[Bug 107296] WARNING: CPU: 0 PID: 370 at drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c:1355 dcn_bw_update_from_pplib+0x16b/0x280 [amdgpu]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107296

--- Comment #1 from Paul Menzel <pmenzel+bugs.freedesktop at molgen.mpg.de> ---
In today’s 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 `#define
BREAK_TO_DEBUGGER() ASSERT(0)`.

```
        /* TODO: This is not the proper way to obtain
fabric_and_dram_bandwidth, should be min(fclk, memclk) */
        res = dm_pp_get_clock_levels_by_type_with_voltage(
                        ctx, DM_PP_CLOCK_TYPE_FCLK, &fclks);

        if (res)
                res = verify_clock_values(&fclks);

        if (res) {
                ASSERT(fclks.num_levels >= 3);
                dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 = 32 *
(fclks.data[0].clocks_in_khz / 1000.0) / 1000.0;
                dc->dcn_soc->fabric_and_dram_bandwidth_vmid0p72 =
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 =
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 =
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

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