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drm/amd/display: always program DPPDTO unless not safe to lower

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[Why]
We defer clock updates to after pipes have been programmed. In
some instances we use DPPCLK that have been previously set to be
"unused". This results in a brief window of time where underflow
could occur.

[How]
During prepare bandwidth allow rn_update_clocks_update_dpp_dto
to check each instance and compare previous clock to new clock.
If new clock is higher than previous clock, program DPPDTO.

Signed-off-by: Jake Wang <haonan.wang2@amd.com>
Acked-by: Bindu Ramamurthy <bindu.r@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jake Wang 2020-12-11 16:53:57 -05:00 committed by Alex Deucher
parent c277925cca
commit 4aa9d658d2
1 changed files with 5 additions and 6 deletions
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11
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
View file

@ -227,12 +227,11 @@ void rn_update_clocks(struct clk_mgr *clk_mgr_base,
rn_vbios_smu_set_dppclk(clk_mgr, clk_mgr_base->clks.dppclk_khz);
// always update dtos unless clock is lowered and not safe to lower
if (new_clocks->dppclk_khz >= dc->current_state->bw_ctx.bw.dcn.clk.dppclk_khz)
rn_update_clocks_update_dpp_dto(
clk_mgr,
context,
clk_mgr_base->clks.actual_dppclk_khz,
safe_to_lower);
rn_update_clocks_update_dpp_dto(
clk_mgr,
context,
clk_mgr_base->clks.actual_dppclk_khz,
safe_to_lower);
}
if (update_dispclk &&