drm/amd/display: Init clock value by current vbios CLKs
[ Upstream commit 7e0b367db8
]
[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>
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@ -97,8 +97,17 @@ void rn_update_clocks(struct clk_mgr *clk_mgr_base,
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new_clocks->dppclk_khz = 100000;
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}
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if (should_set_clock(safe_to_lower, new_clocks->dppclk_khz, clk_mgr->base.clks.dppclk_khz)) {
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if (clk_mgr->base.clks.dppclk_khz > new_clocks->dppclk_khz)
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/*
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* Temporally ignore thew 0 cases for disp and dpp clks.
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* We may have a new feature that requires 0 clks in the future.
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*/
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if (new_clocks->dppclk_khz == 0 || new_clocks->dispclk_khz == 0) {
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new_clocks->dppclk_khz = clk_mgr_base->clks.dppclk_khz;
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new_clocks->dispclk_khz = clk_mgr_base->clks.dispclk_khz;
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}
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if (should_set_clock(safe_to_lower, new_clocks->dppclk_khz, clk_mgr_base->clks.dppclk_khz)) {
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if (clk_mgr_base->clks.dppclk_khz > new_clocks->dppclk_khz)
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dpp_clock_lowered = true;
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clk_mgr_base->clks.dppclk_khz = new_clocks->dppclk_khz;
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update_dppclk = true;
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