[PATCH V2 1/1] drm/amdgpu: Disable PCIE_DPM on Intel RKL Platform

[Koba Ko]

On Thu, Aug 26, 2021 at 5:07 PM Lazar, Lijo <lijo.lazar at amd.com> wrote:
>
>
>
> On 8/26/2021 7:05 AM, Koba Ko wrote:
> > AMD polaris GPUs have an issue about audio noise on RKL platform,
> > they provide a commit to fix but for SMU7-based GPU still
> > need another module parameter,
> >
> > modprobe amdgpu ppfeaturemask=0xfff7bffb
> >
> > to avoid the module parameter, switch PCI_DPM by determining
> > intel platform in amd drm driver is a better way.
> >
> > Fixes: 1a31474cdb48 ("drm/amd/pm: workaround for audio noise issue")
> > Ref: https://lists.freedesktop.org/archives/amd-gfx/2021-August/067413.html
> > Signed-off-by: Koba Ko <koba.ko at canonical.com>
> > ---
> >   .../gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c   | 15 ++++++++++++++-
> >   1 file changed, 14 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
> > index 0541bfc81c1b..6ce2a2046457 100644
> > --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
> > +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
> > @@ -27,6 +27,7 @@
> >   #include <linux/pci.h>
> >   #include <linux/slab.h>
> >   #include <asm/div64.h> > +#include <asm/intel-family.h>
>
> Maybe, include conditionally for X86_64.
>
> >   #include <drm/amdgpu_drm.h>
> >   #include "ppatomctrl.h"
> >   #include "atombios.h"
> > @@ -1733,6 +1734,17 @@ static int smu7_disable_dpm_tasks(struct pp_hwmgr *hwmgr)
> >       return result;
> >   }
> >
> > +static bool intel_core_rkl_chk(void)
> > +{
> > +#ifdef CONFIG_X86_64
>
> Better to use IS_ENABLED() here.
>
> Apart from that, looks fine to me.
>
> Reviewed-by: Lijo Lazar <lijo.lazar at amd.com>

Thanks for the comments.
I will send v3.

>
> Thanks,
> Lijo
>
> > +     struct cpuinfo_x86 *c = &cpu_data(0);
> > +
> > +     return (c->x86 == 6 && c->x86_model == INTEL_FAM6_ROCKETLAKE);
> > +#else
> > +     return false;
> > +#endif
> > +}
> > +
> >   static void smu7_init_dpm_defaults(struct pp_hwmgr *hwmgr)
> >   {
> >       struct smu7_hwmgr *data = (struct smu7_hwmgr *)(hwmgr->backend);
> > @@ -1758,7 +1770,8 @@ static void smu7_init_dpm_defaults(struct pp_hwmgr *hwmgr)
> >
> >       data->mclk_dpm_key_disabled = hwmgr->feature_mask & PP_MCLK_DPM_MASK ? false : true;
> >       data->sclk_dpm_key_disabled = hwmgr->feature_mask & PP_SCLK_DPM_MASK ? false : true;
> > -     data->pcie_dpm_key_disabled = hwmgr->feature_mask & PP_PCIE_DPM_MASK ? false : true;
> > +     data->pcie_dpm_key_disabled =
> > +             intel_core_rkl_chk() || !(hwmgr->feature_mask & PP_PCIE_DPM_MASK);
> >       /* need to set voltage control types before EVV patching */
> >       data->voltage_control = SMU7_VOLTAGE_CONTROL_NONE;
> >       data->vddci_control = SMU7_VOLTAGE_CONTROL_NONE;
> >