[PATCH] drm/amd/display: Don't fill up the logs

[Li, Roman]

[AMD Official Use Only]

Definitely overflowed log makes no sense.
"ONCE" is better than nothing for debugging.
With that said:

Reviewed-by: Roman Li <Roman.Li at amd.com>

> -----Original Message-----
> From: Tuikov, Luben <Luben.Tuikov at amd.com>
> Sent: Thursday, February 24, 2022 5:50 PM
> To: Alex Deucher <alexdeucher at gmail.com>
> Cc: amd-gfx list <amd-gfx at lists.freedesktop.org>; Kuehling, Felix
> <Felix.Kuehling at amd.com>; Li, Roman <Roman.Li at amd.com>; Wu, Hersen
> <hersenxs.wu at amd.com>; Wheeler, Daniel <Daniel.Wheeler at amd.com>;
> Deucher, Alexander <Alexander.Deucher at amd.com>
> Subject: Re: [PATCH] drm/amd/display: Don't fill up the logs
>
> I could, but if they enable KMS debug, this prints 100s of times a second.
> It literally overflows the log. It needs to be printed "ONCE" in whichever mode.
> Either that, or not print it at all--it is "DEBUG" after all.
>
> Regards,
> Luben
>
> On 2022-02-24 17:21, Alex Deucher wrote:
> > On Thu, Feb 24, 2022 at 4:46 PM Luben Tuikov <luben.tuikov at amd.com>
> wrote:
> >>
> >> Don't fill up the logs with:
> >>
> >> [253557.859575] [drm:amdgpu_dm_atomic_check [amdgpu]] DSC
> precompute is not needed.
> >> [253557.892966] [drm:amdgpu_dm_atomic_check [amdgpu]] DSC
> precompute is not needed.
> >> [253557.926070] [drm:amdgpu_dm_atomic_check [amdgpu]] DSC
> precompute is not needed.
> >> [253557.959344] [drm:amdgpu_dm_atomic_check [amdgpu]] DSC
> precompute is not needed.
> >>
> >> which prints many times a second, when the kernel is run with
> >> drm.debug=2.
> >>
> >> Instead of DRM_DEBUG_DRIVER(), make it DRM_INFO_ONCE().
> >
> > Maybe convert to DRM_DEBUG_KMS() for consistency with the rest of the
> > display code?
> >
> > Alex
> >
> >>
> >> Cc: Alex Deucher <Alexander.Deucher at amd.com>
> >> Cc: Roman Li <Roman.Li at amd.com>
> >> Cc: Felix Kuehling <felix.kuehling at amd.com>
> >> Cc: Hersen Wu <hersenwu at amd.com>
> >> Cc: Daniel Wheeler <daniel.wheeler at amd.com>
> >> Fixes: 5898243ba7acdb ("drm/amd/display: Add dsc pre-validation in
> >> atomic check")
> >> Signed-off-by: Luben Tuikov <luben.tuikov at amd.com>
> >> ---
> >>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c   | 8 ++++-
> ---
> >>  1 file changed, 4 insertions(+), 4 deletions(-)
> >>
> >> diff --git
> >> a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> >> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> >> index 05573f073b21f7..0542034530b1b0 100644
> >> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> >> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> >> @@ -1198,11 +1198,11 @@ void pre_validate_dsc(struct drm_atomic_state
> *state,
> >>         struct dc_state *local_dc_state = NULL;
> >>
> >>         if (!is_dsc_precompute_needed(state)) {
> >> -               DRM_DEBUG_DRIVER("DSC precompute is not needed.\n");
> >> +               DRM_INFO_ONCE("DSC precompute is not needed.\n");
> >>                 return;
> >>         }
> >>         if (dm_atomic_get_state(state, dm_state_ptr)) {
> >> -               DRM_DEBUG_DRIVER("dm_atomic_get_state() failed\n");
> >> +               DRM_INFO_ONCE("dm_atomic_get_state() failed\n");
> >>                 return;
> >>         }
> >>         dm_state = *dm_state_ptr;
> >> @@ -1245,7 +1245,7 @@ void pre_validate_dsc(struct drm_atomic_state
> *state,
> >>         }
> >>
> >>         if (!pre_compute_mst_dsc_configs_for_state(state, local_dc_state,
> vars)) {
> >> -
> DRM_DEBUG_DRIVER("pre_compute_mst_dsc_configs_for_state() failed\n");
> >> +
> >> + DRM_INFO_ONCE("pre_compute_mst_dsc_configs_for_state() failed\n");
> >>                 goto clean_exit;
> >>         }
> >>
> >> @@ -1258,7 +1258,7 @@ void pre_validate_dsc(struct drm_atomic_state
> >> *state,
> >>
> >>                 if (local_dc_state->streams[i] &&
> >>                     is_timing_changed(stream, local_dc_state->streams[i])) {
> >> -                       DRM_DEBUG_DRIVER("crtc[%d] needs mode_changed\n", i);
> >> +                       DRM_INFO_ONCE("crtc[%d] needs
> >> + mode_changed\n", i);
> >>                 } else {
> >>                         int ind =
> >> find_crtc_index_in_state_by_stream(state, stream);
> >>
> >>
> >> base-commit: bff980c7632ef3b0099ba230cf7d5c864db3e1a3
> >> --
> >> 2.35.1.129.gb80121027d
> >>
>
> Regards,
> --
> Luben