[PATCH] drm/i915: enable BIOS hang workaround for Lenovo T60 too

[Daniel Vetter]

On Fri, Jun 19, 2015 at 08:17:55AM +0200, Mikko Rapeli wrote:
> When trying to hibernate a Lenovo T60 the half moon led keeps blinking and
> devices does not power off since commit da2bc1b9db3.
> 
> T60 chip details:
> 
> 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GM
> L Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
>         Subsystem: Lenovo ThinkPad R60/T60/X60 series
>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Step
> ping- SERR- FastB2B- DisINTx-
>         Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
> <MAbort- >SERR- <PERR- INTx-
>         Latency: 0
>         Interrupt: pin A routed to IRQ 16
>         Region 0: Memory at ee100000 (32-bit, non-prefetchable) [size=512K]
>         Region 1: I/O ports at 1800 [size=8]
>         Region 2: Memory at d0000000 (32-bit, prefetchable) [size=256M]
>         Region 3: Memory at ee200000 (32-bit, non-prefetchable) [size=256K]
>         Expansion ROM at <unassigned> [disabled]
>         Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
>                 Address: 00000000  Data: 0000
>         Capabilities: [d0] Power Management version 2
>                 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
>         Kernel driver in use: i915
> 
> Signed-off-by: Mikko Rapeli <mikko.rapeli at iki.fi>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index ec4d932..36e311e 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, T60
>  	 */
>  	if (!(hibernation &&
>  	      drm_dev->pdev->subsystem_vendor == PCI_VENDOR_ID_LENOVO &&
> -	      INTEL_INFO(dev_priv)->gen == 4))
> +	      ((INTEL_INFO(dev_priv)->gen == 3) ||
> +	       (INTEL_INFO(dev_priv)->gen == 4)))

I wonder whether we shouldn't do this unconditionally for gen4 and earlier
for Lenovo ... Anyway this needs Cc: stable at vger.kernel.org and is for
Jani to pick up.

Thanks for figuring out what's been broken here.
-Daniel

>  		pci_set_power_state(drm_dev->pdev, PCI_D3hot);
>  
>  	return 0;
> -- 
> 2.1.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch