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Date: Fri, 13 Dec 2019 22:25:01 +0100
From: Paul Cercueil <paul@...pouillou.net>
To: 周琰杰 "(Zhou Yanjie)"
<zhouyanjie@...yeetech.com>
Cc: linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
robh+dt@...nel.org, paul.burton@...s.com, paulburton@...nel.org,
mturquette@...libre.com, sboyd@...nel.org, mark.rutland@....com,
sernia.zhou@...mail.com, zhenwenjin@...il.com
Subject: Re: [PATCH v2 1/5] clk: Ingenic: Adjust cgu code to make it
compatible with X1830.
Hi Zhou,
Le ven., déc. 13, 2019 at 23:21, 周琰杰 (Zhou Yanjie)
<zhouyanjie@...yeetech.com> a écrit :
> The PLL of X1830 Soc from Ingenic has been greatly changed,
> the bypass control is placed in another register, so now two
> registers may needed to control the PLL. To this end, the
> original "reg" was changed to "pll_reg", and a new "bypass_reg"
> was introduced. In addition, when calculating rate, the PLL of
> X1830 introduced an extra 2x multiplier, so a new "rate_multiplier"
> was introduced.
>
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> ---
>
> Notes:
> v1->v2:
> 1.Use two fields (pll_reg & bypass_reg) instead of the 2-values
> array (reg[2]).
> 2.Remove the "pll_info->version" and add a
> "pll_info->rate_multiplier".
> 3.Fix the coding style and add more detailed commit message.
> 4.Change my Signed-off-by from "Zhou Yanjie <zhouyanjie@...o.com>"
> to "周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>" because
> the old mailbox is in an unstable state.
>
> drivers/clk/ingenic/cgu.c | 32 +++++++++++++++++++++-----------
> drivers/clk/ingenic/cgu.h | 8 ++++++--
> 2 files changed, 27 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
> index 6e96303..ae1ddcb 100644
> --- a/drivers/clk/ingenic/cgu.c
> +++ b/drivers/clk/ingenic/cgu.c
> @@ -84,7 +84,7 @@ ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned
> long parent_rate)
> pll_info = &clk_info->pll;
>
> spin_lock_irqsave(&cgu->lock, flags);
> - ctl = readl(cgu->base + pll_info->reg);
> + ctl = readl(cgu->base + pll_info->pll_reg);
> spin_unlock_irqrestore(&cgu->lock, flags);
>
> m = (ctl >> pll_info->m_shift) & GENMASK(pll_info->m_bits - 1, 0);
> @@ -93,6 +93,11 @@ ingenic_pll_recalc_rate(struct clk_hw *hw,
> unsigned long parent_rate)
> n += pll_info->n_offset;
> od_enc = ctl >> pll_info->od_shift;
> od_enc &= GENMASK(pll_info->od_bits - 1, 0);
> +
> + spin_lock_irqsave(&cgu->lock, flags);
> + ctl = readl(cgu->base + pll_info->bypass_reg);
> + spin_unlock_irqrestore(&cgu->lock, flags);
I think you should start the patchset with the current [5/5] patch;
then you wouldn't have to add spinlock protection here just to see it
removed later in the same patchset.
