Re: [PATCHv5] drm/amdgpu: vi: disable ASPM on Intel Alder Lake based systems

["Gong, Richard" <richard.gong@xxxxxxx>]

Hi Paul,

On 5/1/2022 2:14 AM, Paul Menzel wrote:
> Dear Richard,
>
>
> Am 29.04.22 um 18:06 schrieb Richard Gong:
> > Active State Power Management (ASPM) feature is enabled since kernel 
> > 5.14.
> > There are some AMD Volcanic Islands (VI) GFX cards, such as the 
> > WX3200 and
> > RX640, that do not work with ASPM-enabled Intel Alder Lake based 
> > systems.
> > Using these GFX cards as video/display output, Intel Alder Lake based
> > systems will freeze after suspend/resume.
>
> As replied in v4 just now, “freeze” is misleading if you can still run 
> `dmesg` after resume.
As my comments in v4, we can't run 'dmesg' when issue occurred. User 
have to recycle power to reset the system.
> Kind regards,
>
> Paul

Regards,

Richard

> > The issue was originally reported on one system (Dell Precision 3660 
> > with
> > BIOS version 0.14.81), but was later confirmed to affect at least 4
> > pre-production Alder Lake based systems.
> >
> > Add an extra check to disable ASPM on Intel Alder Lake based systems 
> > with
> > the problematic AMD Volcanic Islands GFX cards.
> >
> > Fixes: 0064b0ce85bb ("drm/amd/pm: enable ASPM by default")
> > Link: 
> > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Fdrm%2Famd%2F-%2Fissues%2F1885&data=05%7C01%7Crichard.gong%40amd.com%7C78173acb0fe3463fead808da2b423e81%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637869860787352219%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=TK3Ur99Ro4OczgUlCpdod6CrvgGJvNZAyUfpzKEqExw%3D&reserved=0
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > Signed-off-by: Richard Gong <richard.gong@xxxxxxx>
> > ---
> > v5: added vi to commit header and updated commit message
> >      rolled back guard with the preprocessor as did in v2 to correct 
> > build
> >      error on non-x86 systems
> > v4: s/CONFIG_X86_64/CONFIG_X86
> >      enhanced check logic
> > v3: s/intel_core_aspm_chk/aspm_support_quirk_check
> >      correct build error with W=1 option
> > 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..45f0188c4273 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)
> > +#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 aspm_support_quirk_check(void)
> > +{
> > +#if IS_ENABLED(CONFIG_X86)
> > +    struct cpuinfo_x86 *c = &cpu_data(0);
> > +
> > +    return !(c->x86 == 6 && c->x86_model == INTEL_FAM6_ALDERLAKE);
> > +#else
> > +    return true;
> > +#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) || 
> > !aspm_support_quirk_check())
> >           return;
> >         if (adev->flags & AMD_IS_APU ||