br...@intel.com> > > > > The bug snuck back in in commit 2feec47d4c5f (ACPICA: ACPI 5: Support > > for new FADT SleepStatus, SleepControl registers, 2012-02-14), > > presumably by copy/pasting a copy of the code without that fix for > the > > legacy case. > > > > On affected machines, after that commit, the machine locks up hard on > > resume from suspend. The same fix as seven years ago still works. > > > > Addresses <https://bugzilla.kernel.org/show_bug.cgi?id=43641>. > > > > Reported-bisected-and-tested-by: Octavio Alvarez > > <alvar...@alvarezp.com> > > Reported-by: Adrian Knoth <a...@drcomp.erfurt.thur.de> > > Signed-off-by: Jonathan Nieder <jrnie...@gmail.com> > > Cc: <sta...@vger.kernel.org> # 3.4 > > --- > > Rafael J. Wysocki wrote: > > > > > Can you please repost it with _both_ the changelog and the patch? > > > > Here you go. Sorry about that. > > Thanks! > > Applied to the linux-next branch of the linux-pm.git tree. > > I think I'll push it for v3.6, since the bug is serious and is a > regression. > > Bob, I think we should incorporate this into ACPICA, shouldn't we? > > Rafael > > > > drivers/acpi/acpica/hwsleep.c | 22 ---------------------- > > 1 file changed, 22 deletions(-) > > > > diff --git a/drivers/acpi/acpica/hwsleep.c > > b/drivers/acpi/acpica/hwsleep.c index 0ed85cac3231..615996a36bed > > 100644 > > --- a/drivers/acpi/acpica/hwsleep.c > > +++ b/drivers/acpi/acpica/hwsleep.c > > @@ -95,18 +95,6 @@ acpi_status acpi_hw_legacy_sleep(u8 sleep_state, > u8 flags) > > return_ACPI_STATUS(status); > > } > > > > - if (sleep_state != ACPI_STATE_S5) { > > - /* > > - * Disable BM arbitration. This feature is contained within > an > > - * optional register (PM2 Control), so ignore a BAD_ADDRESS > > - * exception. > > - */ > > - status = acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, > 1); > > - if (ACPI_FAILURE(status) && (status != AE_BAD_ADDRESS)) { > > - return_ACPI_STATUS(status); > > - } > > - } > > - > > /* > > * 1) Disable/Clear all GPEs > > * 2) Enable all wakeup GPEs > > @@ -364,16 +352,6 @@ acpi_status acpi_hw_legacy_wake(u8 sleep_state, > u8 flags) > > [ACPI_EVENT_POWER_BUTTON]. > > status_register_id, ACPI_CLEAR_STATUS); > > > > - /* > > - * Enable BM arbitration. This feature is contained within an > > - * optional register (PM2 Control), so ignore a BAD_ADDRESS > > - * exception. > > - */ > > - status = acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); > > - if (ACPI_FAILURE(status) && (status != AE_BAD_ADDRESS)) { > > - return_ACPI_STATUS(status); > > - } > > - > > acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, > ACPI_SST_WORKING); > > return_ACPI_STATUS(status); > > } > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" > in the body of a message to majord...@vger.kernel.org More majordomo > info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
