Commen=
t # 1
on bug 10729=
6
from Paul Menzel
In today=E2=80=99s drm-tip this is:
[ 20.149515] WARNING: CPU: 0 PID: 347 at
drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c:1372
dcn_bw_update_from_pplib+0x16b/0x280 [amdgpu]
It looks like this is `BREAK_TO_DEBUGGER()` [1], which is defined as `#defi=
ne
BREAK_TO_DEBUGGER() ASSERT(0)`.
```
/* TODO: This is not the proper way to obtain
fabric_and_dram_bandwidth, should be min(fclk, memclk) */
res =3D dm_pp_get_clock_levels_by_type_with_voltage(
ctx, DM_PP_CLOCK_TYPE_FCLK, &fclks);
if (res)
res =3D verify_clock_values(&fclks);
if (res) {
ASSERT(fclks.num_levels >=3D 3);
dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 =3D 3=
2 *
(fclks.data[0].clocks_in_khz / 1000.0) / 1000.0;
dc->dcn_soc->fabric_and_dram_bandwidth_vmid0p72 =3D
dc->dcn_soc->number_of_channels *
(fclks.data[fclks.num_levels -
(fclks.num_levels > 2 ? 3 : 2)].clocks_in_khz / 1000.0)
* ddr4_dram_factor_single_Channel / 1000.0;
dc->dcn_soc->fabric_and_dram_bandwidth_vnom0p8 =3D
dc->dcn_soc->number_of_channels *
(fclks.data[fclks.num_levels - 2].clocks_in=
_khz
/ 1000.0)
* ddr4_dram_factor_single_Channel / 1000.0;
dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 =3D
dc->dcn_soc->number_of_channels *
(fclks.data[fclks.num_levels - 1].clocks_in=
_khz
/ 1000.0)
* ddr4_dram_factor_single_Channel / 1000.0;
} else
BREAK_TO_DEBUGGER();
```
So, either `dm_pp_get_clock_levels_by_type_with_voltage()` or
`verify_clock_values(&fclks)` returns 0.
[1]:
https://cgit.freedesktop.org/drm-tip/tree=
/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c#n1372