From: Mika Westerberg <mika.westerberg@intel.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Karol Herbst <kherbst@redhat.com>,
Bjorn Helgaas <helgaas@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Lyude Paul <lyude@redhat.com>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
Linux PCI <linux-pci@vger.kernel.org>,
Linux PM <linux-pm@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
nouveau <nouveau@lists.freedesktop.org>,
Dave Airlie <airlied@gmail.com>,
Mario Limonciello <Mario.Limonciello@dell.com>
Subject: Re: [PATCH v4] pci: prevent putting nvidia GPUs into lower device states on certain intel bridges
Date: Wed, 20 Nov 2019 13:51:27 +0200 [thread overview]
Message-ID: <20191120115127.GD11621@lahna.fi.intel.com> (raw)
In-Reply-To: <20191120112212.GA11621@lahna.fi.intel.com>
On Wed, Nov 20, 2019 at 01:22:16PM +0200, Mika Westerberg wrote:
> If (((OSYS <= 0x07D9) || ((OSYS == 0x07DF) && (_REV ==
> 0x05))))
> {
The OSYS comes from this (in DSDT):
If (_OSI ("Windows 2009"))
{
OSYS = 0x07D9
}
If (_OSI ("Windows 2012"))
{
OSYS = 0x07DC
}
If (_OSI ("Windows 2013"))
{
OSYS = 0x07DD
}
If (_OSI ("Windows 2015"))
{
OSYS = 0x07DF
}
So I guess this particular check tries to identify Windows 7 and older,
and Linux.
> If ((PIOF == Zero))
> {
> P0LD = One
> TCNT = Zero
> While ((TCNT < LDLY))
> {
> If ((P0LT == 0x08))
> {
> Break
> }
>
> Sleep (0x10)
> TCNT += 0x10
> }
>
> P0RM = One
> P0AP = 0x03
> }
> ElseIf ((PIOF == One))
> {
> P1LD = One
> TCNT = Zero
> While ((TCNT < LDLY))
> {
> If ((P1LT == 0x08))
> {
> Break
> }
>
> Sleep (0x10)
> TCNT += 0x10
> }
>
> P1RM = One
> P1AP = 0x03
> }
> ElseIf ((PIOF == 0x02))
> {
> P2LD = One
> TCNT = Zero
> While ((TCNT < LDLY))
> {
> If ((P2LT == 0x08))
> {
> Break
> }
>
> Sleep (0x10)
> TCNT += 0x10
> }
>
> P2RM = One
> P2AP = 0x03
> }
>
> If ((PBGE != Zero))
> {
> If (SBDL (PIOF))
> {
> MBDL = GMXB (PIOF)
> PDUB (PIOF, MBDL)
> }
> }
> }
> Else
> {
> LKDS (PIOF)
> }
>
> If ((DerefOf (SCLK [Zero]) != Zero))
> {
> PCRO (0xDC, 0x100C, DerefOf (SCLK [One]))
> Sleep (0x10)
> }
>
> GPPR (PIOF, Zero)
> If ((OSYS != 0x07D9))
> {
> DIWK (PIOF)
> }
>
> \_SB.SGOV (0x01010004, Zero)
> Sleep (0x14)
> Return (Zero)
> }
next prev parent reply other threads:[~2019-11-20 11:51 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-17 12:19 [PATCH v4] pci: prevent putting nvidia GPUs into lower device states on certain intel bridges Karol Herbst
2019-11-14 19:17 ` Karol Herbst
2019-11-19 20:06 ` Dave Airlie
2019-11-19 21:49 ` Bjorn Helgaas
2019-11-19 22:26 ` Karol Herbst
2019-11-19 22:57 ` Bjorn Helgaas
2019-11-20 10:18 ` Mika Westerberg
2019-11-20 10:52 ` Rafael J. Wysocki
2019-11-20 11:22 ` Mika Westerberg
2019-11-20 11:48 ` Rafael J. Wysocki
2019-11-20 11:51 ` Karol Herbst
2019-11-20 12:06 ` Rafael J. Wysocki
2019-11-20 12:09 ` Karol Herbst
2019-11-20 12:14 ` Rafael J. Wysocki
2019-11-20 12:19 ` Karol Herbst
2019-11-20 12:11 ` Rafael J. Wysocki
2019-11-20 11:51 ` Mika Westerberg [this message]
2019-11-20 11:54 ` Karol Herbst
2019-11-20 11:58 ` Karol Herbst
2019-11-20 12:09 ` Mika Westerberg
2019-11-20 12:11 ` Karol Herbst
2019-11-20 15:15 ` Mika Westerberg
2019-11-20 15:37 ` Karol Herbst
2019-11-20 15:53 ` Mika Westerberg
2019-11-20 16:23 ` Mika Westerberg
2019-11-20 21:36 ` Karol Herbst
2019-11-21 10:14 ` Mika Westerberg
2019-11-21 11:03 ` Rafael J. Wysocki
2019-11-21 11:08 ` Rafael J. Wysocki
2019-11-21 11:15 ` Rafael J. Wysocki
2019-11-21 11:17 ` Mika Westerberg
2019-11-21 11:31 ` Rafael J. Wysocki
2019-11-20 21:37 ` Rafael J. Wysocki
2019-11-20 21:40 ` Karol Herbst
2019-11-20 22:29 ` Rafael J. Wysocki
2019-11-21 11:28 ` Mika Westerberg
2019-11-21 11:34 ` Rafael J. Wysocki
2019-11-21 11:46 ` Mika Westerberg
2019-11-21 12:52 ` Mika Westerberg
2019-11-21 12:56 ` Karol Herbst
2019-11-21 15:43 ` Rafael J. Wysocki
2019-11-21 19:49 ` Mika Westerberg
2019-11-21 22:39 ` Rafael J. Wysocki
2019-11-21 22:50 ` Karol Herbst
2019-11-22 0:13 ` Karol Herbst
2019-11-22 9:07 ` Rafael J. Wysocki
2019-11-22 11:30 ` Karol Herbst
2019-11-22 10:36 ` Mika Westerberg
2019-11-22 11:30 ` Rafael J. Wysocki
2019-11-22 11:34 ` Karol Herbst
2019-11-22 11:54 ` Rafael J. Wysocki
2019-11-22 11:52 ` Mika Westerberg
2019-11-22 12:15 ` Rafael J. Wysocki
2019-11-21 12:52 ` Karol Herbst
2019-11-21 15:47 ` Rafael J. Wysocki
2019-11-21 16:06 ` Karol Herbst
2019-11-21 16:39 ` Rafael J. Wysocki
2019-11-26 23:10 ` Lyude Paul
2019-11-27 11:48 ` Mika Westerberg
2019-11-27 11:51 ` Karol Herbst
2019-11-27 19:51 ` Lyude Paul
2019-12-09 11:17 ` Karol Herbst
2019-12-09 11:38 ` Rafael J. Wysocki
2019-12-09 12:24 ` Karol Herbst
2019-12-10 19:58 ` Dave Airlie
2019-12-10 20:49 ` Karol Herbst
2020-01-13 15:31 ` Karol Herbst
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