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Date: Sun, 15 Dec 2019 22:13:18 +0800
From: Zhou Yanjie <zhouyanjie@...yeetech.com>
To: Paul Cercueil <paul@...pouillou.net>
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 v3 2/5] clk: Ingenic: Adjust cgu code to make it
compatible with X1830.
Hi Paul,
On 2019年12月15日 02:09, Paul Cercueil wrote:
> 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.
>
OK, I will merge it in v4.
> -Paul
>
>
> Le sam., déc. 14, 2019 at 23:33, 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.
>>
>> 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
>>
>
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