linux-kernel - Re: [v1] drm/msm/disp/dpu1: icc path needs to be set before dpu runtime resume

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Date:   Mon, 22 Mar 2021 17:44:48 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Kalyan Thota <kalyan_t@...eaurora.org>
Cc:     y@...lcomm.com, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, Kalyan Thota <kalyant@...eaurora.org>,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, mkrishn@...eaurora.org, hywu@...gle.com,
        midean@...gle.com
Subject: Re: [v1] drm/msm/disp/dpu1: icc path needs to be set before dpu
 runtime resume

On Mon, Mar 22, 2021 at 02:17:12AM -0700, Kalyan Thota wrote:
> From: Kalyan Thota <kalyant@...eaurora.org>
> 
> DPU runtime resume will request for a min vote on the AXI bus as
> it is a necessary step before turning ON the AXI clock.
> 
> The change does below
> 1) Move the icc path set before requesting runtime get_sync.
> 2) remove the dependency of hw catalog for min ib vote
> as it is initialized at a later point.
> 
> Signed-off-by: Kalyan Thota <kalyan_t@...eaurora.org>

Confirmed that this fixes a bunch of warnings at boot on SC7180 when
(out-of-tree) camera support is enabled:

  [    1.832228] gcc_disp_hf_axi_clk status stuck at 'off'
  [    2.118292] gcc_disp_hf_axi_clk status stuck at 'off'
  [    2.442383] gcc_disp_hf_axi_clk already disabled
  [    2.750054] gcc_disp_hf_axi_clk already unprepared
  [    3.154835] gcc_disp_hf_axi_clk already disabled
  [    3.421835] gcc_disp_hf_axi_clk already unprepared

Tested-by: Matthias Kaehlcke <mka@...omium.org>