RE: [PATCHv2] drm/amdgpu: disable ASPM on Intel AlderLake based systems

["Limonciello, Mario" <Mario.Limonciello@xxxxxxx>]

[Public]



> -----Original Message-----
> From: Alex Deucher <alexdeucher@xxxxxxxxx>
> Sent: Friday, April 8, 2022 14:09
> To: Gong, Richard <Richard.Gong@xxxxxxx>
> Cc: Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Koenig, Christian
> <Christian.Koenig@xxxxxxx>; Pan, Xinhui <Xinhui.Pan@xxxxxxx>; Dave Airlie
> <airlied@xxxxxxxx>; Daniel Vetter <daniel@xxxxxxxx>; Limonciello, Mario
> <Mario.Limonciello@xxxxxxx>; Maling list - DRI developers <dri-
> devel@xxxxxxxxxxxxxxxxxxxxx>; amd-gfx list <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>;
> LKML <linux-kernel@xxxxxxxxxxxxxxx>
> Subject: Re: [PATCHv2] drm/amdgpu: disable ASPM on Intel AlderLake based
> systems
> 
> On Fri, Apr 8, 2022 at 3:05 PM Richard Gong <richard.gong@xxxxxxx> wrote:
> >
> > Active State Power Management (ASPM) feature is enabled since kernel 5.14.
> > There are some AMD GFX cards (such as WX3200 and RX640) that cannot be
> > used with Intel AlderLake based systems to enable ASPM. Using these GFX
> > cards as video/display output, Intel Alder Lake based systems will hang
> > during suspend/resume.
> >
> > Add extra check to disable ASPM on Intel AlderLake based systems.
> >
> > Fixes: 0064b0ce85bb ("drm/amd/pm: enable ASPM by default")
> > Link:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.fr
> eedesktop.org%2Fdrm%2Famd%2F-
> %2Fissues%2F1885&amp;data=04%7C01%7Cmario.limonciello%40amd.com%7
> C440357cd10e74d8c4e1d08da1993344b%7C3dd8961fe4884e608e11a82d994e1
> 83d%7C0%7C0%7C637850417310167943%7CUnknown%7CTWFpbGZsb3d8eyJ
> WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C
> 3000&amp;sdata=WXyESh1FGlxgFLH14P7pYJu3tsyp53uKpUP9NyDV5yE%3D&am
> p;reserved=0
> > Signed-off-by: Richard Gong <richard.gong@xxxxxxx>
> 
> Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>

Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>

> 
> > ---
> > v2: correct commit description
> >     move the check from chip family to problematic platform
> > ---
> >  drivers/gpu/drm/amd/amdgpu/vi.c | 17 ++++++++++++++++-
> >  1 file changed, 16 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c
> b/drivers/gpu/drm/amd/amdgpu/vi.c
> > index 039b90cdc3bc..8b4eaf54b23e 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/vi.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/vi.c
> > @@ -81,6 +81,10 @@
> >  #include "mxgpu_vi.h"
> >  #include "amdgpu_dm.h"
> >
> > +#if IS_ENABLED(CONFIG_X86_64)
> > +#include <asm/intel-family.h>
> > +#endif
> > +
> >  #define ixPCIE_LC_L1_PM_SUBSTATE       0x100100C6
> >  #define
> PCIE_LC_L1_PM_SUBSTATE__LC_L1_SUBSTATES_OVERRIDE_EN_MASK
> 0x00000001L
> >  #define PCIE_LC_L1_PM_SUBSTATE__LC_PCI_PM_L1_2_OVERRIDE_MASK
> 0x00000002L
> > @@ -1134,13 +1138,24 @@ static void vi_enable_aspm(struct
> amdgpu_device *adev)
> >                 WREG32_PCIE(ixPCIE_LC_CNTL, data);
> >  }
> >
> > +static bool intel_core_apsm_chk(void)
> > +{
> > +#if IS_ENABLED(CONFIG_X86_64)
> > +       struct cpuinfo_x86 *c = &cpu_data(0);
> > +
> > +       return (c->x86 == 6 && c->x86_model == INTEL_FAM6_ALDERLAKE);
> > +#else
> > +       return false;
> > +#endif
> > +}
> > +
> >  static void vi_program_aspm(struct amdgpu_device *adev)
> >  {
> >         u32 data, data1, orig;
> >         bool bL1SS = false;
> >         bool bClkReqSupport = true;
> >
> > -       if (!amdgpu_device_should_use_aspm(adev))
> > +       if (!amdgpu_device_should_use_aspm(adev) || intel_core_apsm_chk())
> >                 return;
> >
> >         if (adev->flags & AMD_IS_APU ||
> > --
> > 2.25.1
> >