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Date: Wed, 31 Jul 2019 13:14:41 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Sowjanya Komatineni <skomatineni@...dia.com>,
thierry.reding@...il.com, jonathanh@...dia.com, tglx@...utronix.de,
jason@...edaemon.net, marc.zyngier@....com,
linus.walleij@...aro.org, stefan@...er.ch, mark.rutland@....com
Cc: pdeschrijver@...dia.com, pgaikwad@...dia.com, sboyd@...nel.org,
linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
jckuo@...dia.com, josephl@...dia.com, talho@...dia.com,
linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
mperttunen@...dia.com, spatra@...dia.com, robh+dt@...nel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v7 08/20] clk: tegra: clk-super: Fix to enable PLLP
branches to CPU
31.07.2019 3:20, Sowjanya Komatineni пишет:
> This patch has a fix to enable PLLP branches to CPU before changing
> the CPU clusters clock source to PLLP for Gen5 Super clock and
> disables PLLP branches to CPU when not in use.
>
> During system suspend entry and exit, CPU source will be switched
> to PLLP and this needs PLLP branches to be enabled to CPU prior to
> the switch.
>
> On system resume, warmboot code enables PLLP branches to CPU and
> powers up the CPU with PLLP clock source.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
> drivers/clk/tegra/clk-super.c | 14 ++++++++++++++
> drivers/clk/tegra/clk-tegra-super-gen4.c | 2 +-
> drivers/clk/tegra/clk.c | 14 ++++++++++++++
> drivers/clk/tegra/clk.h | 5 +++++
> 4 files changed, 34 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/tegra/clk-super.c b/drivers/clk/tegra/clk-super.c
> index 39ef31b46df5..e2a1e95a8db7 100644
> --- a/drivers/clk/tegra/clk-super.c
> +++ b/drivers/clk/tegra/clk-super.c
> @@ -28,6 +28,9 @@
> #define super_state_to_src_shift(m, s) ((m->width * s))
> #define super_state_to_src_mask(m) (((1 << m->width) - 1))
>
> +#define CCLK_SRC_PLLP_OUT0 4
> +#define CCLK_SRC_PLLP_OUT4 5
> +
> static u8 clk_super_get_parent(struct clk_hw *hw)
> {
> struct tegra_clk_super_mux *mux = to_clk_super_mux(hw);
> @@ -97,12 +100,23 @@ static int clk_super_set_parent(struct clk_hw *hw, u8 index)
> if (index == mux->div2_index)
> index = mux->pllx_index;
> }
> +
> + /* enable PLLP branches to CPU before selecting PLLP source */
> + if ((mux->flags & TEGRA210_CPU_CLK) &&
> + (index == CCLK_SRC_PLLP_OUT0 || index == CCLK_SRC_PLLP_OUT4))
> + tegra_clk_set_pllp_out_cpu(true);
> +
> val &= ~((super_state_to_src_mask(mux)) << shift);
> val |= (index & (super_state_to_src_mask(mux))) << shift;
>
> writel_relaxed(val, mux->reg);
> udelay(2);
>
> + /* disable PLLP branches to CPU if not used */
> + if ((mux->flags & TEGRA210_CPU_CLK) &&
> + index != CCLK_SRC_PLLP_OUT0 && index != CCLK_SRC_PLLP_OUT4)
> + tegra_clk_set_pllp_out_cpu(false);
> +
> out:
> if (mux->lock)
> spin_unlock_irqrestore(mux->lock, flags);
> diff --git a/drivers/clk/tegra/clk-tegra-super-gen4.c b/drivers/clk/tegra/clk-tegra-super-gen4.c
> index cdfe7c9697e1..888d76b01c75 100644
> --- a/drivers/clk/tegra/clk-tegra-super-gen4.c
> +++ b/drivers/clk/tegra/clk-tegra-super-gen4.c
> @@ -180,7 +180,7 @@ static void __init tegra_super_clk_init(void __iomem *clk_base,
> gen_info->num_cclk_g_parents,
> CLK_SET_RATE_PARENT,
> clk_base + CCLKG_BURST_POLICY,
> - 0, 4, 8, 0, NULL);
> + TEGRA210_CPU_CLK, 4, 8, 0, NULL);
Don't we want a clarifying comment for cclk_lp telling why it doesn't
have the TEGRA210_CPU_CLK flag?
> } else {
> clk = tegra_clk_register_super_mux("cclk_g",
> gen_info->cclk_g_parents,
> diff --git a/drivers/clk/tegra/clk.c b/drivers/clk/tegra/clk.c
> index 573e3c967ae1..eb08047fd02f 100644
> --- a/drivers/clk/tegra/clk.c
> +++ b/drivers/clk/tegra/clk.c
> @@ -23,6 +23,7 @@
> #define CLK_OUT_ENB_W 0x364
> #define CLK_OUT_ENB_X 0x280
> #define CLK_OUT_ENB_Y 0x298
> +#define CLK_ENB_PLLP_OUT_CPU BIT(31)
> #define CLK_OUT_ENB_SET_L 0x320
> #define CLK_OUT_ENB_CLR_L 0x324
> #define CLK_OUT_ENB_SET_H 0x328
> @@ -199,6 +200,19 @@ const struct tegra_clk_periph_regs *get_reg_bank(int clkid)
> }
> }
>
> +void tegra_clk_set_pllp_out_cpu(bool enable)
> +{
> + u32 val;
> +
> + val = readl_relaxed(clk_base + CLK_OUT_ENB_Y);
> + if (enable)
> + val |= CLK_ENB_PLLP_OUT_CPU;
> + else
> + val &= ~CLK_ENB_PLLP_OUT_CPU;
> +
> + writel_relaxed(val, clk_base + CLK_OUT_ENB_Y);
> +}
> +
> struct clk ** __init tegra_clk_init(void __iomem *regs, int num, int banks)
> {
> clk_base = regs;
> diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
> index d61e61eebf4a..f8de447f505b 100644
> --- a/drivers/clk/tegra/clk.h
> +++ b/drivers/clk/tegra/clk.h
> @@ -687,6 +687,9 @@ struct clk *tegra_clk_register_periph_data(void __iomem *clk_base,
> * Flags:
> * TEGRA_DIVIDER_2 - LP cluster has additional divider. This flag indicates
> * that this is LP cluster clock.
> + * TEGRA210_CPU_CLK - This flag indicates this is CPU cluster clock. To use
> + * PLLP for CPU clock source, need to enable PLLP branches to CPU by setting
> + * additional bit PLLP_OUT_CPU for gen5 super clock.
> */
> struct tegra_clk_super_mux {
> struct clk_hw hw;
> @@ -703,6 +706,7 @@ struct tegra_clk_super_mux {
> #define to_clk_super_mux(_hw) container_of(_hw, struct tegra_clk_super_mux, hw)
>
> #define TEGRA_DIVIDER_2 BIT(0)
> +#define TEGRA210_CPU_CLK BIT(1)
>
> extern const struct clk_ops tegra_clk_super_ops;
> struct clk *tegra_clk_register_super_mux(const char *name,
> @@ -849,6 +853,7 @@ int tegra_pll_p_div_to_hw(struct tegra_clk_pll *pll, u8 p_div);
> int div_frac_get(unsigned long rate, unsigned parent_rate, u8 width,
> u8 frac_width, u8 flags);
> void tegra_clk_osc_resume(void __iomem *clk_base);
> +void tegra_clk_set_pllp_out_cpu(bool enable);
>
>
> /* Combined read fence with delay */
>
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