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drm/msm/dpu: Drop sneaky dev_pm_opp_set_rate(0)

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dev_pm_opp_set_rate(0) removes the vote specified in required-opps but
does not actually park the clock, making it run without the necessary
power backing. Prevent that from happening when
_dpu_core_perf_get_core_clk_rate() returns 0.

Fixes: 25fdd5933e ("drm/msm: Add SDM845 DPU support")
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/742779/
Link: https://lore.kernel.org/r/20260728-topic-dpu_power-v1-1-e7783b859a70@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Konrad Dybcio 2026-07-28 15:20:45 +02:00 committed by Dmitry Baryshkov
parent c16ba6ba3d
commit 811c38907e
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
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@ -394,6 +394,10 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
trace_dpu_core_perf_update_clk(kms->dev, !crtc->enabled, clk_rate);
/* If we're going offline, PM callbacks will disable the clocks instead */
if (!clk_rate)
return 0;
clk_rate = min(clk_rate, kms->perf.max_core_clk_rate);
ret = dev_pm_opp_set_rate(&kms->pdev->dev, clk_rate);
if (ret) {