[PATCH] drm/amdgpu/pm: update documentation on memory clock

[Alex Deucher]

On Thu, Jul 25, 2024 at 11:11 PM Feng, Kenneth <Kenneth.Feng at amd.com> wrote:
>
> [AMD Official Use Only - AMD Internal Distribution Only]
>
> Hi Alex,
> I know that G6 MCLK = 2*UCLK.
> May I know how did you get the data that effective_memory_clock = memory_controller_clock * 1?

I swear someone on the pplib team told me it was 1 due to changes in
the PHY.  I stand corrected.

Alex


> Thanks.
>
>
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Alex Deucher
> Sent: Friday, July 26, 2024 5:41 AM
> To: Deucher, Alexander <Alexander.Deucher at amd.com>
> Cc: amd-gfx at lists.freedesktop.org
> Subject: Re: [PATCH] drm/amdgpu/pm: update documentation on memory clock
>
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
> Ping?
>
> On Thu, May 2, 2024 at 5:07 PM Alex Deucher <alexander.deucher at amd.com> wrote:
> >
> > Update documentation for RDNA3 dGPUs.
> >
> > Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> > ---
> >  drivers/gpu/drm/amd/pm/amdgpu_pm.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > index ec9058c80647a..9ad114e695e5d 100644
> > --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > @@ -610,12 +610,18 @@ static ssize_t amdgpu_set_pp_table(struct device *dev,
> >   *
> >   * Clock conversion (Mhz):
> >   *
> > + * Pre-RDNA3 GPUs:
> > + *
> >   * HBM: effective_memory_clock = memory_controller_clock * 1
> >   *
> >   * G5: effective_memory_clock = memory_controller_clock * 1
> >   *
> >   * G6: effective_memory_clock = memory_controller_clock * 2
> >   *
> > + * RDNA3 GPUs:
> > + *
> > + * G6: effective_memory_clock = memory_controller_clock * 1
> > + *
> >   * DRAM data rate (MT/s):
> >   *
> >   * HBM: effective_memory_clock * 2 = data_rate
> > --
> > 2.44.0
> >