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drm/amd/display: Init clock value by current vbios CLKs

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[ Upstream commit 7e0b367db85ef7b91399006253759a024eab7653 ]

[Why]
While booting into OS, driver updates DPP/DISP CLKs.
But init clock value is zero which is invalid.

[How]
Get current clocks value to update init clocks.
To avoid underflow.

Signed-off-by: Brandon Syu <Brandon.Syu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Brandon Syu 2020-11-12 15:35:52 +08:00 committed by Greg Kroah-Hartman
parent c137a880ae
commit 12db619c91
1 changed files with 11 additions and 2 deletions
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13
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
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@ -97,8 +97,17 @@ void rn_update_clocks(struct clk_mgr *clk_mgr_base,
new_clocks->dppclk_khz = 100000;
}
if (should_set_clock(safe_to_lower, new_clocks->dppclk_khz, clk_mgr->base.clks.dppclk_khz)) {
if (clk_mgr->base.clks.dppclk_khz > new_clocks->dppclk_khz)
/*
* Temporally ignore thew 0 cases for disp and dpp clks.
* We may have a new feature that requires 0 clks in the future.
*/
if (new_clocks->dppclk_khz == 0 || new_clocks->dispclk_khz == 0) {
new_clocks->dppclk_khz = clk_mgr_base->clks.dppclk_khz;
new_clocks->dispclk_khz = clk_mgr_base->clks.dispclk_khz;
}
if (should_set_clock(safe_to_lower, new_clocks->dppclk_khz, clk_mgr_base->clks.dppclk_khz)) {
if (clk_mgr_base->clks.dppclk_khz > new_clocks->dppclk_khz)
dpp_clock_lowered = true;
clk_mgr_base->clks.dppclk_khz = new_clocks->dppclk_khz;
update_dppclk = true;