On Wed, Mar 18, 2015 at 10:37:16AM +0100, Paul Bolle wrote: > Imre Deak schreef op ma 02-03-2015 om 13:04 [+0200]: > > Bjørn reported that his machine hang during hibernation and eventually > > bisected the problem to the following commit: > > > > commit da2bc1b9db3351addd293e5b82757efe1f77ed1d > > Author: Imre Deak <imre.deak@xxxxxxxxx> > > Date: Thu Oct 23 19:23:26 2014 +0300 > > > > drm/i915: add poweroff_late handler > > > > The problem seems to be that after the kernel puts the device into D3 > > the BIOS still tries to access it, or otherwise assumes that it's in D0. > > This is clearly bogus, since ACPI mandates that devices are put into D3 > > by the OSPM if they are not wake-up sources. In the future we want to > > unify more of the driver's runtime and system suspend paths, for example > > by skipping all the system suspend/hibernation hooks if the device is > > runtime suspended already. Accordingly for all other platforms the goal > > is still to properly power down the device during hibernation. > > > > v2: > > - Another GEN4 Lenovo laptop had the same issue, while platforms from > > other vendors (including mobile and desktop, GEN4 and non-GEN4) seem > > to work fine. Based on this apply the workaround on all GEN4 Lenovo > > platforms. > > - add code comment about failing platforms (Ville) > > The outdated ThinkPad X41 that I torture by running rc's showed > identical symptoms, also since v3.19-rc1. It uses a gen3 chipset (it has > a 915GM, I think, but I keep forgetting details like that). > > I did everything wrong to get this fixed (1: hope this gets magically > fixed; 2: bisect it myself, thinking every now and then that I know > better than git bisect which commit to choose; 3: finally grep lkml). So > here I am late to the show. > > > Reference: http://lists.freedesktop.org/archives/intel-gfx/2015-February/060633.html > > Reported-and-bisected-by: Bjørn Mork <bjorn@xxxxxxx> > > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> > > --- > > drivers/gpu/drm/i915/i915_drv.c | 30 +++++++++++++++++++++++++----- > > 1 file changed, 25 insertions(+), 5 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c > > index 4badb23..ff3662f 100644 > > --- a/drivers/gpu/drm/i915/i915_drv.c > > +++ b/drivers/gpu/drm/i915/i915_drv.c > > @@ -637,7 +637,7 @@ static int i915_drm_suspend(struct drm_device *dev) > > return 0; > > } > > > > -static int i915_drm_suspend_late(struct drm_device *drm_dev) > > +static int i915_drm_suspend_late(struct drm_device *drm_dev, bool hibernation) > > { > > struct drm_i915_private *dev_priv = drm_dev->dev_private; > > int ret; > > @@ -651,7 +651,17 @@ static int i915_drm_suspend_late(struct drm_device *drm_dev) > > } > > > > pci_disable_device(drm_dev->pdev); > > - pci_set_power_state(drm_dev->pdev, PCI_D3hot); > > + /* > > + * During hibernation on some GEN4 platforms the BIOS may try to access > > + * the device even though it's already in D3 and hang the machine. So > > + * leave the device in D0 on those platforms and hope the BIOS will > > + * power down the device properly. Platforms where this was seen: > > + * Lenovo Thinkpad X301, X61s > > + */ > > + if (!(hibernation && > > + drm_dev->pdev->subsystem_vendor == PCI_VENDOR_ID_LENOVO && > > + INTEL_INFO(dev_priv)->gen == 4)) > > + pci_set_power_state(drm_dev->pdev, PCI_D3hot); > > > > return 0; > > } > > I'll paste a DRAFT patch that fixes this for that X41 at the end of the > message. The patch is rather ugly. Should we perhaps try a quirk table > or something like that? > > > Paul Bolle > > -------->8-------- > Subject: [PATCH] drm/i915: work around hang during hibernation on gen3 too > > Commit ab3be73fa7b4 ("drm/i915: gen4: work around hang during > hibernation") was targetted at gen4 platforms shipped by Lenovo. The > same problem can also be seen on a Lenovo ThinkPad X41. Expand the test > to catch that system too. > > Sadly, this system still uses IBM's subsystem vendor id. So we end up > with a rather unpleasant test. Use the IS_GEN3() and IS_GEN4() macros to > lessen the pain a bit. We had another bug report which showed similar problems on something as recent as SNB: https://bugzilla.kernel.org/show_bug.cgi?id=94241 So I guess we really want to make the check 'gen < 7'. My IVB X1 Carbon doesn't need this quirk, so hopefully that indicates the Lenovo BIOSen became more sane for gen7+. > > Not-yet-signed-off-by: Paul Bolle <pebolle@xxxxxxxxxx> > --- > drivers/gpu/drm/i915/i915_drv.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c > index cc6ea53d2b81..3a07164f5860 100644 > --- a/drivers/gpu/drm/i915/i915_drv.c > +++ b/drivers/gpu/drm/i915/i915_drv.c > @@ -641,11 +641,12 @@ static int i915_drm_suspend_late(struct drm_device *drm_dev, bool hibernation) > * the device even though it's already in D3 and hang the machine. So > * leave the device in D0 on those platforms and hope the BIOS will > * power down the device properly. Platforms where this was seen: > - * Lenovo Thinkpad X301, X61s > + * Lenovo Thinkpad X301, X61s, X41 > */ > if (!(hibernation && > - drm_dev->pdev->subsystem_vendor == PCI_VENDOR_ID_LENOVO && > - INTEL_INFO(dev_priv)->gen == 4)) > + (drm_dev->pdev->subsystem_vendor == PCI_VENDOR_ID_LENOVO || > + drm_dev->pdev->subsystem_vendor == PCI_SUBVENDOR_ID_IBM) && > + (IS_GEN3(dev_priv) || IS_GEN4(dev_priv)))) > pci_set_power_state(drm_dev->pdev, PCI_D3hot); > > return 0; > -- > 2.1.0 -- Ville Syrjälä Intel OTC _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