Cheers,
-Paul
> +
> bypass = !pll_info->no_bypass_bit &&
> !!(ctl & BIT(pll_info->bypass_bit));
>
> @@ -106,7 +111,7 @@ ingenic_pll_recalc_rate(struct clk_hw *hw,
> unsigned long parent_rate)
> BUG_ON(od == pll_info->od_max);
> od++;
>
> - return div_u64((u64)parent_rate * m, n * od);
> + return div_u64((u64)parent_rate * m * pll_info->rate_multiplier, n
> * od);
> }
>
> static unsigned long
> @@ -139,7 +144,7 @@ ingenic_pll_calc(const struct
> ingenic_cgu_clk_info *clk_info,
> if (pod)
> *pod = od;
>
> - return div_u64((u64)parent_rate * m, n * od);
> + return div_u64((u64)parent_rate * m * pll_info->rate_multiplier, n
> * od);
> }
>
> static inline const struct ingenic_cgu_clk_info *to_clk_info(
> @@ -183,7 +188,7 @@ ingenic_pll_set_rate(struct clk_hw *hw, unsigned
> long req_rate,
> clk_info->name, req_rate, rate);
>
> spin_lock_irqsave(&cgu->lock, flags);
> - ctl = readl(cgu->base + pll_info->reg);
> + ctl = readl(cgu->base + pll_info->pll_reg);
>
> ctl &= ~(GENMASK(pll_info->m_bits - 1, 0) << pll_info->m_shift);
> ctl |= (m - pll_info->m_offset) << pll_info->m_shift;
> @@ -194,7 +199,7 @@ ingenic_pll_set_rate(struct clk_hw *hw, unsigned
> long req_rate,
> ctl &= ~(GENMASK(pll_info->od_bits - 1, 0) << pll_info->od_shift);
> ctl |= pll_info->od_encoding[od - 1] << pll_info->od_shift;
>
> - writel(ctl, cgu->base + pll_info->reg);
> + writel(ctl, cgu->base + pll_info->pll_reg);
> spin_unlock_irqrestore(&cgu->lock, flags);
>
> return 0;
> @@ -212,16 +217,21 @@ static int ingenic_pll_enable(struct clk_hw *hw)
> u32 ctl;
>
> spin_lock_irqsave(&cgu->lock, flags);
> - ctl = readl(cgu->base + pll_info->reg);
> + ctl = readl(cgu->base + pll_info->bypass_reg);
>
> ctl &= ~BIT(pll_info->bypass_bit);
> +
> + writel(ctl, cgu->base + pll_info->bypass_reg);
> +
> + ctl = readl(cgu->base + pll_info->pll_reg);
> +
> ctl |= BIT(pll_info->enable_bit);
>
> - writel(ctl, cgu->base + pll_info->reg);
> + writel(ctl, cgu->base + pll_info->pll_reg);
>
> /* wait for the PLL to stabilise */
> for (i = 0; i < timeout; i++) {
> - ctl = readl(cgu->base + pll_info->reg);
> + ctl = readl(cgu->base + pll_info->pll_reg);
> if (ctl & BIT(pll_info->stable_bit))
> break;
> mdelay(1);
> @@ -245,11 +255,11 @@ static void ingenic_pll_disable(struct clk_hw
> *hw)
> u32 ctl;
>
> spin_lock_irqsave(&cgu->lock, flags);
> - ctl = readl(cgu->base + pll_info->reg);
> + ctl = readl(cgu->base + pll_info->pll_reg);
>
> ctl &= ~BIT(pll_info->enable_bit);
>
> - writel(ctl, cgu->base + pll_info->reg);
> + writel(ctl, cgu->base + pll_info->pll_reg);
> spin_unlock_irqrestore(&cgu->lock, flags);
> }
>
> @@ -263,7 +273,7 @@ static int ingenic_pll_is_enabled(struct clk_hw
> *hw)
> u32 ctl;
>
> spin_lock_irqsave(&cgu->lock, flags);
> - ctl = readl(cgu->base + pll_info->reg);
> + ctl = readl(cgu->base + pll_info->pll_reg);
> spin_unlock_irqrestore(&cgu->lock, flags);
>
> return !!(ctl & BIT(pll_info->enable_bit));
> diff --git a/drivers/clk/ingenic/cgu.h b/drivers/clk/ingenic/cgu.h
> index 0dc8004..f7b6908 100644
> --- a/drivers/clk/ingenic/cgu.h
> +++ b/drivers/clk/ingenic/cgu.h
> @@ -16,7 +16,9 @@
>
> /**
> * struct ingenic_cgu_pll_info - information about a PLL
> - * @reg: the offset of the PLL's control register within the CGU
> + * @pll_reg: the offset of the PLL's control register within the CGU
> + * @bypass_reg: the offset of the bypass control register within the
> CGU
> + * @rate_multiplier: the multiplier needed by pll rate calculation
> * @m_shift: the number of bits to shift the multiplier value by
> (ie. the
> * index of the lowest bit of the multiplier value in the
> PLL's
> * control register)
> @@ -43,7 +45,9 @@
> * @no_bypass_bit: if set, the PLL has no bypass functionality
> */
> struct ingenic_cgu_pll_info {
> - unsigned reg;
> + unsigned pll_reg;
> + unsigned bypass_reg;
> + unsigned rate_multiplier;
> const s8 *od_encoding;
> u8 m_shift, m_bits, m_offset;
> u8 n_shift, n_bits, n_offset;
> --
> 2.7.4
>
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