Re: [PATCH v2 3/6] clk: sunxi-ng: nkm: Support minimum and maximum rate

Jernej Škrabec
2024-02-05T17:56:13Z

Dne ponedeljek, 05. februar 2024 ob 16:22:26 CET je Frank Oltmanns napisal(a):
> According to the Allwinner User Manual, the Allwinner A64 requires
> PLL-MIPI to run at 500MHz-1.4GHz. Add support for that to ccu_nkm.
>
> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
> ---
> drivers/clk/sunxi-ng/ccu_nkm.c | 13 +++++++++++++
> drivers/clk/sunxi-ng/ccu_nkm.h | 2 ++
> 2 files changed, 15 insertions(+)
>
> diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
> index 1168d894d636..7d135908d6e0 100644
> --- a/drivers/clk/sunxi-ng/ccu_nkm.c
> +++ b/drivers/clk/sunxi-ng/ccu_nkm.c
> @@ -181,6 +181,12 @@ static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
> if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
> rate *= nkm->fixed_post_div;
>
> + if (nkm->min_rate && rate < nkm->min_rate)
> + rate = nkm->min_rate;
> +
> + if (nkm->max_rate && rate > nkm->max_rate)
> + rate = nkm->max_rate;

Please take a look at ccu_nm_round_rate() code. You need to consider postdiv
and you can return immediately.

> +
> if (!clk_hw_can_set_rate_parent(&nkm->common.hw))
> rate = ccu_nkm_find_best(*parent_rate, rate, &_nkm, &nkm->common);
> else
> @@ -220,6 +226,13 @@ static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate,
> _nkm.min_m = 1;
> _nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
>
> +
> + if (nkm->min_rate && rate < nkm->min_rate)
> + rate = nkm->min_rate;
> +
> + if (nkm->max_rate && rate > nkm->max_rate)
> + rate = nkm->max_rate;
> +

No need for this, clk subsystem calls round rate before setting actual clock
rate.

Best regards,
Jernej

> ccu_nkm_find_best(parent_rate, rate, &_nkm, &nkm->common);
>
> spin_lock_irqsave(nkm->common.lock, flags);
> diff --git a/drivers/clk/sunxi-ng/ccu_nkm.h b/drivers/clk/sunxi-ng/ccu_nkm.h
> index c409212ee40e..358a9df6b6a0 100644
> --- a/drivers/clk/sunxi-ng/ccu_nkm.h
> +++ b/drivers/clk/sunxi-ng/ccu_nkm.h
> @@ -27,6 +27,8 @@ struct ccu_nkm {
> struct ccu_mux_internal mux;
>
> unsigned int fixed_post_div;
> + unsigned long min_rate;
> + unsigned long max_rate;
> unsigned long max_m_n_ratio;
> unsigned long min_parent_m_ratio;
>
>
>