Re: [PATCH 1/5] clk: Ingenic: Adjust code to make it compatible with X1830.

Paul Cercueil
2019-11-27T17:37:47Z

Hi Zhou,

Le mer., nov. 27, 2019 at 11:32, Zhou Yanjie <zhouyanjie@zoho.com> a
écrit :
> 1.Adjust the PLL related code in "cgu.c" and "cgu.h" to make it
> compatible with the X1830 Soc from Ingenic.
> 2.Adjust the code in "jz4740-cgu.c" to be compatible with the
> new cgu code.
> 3.Adjust the code in "jz4725b-cgu.c" to be compatible with the
> new cgu code.
> 4.Adjust the code in "jz4770-cgu.c" to be compatible with the
> new cgu code.
> 5.Adjust the code in "jz4780-cgu.c" to be compatible with the
> new cgu code.
> 6.Adjust the code in "x1000-cgu.c" to be compatible with the
> new cgu code.
>
> Signed-off-by: Zhou Yanjie <zhouyanjie@zoho.com>
> ---
> drivers/clk/ingenic/cgu.c | 55
> +++++++++++++++++++++++++++++----------
> drivers/clk/ingenic/cgu.h | 12 ++++++++-
> drivers/clk/ingenic/jz4725b-cgu.c | 3 ++-
> drivers/clk/ingenic/jz4740-cgu.c | 3 ++-
> drivers/clk/ingenic/jz4770-cgu.c | 6 +++--
> drivers/clk/ingenic/jz4780-cgu.c | 3 ++-
> drivers/clk/ingenic/x1000-cgu.c | 6 +++--
> 7 files changed, 66 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
> index 6e96303..c3c69a8 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->reg[1]);

I really don't like this patch. There is no info on what reg[1] and
reg[0] are. First, don't use hardcoded numbers, use macros with
meaningful names. Second, why not just have two fields instead of one
2-values array? That would remove a lot of the noise.

> spin_unlock_irqrestore(&cgu->lock, flags);
>
> m = (ctl >> pll_info->m_shift) & GENMASK(pll_info->m_bits - 1, 0);
> @@ -93,8 +93,17 @@ 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);
> - bypass = !pll_info->no_bypass_bit &&
> - !!(ctl & BIT(pll_info->bypass_bit));
> +
> + if (pll_info->version >= CGU_X1830) {
> + spin_lock_irqsave(&cgu->lock, flags);
> + ctl = readl(cgu->base + pll_info->reg[0]);
> + spin_unlock_irqrestore(&cgu->lock, flags);

Why the spinlock?

> +
> + bypass = !pll_info->no_bypass_bit &&
> + !!(ctl & BIT(pll_info->bypass_bit));
> + } else

Please comply to the kernel coding style - use brackets after the else.

> + bypass = !pll_info->no_bypass_bit &&
> + !!(ctl & BIT(pll_info->bypass_bit));
>
> if (bypass)
> return parent_rate;
> @@ -106,7 +115,10 @@ 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);
> + if (pll_info->version >= CGU_X1830)
> + return div_u64((u64)parent_rate * m * 2, n * od);

Where does that *2 come from?

