Re: [PATCH 2/5] clk: mediatek: clk-mt8188-topckgen: Remove univpll from parents of mfg_core_tmp

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Il 20/09/24 15:41, Pablo Sun ha scritto:
Same as MT8195, MT8188 GPU clock is primarly supplied by the dedicated
mfgpll. The clock "mfg_core_tmp" is only used as an alt clock when
setting mfgpll clock rate.

If we keep the univpll parents from mfg_core_tmp, when setting
GPU frequency to 390000000, the common clock framework would switch
the parent to univpll, instead of setting mfgpll to 390000000:

     mfgpll                            0        0        0   949999756
     univpll                           2        2        0  2340000000
        univpll_d6                     1        1        0   390000000
           top_mfg_core_tmp            1        1        0   390000000
              mfg_ck_fast_ref          1        1        0   390000000
                 mfgcfg_bg3d           1        1        0   390000000

This results in failures when subsequent devfreq operations need to
switch to other frequencies. So remove univpll from the parent list.

This solution is taken from commit 72d38ed720e9 ("clk: mediatek:
clk-mt8195-topckgen: Drop univplls from mfg mux parents")

Signed-off-by: Pablo Sun <pablo.sun@xxxxxxxxxxxx>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>






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