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<body><span class="vcard"><a class="email" href="mailto:janpieter.sollie@dommel.be" title="Janpieter Sollie <janpieter.sollie@dommel.be>"> <span class="fn">Janpieter Sollie</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - 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]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107296">bug 107296</a>
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<td style="text-align:right;">Attachment #144689 is obsolete</td>
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<td>1
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - 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]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107296#c21">Comment # 21</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - 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]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107296">bug 107296</a>
from <span class="vcard"><a class="email" href="mailto:janpieter.sollie@dommel.be" title="Janpieter Sollie <janpieter.sollie@dommel.be>"> <span class="fn">Janpieter Sollie</span></a>
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<pre>Created <span class=""><a href="attachment.cgi?id=145764" name="attach_145764" title="dmesg of PPLIB error">attachment 145764</a> <a href="attachment.cgi?id=145764&action=edit" title="dmesg of PPLIB error">[details]</a></span>
dmesg of PPLIB error
still present on linux 5.3, with the following exceptions:
- the values in mV seem to be initialized,
- DRM does not complain about 'Cannot find any crtc or sizes' after GPU adding
- DRM: construct error is gone
So it's going the good way, I guess ...
I investigated the source around dcn_bw_update_from_pplib
And I saw the following code in gpu/drm/amd/display/dc/calcs/dcn_calcs.c
========================================
bool res;
/* 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);
kernel_fpu_begin();
if (res)
res = verify_clock_values(&fclks);
if (res) {
//unimportant, left out
} else
BREAK_TO_DEBUGGER();
=============================================
which probably explains what happens: fclks gets a number of clock values from
dm_pp_get_clock_levels_by_type_with_voltage, setting res to true.
It tries to validate the clock values then, which fails because of the invalid
numbers
After that, it breaks to debugger.
Is it possible the vega11 needs more time to initialize its clock limits?</pre>
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