> + else
> + return div_u64((u64)parent_rate * m, n * od);
> }
>
> static unsigned long
> @@ -139,7 +151,10 @@ ingenic_pll_calc(const struct
> ingenic_cgu_clk_info *clk_info,
> if (pod)
> *pod = od;
>
> - return div_u64((u64)parent_rate * m, n * od);
> + if (pll_info->version >= CGU_X1830)
> + return div_u64((u64)parent_rate * m * 2, n * od);
> + else
> + return div_u64((u64)parent_rate * m, n * od);
> }
>
> static inline const struct ingenic_cgu_clk_info *to_clk_info(
> @@ -183,7 +198,7 @@ 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->reg[1]);
>
> ctl &= ~(GENMASK(pll_info->m_bits - 1, 0) << pll_info->m_shift);
> ctl |= (m - pll_info->m_offset) << pll_info->m_shift;
> @@ -194,7 +209,7 @@ 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->reg[1]);
> spin_unlock_irqrestore(&cgu->lock, flags);
>
> return 0;
> @@ -212,16 +227,28 @@ 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 &= ~BIT(pll_info->bypass_bit);
> + if (pll_info->version >= CGU_X1830) {
> + ctl = readl(cgu->base + pll_info->reg[0]);
> +
> + ctl &= ~BIT(pll_info->bypass_bit);
> +
> + writel(ctl, cgu->base + pll_info->reg[0]);
> +
> + ctl = readl(cgu->base + pll_info->reg[1]);
> + } else {
> + ctl = readl(cgu->base + pll_info->reg[1]);
> +
> + ctl &= ~BIT(pll_info->bypass_bit);
> + }
> +
> ctl |= BIT(pll_info->enable_bit);
>
> - writel(ctl, cgu->base + pll_info->reg);
> + writel(ctl, cgu->base + pll_info->reg[1]);
>
> /* 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->reg[1]);
> if (ctl & BIT(pll_info->stable_bit))
> break;
> mdelay(1);
> @@ -245,11 +272,11 @@ 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->reg[1]);
>
> ctl &= ~BIT(pll_info->enable_bit);
>
> - writel(ctl, cgu->base + pll_info->reg);
> + writel(ctl, cgu->base + pll_info->reg[1]);
> spin_unlock_irqrestore(&cgu->lock, flags);
> }
>
> @@ -263,7 +290,7 @@ 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->reg[1]);
> 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..5f87be4 100644
> --- a/drivers/clk/ingenic/cgu.h
> +++ b/drivers/clk/ingenic/cgu.h
> @@ -42,8 +42,18 @@
> * @stable_bit: the index of the stable bit in the PLL control
> register
> * @no_bypass_bit: if set, the PLL has no bypass functionality
> */
> +enum ingenic_cgu_version {
> + CGU_JZ4740,
> + CGU_JZ4725B,
> + CGU_JZ4770,
> + CGU_JZ4780,
> + CGU_X1000,
> + CGU_X1830,
> +};
> +
> struct ingenic_cgu_pll_info {
> - unsigned reg;
> + enum ingenic_cgu_version version;
> + unsigned reg[2];
> const s8 *od_encoding;
> u8 m_shift, m_bits, m_offset;
> u8 n_shift, n_bits, n_offset;
> diff --git a/drivers/clk/ingenic/jz4725b-cgu.c
> b/drivers/clk/ingenic/jz4725b-cgu.c
> index a3b4635..6da7b41 100644
> --- a/drivers/clk/ingenic/jz4725b-cgu.c
> +++ b/drivers/clk/ingenic/jz4725b-cgu.c
> @@ -53,7 +53,8 @@ static const struct ingenic_cgu_clk_info
> jz4725b_cgu_clocks[] = {
> "pll", CGU_CLK_PLL,
> .parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
> .pll = {
> - .reg = CGU_REG_CPPCR,
> + .version = CGU_JZ4725B,
> + .reg = { -1, CGU_REG_CPPCR },
> .m_shift = 23,
> .m_bits = 9,
> .m_offset = 2,
> diff --git a/drivers/clk/ingenic/jz4740-cgu.c
> b/drivers/clk/ingenic/jz4740-cgu.c
> index 4f0e92c..3cf800d 100644
> --- a/drivers/clk/ingenic/jz4740-cgu.c
> +++ b/drivers/clk/ingenic/jz4740-cgu.c
> @@ -68,7 +68,8 @@ static const struct ingenic_cgu_clk_info
> jz4740_cgu_clocks[] = {
> "pll", CGU_CLK_PLL,
> .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
> .pll = {
> - .reg = CGU_REG_CPPCR,
> + .version = CGU_JZ4740,
> + .reg = { -1, CGU_REG_CPPCR },
> .m_shift = 23,
> .m_bits = 9,
> .m_offset = 2,
> diff --git a/drivers/clk/ingenic/jz4770-cgu.c
> b/drivers/clk/ingenic/jz4770-cgu.c
> index 956dd65..a62dfb1 100644
> --- a/drivers/clk/ingenic/jz4770-cgu.c
> +++ b/drivers/clk/ingenic/jz4770-cgu.c
> @@ -101,7 +101,8 @@ static const struct ingenic_cgu_clk_info
> jz4770_cgu_clocks[] = {
> "pll0", CGU_CLK_PLL,
> .parents = { JZ4770_CLK_EXT },
> .pll = {
> - .reg = CGU_REG_CPPCR0,
> + .version = CGU_JZ4770,
> + .reg = { -1, CGU_REG_CPPCR0 },
> .m_shift = 24,
> .m_bits = 7,
> .m_offset = 1,
> @@ -123,7 +124,8 @@ static const struct ingenic_cgu_clk_info
> jz4770_cgu_clocks[] = {
> "pll1", CGU_CLK_PLL,
> .parents = { JZ4770_CLK_EXT },
> .pll = {
> - .reg = CGU_REG_CPPCR1,
> + .version = CGU_JZ4770,
> + .reg = { -1, CGU_REG_CPPCR1 },
> .m_shift = 24,
> .m_bits = 7,
> .m_offset = 1,
> diff --git a/drivers/clk/ingenic/jz4780-cgu.c
> b/drivers/clk/ingenic/jz4780-cgu.c
> index ea905ff..59356d1b 100644
> --- a/drivers/clk/ingenic/jz4780-cgu.c
> +++ b/drivers/clk/ingenic/jz4780-cgu.c
> @@ -220,7 +220,8 @@ static const struct ingenic_cgu_clk_info
> jz4780_cgu_clocks[] = {
> /* PLLs */
>
> #define DEF_PLL(name) { \
> - .reg = CGU_REG_ ## name, \
> + .version = CGU_JZ4780, \
> + .reg = { -1, CGU_REG_ ## name }, \
> .m_shift = 19, \
> .m_bits = 13, \
> .m_offset = 1, \
> diff --git a/drivers/clk/ingenic/x1000-cgu.c
> b/drivers/clk/ingenic/x1000-cgu.c
> index b22d87b..7179b9f 100644
> --- a/drivers/clk/ingenic/x1000-cgu.c
> +++ b/drivers/clk/ingenic/x1000-cgu.c
> @@ -57,7 +57,8 @@ static const struct ingenic_cgu_clk_info
> x1000_cgu_clocks[] = {
> "apll", CGU_CLK_PLL,
> .parents = { X1000_CLK_EXCLK, -1, -1, -1 },
> .pll = {
> - .reg = CGU_REG_APLL,
> + .version = CGU_X1000,
> + .reg = { -1, CGU_REG_APLL },
> .m_shift = 24,
> .m_bits = 7,
> .m_offset = 1,
> @@ -78,7 +79,8 @@ static const struct ingenic_cgu_clk_info
> x1000_cgu_clocks[] = {
> "mpll", CGU_CLK_PLL,
> .parents = { X1000_CLK_EXCLK, -1, -1, -1 },
> .pll = {
> - .reg = CGU_REG_MPLL,
> + .version = CGU_X1000,
> + .reg = { -1, CGU_REG_MPLL },
> .m_shift = 24,
> .m_bits = 7,
> .m_offset = 1,
> --
> 2.7.4
>
>