Re: [PATCH 05/10] clk: mediatek: mt8173: Drop flags for main/sys/univpll fixed factors
From: Chen-Yu Tsai
Date: Mon Oct 24 2022 - 19:49:57 EST
On Mon, Oct 24, 2022 at 3:23 AM AngeloGioacchino Del Regno
<angelogioacchino.delregno@xxxxxxxxxxxxx> wrote:
>
> The main/sys/univpll clocks are used as clock sources for multiple
> peripherals of different kind, some of which are critical (like AXIs);
> a rate change on any of these two will produce a rate change on many
> devices and that's likely to produce system instability if not done
> correctly: this is the reason why we have (a lot of) "fixed factor"
> main/sys/univpll divider clocks, used by MUX clocks to provide
> different rates based on PLL output dividers.
>
> Following what was done on clk-mt8186-topckgen and also preventing the
> same GPU DVFS issue, drop CLK_SET_RATE_PARENT from the aforementioned
> clocks.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Reviewed-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>