From e791bc29fea7186e0440301ab481f1b7508decb3 Mon Sep 17 00:00:00 2001 From: Vinod Polimera Date: Tue, 22 Mar 2022 08:57:07 +0530 Subject: [PATCH] drm/msm/disp/dpu1: set mdp clk to the maximum frequency in opp table during probe Set mdp clock to max clock rate during probe/bind sequence from the opp table so that rails are not at undetermined state. Since we do not know what will be the rate set in boot loader, it would be ideal to vote at max frequency. There could be a firmware display programmed in bootloader and we want to transition it to kernel without underflowing. The clock will be scaled down later when framework sends an update. Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support") Signed-off-by: Vinod Polimera Reviewed-by: Dmitry Baryshkov Reviewed-by: Douglas Anderson Tested-by: Douglas Anderson Patchwork: https://patchwork.freedesktop.org/patch/479090/ Link: https://lore.kernel.org/r/1647919631-14447-2-git-send-email-quic_vpolimer@quicinc.com Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c index ecde6fc..143d664 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c @@ -1212,7 +1212,9 @@ static int dpu_kms_init(struct drm_device *ddev) struct platform_device *pdev = to_platform_device(dev); struct dpu_kms *dpu_kms; int irq; + struct dev_pm_opp *opp; int ret = 0; + unsigned long max_freq = ULONG_MAX; dpu_kms = devm_kzalloc(&pdev->dev, sizeof(*dpu_kms), GFP_KERNEL); if (!dpu_kms) @@ -1235,6 +1237,12 @@ static int dpu_kms_init(struct drm_device *ddev) } dpu_kms->num_clocks = ret; + opp = dev_pm_opp_find_freq_floor(dev, &max_freq); + if (!IS_ERR(opp)) + dev_pm_opp_put(opp); + + dev_pm_opp_set_rate(dev, max_freq); + ret = msm_kms_init(&dpu_kms->base, &kms_funcs); if (ret) { DPU_ERROR("failed to init kms, ret=%d\n", ret); -- 2.7.4