Re: [PATCH] clk: qcom: dispcc-sc8280xp: Don't park mdp_clk_src at registration time

[Pengyu Luo]

On Wed, Mar 4, 2026 at 7:20 PM Konrad Dybcio
<konrad.dybcio@xxxxxxxxxxxxxxxx> wrote:
>
> On 3/3/26 4:01 PM, Pengyu Luo wrote:
> > Parking disp{0,1}_cc_mdss_mdp_clk_src clk broke simplefb on HUAWEI
> > Gaokun3, the image will stuck at grey for seconds until msm takes
> > over framebuffer. Use clk_rcg2_shared_no_init_park_ops to skip it.
>
> Do you have clk_ignore_unused/pd_ignore_unused in your cmdline?
>

Yes, always.

> The sc8280xp-huawei-gaokun3.dts references no clocks in the simplefb
> node, so if you're unlucky with timing, this is ""expected behavior""
>

On gaokun, if simplefb holds the mdp clk, there will not be the early
framebuffer, I can't see it. After seconds, msm initialized, the
display would show logs.

Once I owned another sc8280xp device(Ntmer TW220 aka robo & kala), dsi
didn't work at that time, to bring up the simplefb, the clk must be
held and no parking. gaokun3 always requires no parking only.

BTW, I can see this grey flash without simplefb too. On x13s, if
building msm as a module and not putting the module into the initial
ramdisk, what happens?

Best wishes,
Pengyu