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From: Paul Cercueil <paul@crapouillou.net>
To: "周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>
Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-clk@vger.kernel.org, devicetree@vger.kernel.org,
	robh+dt@kernel.org, paul.burton@mips.com, paulburton@kernel.org,
	mturquette@baylibre.com, sboyd@kernel.org, mark.rutland@arm.com,
	sernia.zhou@foxmail.com, zhenwenjin@gmail.com
Subject: Re: [PATCH v3 2/5] clk: Ingenic: Adjust cgu code to make it compatible with X1830.
Date: Sat, 14 Dec 2019 19:09:47 +0100	[thread overview]
Message-ID: <1576346987.3.2@crapouillou.net> (raw)
In-Reply-To: <1576337630-78576-4-git-send-email-zhouyanjie@wanyeetech.com>

Hi Zhou,

The patch looks good but it should be merged with [3/5]. Because right 
now it is not atomic, if you only have the first two patches applied 
the kernel won't compile.

-Paul


Le sam., déc. 14, 2019 at 23:33, 周琰杰 (Zhou Yanjie) 
<zhouyanjie@wanyeetech.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@wanyeetech.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@zoho.com>"
>       to "周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>" because
>       the old mailbox is in an unstable state.
> 
>     v2->v3:
>     Adjust order from [1/5] in v2 to [2/5] in v3.
> 
>  drivers/clk/ingenic/cgu.c | 30 +++++++++++++++++++-----------
>  drivers/clk/ingenic/cgu.h |  8 ++++++--
>  2 files changed, 25 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
> index 8bd3998..3c95451 100644
> --- a/drivers/clk/ingenic/cgu.c
> +++ b/drivers/clk/ingenic/cgu.c
> @@ -82,7 +82,7 @@ ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned 
> long parent_rate)
>  	BUG_ON(clk_info->type != CGU_CLK_PLL);
>  	pll_info = &clk_info->pll;
> 
> -	ctl = readl(cgu->base + pll_info->reg);
> +	ctl = readl(cgu->base + pll_info->pll_reg);
> 
>  	m = (ctl >> pll_info->m_shift) & GENMASK(pll_info->m_bits - 1, 0);
>  	m += pll_info->m_offset;
> @@ -90,6 +90,9 @@ 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);
> +
> +	ctl = readl(cgu->base + pll_info->bypass_reg);
> +
>  	bypass = !pll_info->no_bypass_bit &&
>  		 !!(ctl & BIT(pll_info->bypass_bit));
> 
> @@ -103,7 +106,7 @@ 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
> @@ -136,7 +139,7 @@ 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(
> @@ -180,7 +183,7 @@ 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;
> @@ -191,7 +194,7 @@ 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;
> @@ -209,16 +212,21 @@ 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);
> @@ -242,11 +250,11 @@ 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);
>  }
> 
> @@ -258,7 +266,7 @@ static int ingenic_pll_is_enabled(struct clk_hw 
> *hw)
>  	const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
>  	u32 ctl;
> 
> -	ctl = readl(cgu->base + pll_info->reg);
> +	ctl = readl(cgu->base + pll_info->pll_reg);
> 
>  	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
> 



  reply	other threads:[~2019-12-14 18:09 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-14 15:33 Add support for the X1830 v3 周琰杰 (Zhou Yanjie)
2019-12-14 15:33 ` [PATCH v3 0/5] clk: Ingenic: " 周琰杰 (Zhou Yanjie)
2019-12-14 15:33 ` [PATCH v3 1/5] clk: Ingenic: Remove unnecessary spinlock when reading registers 周琰杰 (Zhou Yanjie)
2019-12-14 18:07   ` Paul Cercueil
2019-12-15 14:11     ` Zhou Yanjie
2019-12-14 15:33 ` [PATCH v3 2/5] clk: Ingenic: Adjust cgu code to make it compatible with X1830 周琰杰 (Zhou Yanjie)
2019-12-14 18:09   ` Paul Cercueil [this message]
2019-12-15 14:13     ` Zhou Yanjie
2019-12-14 15:33 ` [PATCH v3 3/5] clk: Ingenic: Adjust code to make it compatible with new cgu code 周琰杰 (Zhou Yanjie)
2019-12-14 15:33 ` [PATCH v3 4/5] dt-bindings: clock: Add X1830 bindings 周琰杰 (Zhou Yanjie)
2019-12-14 15:33 ` [PATCH v3 5/5] clk: Ingenic: Add CGU driver for X1830 周琰杰 (Zhou Yanjie)

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