From e791bc29fea7186e0440301ab481f1b7508decb3 Mon Sep 17 00:00:00 2001
From: Vinod Polimera <quic_vpolimer@quicinc.com>
Date: Tue, 22 Mar 2022 08:57:07 +0530
Subject: drm/msm/disp/dpu1: set mdp clk to the maximum frequency in opp table
during probe
Git-commit: e791bc29fea7186e0440301ab481f1b7508decb3
Patch-mainline: v5.19-rc1
References: bsc#1190768
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 <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
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 <dmitry.baryshkov@linaro.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1136,6 +1136,8 @@ static int dpu_bind(struct device *dev,
struct msm_drm_private *priv = ddev->dev_private;
struct dpu_kms *dpu_kms;
struct dss_module_power *mp;
+ struct dev_pm_opp *opp;
+ unsigned long max_freq = ULONG_MAX;
int ret = 0;
dpu_kms = devm_kzalloc(&pdev->dev, sizeof(*dpu_kms), GFP_KERNEL);
@@ -1161,6 +1163,12 @@ static int dpu_bind(struct device *dev,
platform_set_drvdata(pdev, dpu_kms);
+ 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);