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Message-ID: <20150427141019.GF3097@tbergstrom-lnx.Nvidia.com>
Date: Mon, 27 Apr 2015 17:10:19 +0300
From: Peter De Schrijver <pdeschrijver@...dia.com>
To: Rhyland Klein <rklein@...dia.com>
CC: Mike Turquette <mturquette@...aro.org>,
Stephen Warren <swarren@...dotorg.org>,
Stephen Boyd <sboyd@...eaurora.org>,
Thierry Reding <thierry.reding@...il.com>,
Alexandre Courbot <gnurou@...il.com>,
Bill Huang <bilhuang@...dia.com>,
Paul Walmsley <pwalmsley@...dia.com>,
<linux-clk@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 13/19] clk: tegra: pll: Add support for PLLMB for T210
On Fri, Apr 24, 2015 at 12:47:53PM -0400, Rhyland Klein wrote:
> Tegra210 SoC's have a backup PLL for memory usage, PLLMB. Add
> plumbing to register and handle it.
>
I think this would be better rephrased as:
'Tegra210 SoC's have 2 PLLs for memory usage. Add plumbing to register and
handle PLLMB.'
The whole point of PLLMB is exactly that it allows switching between 2 PLLMs
without having to use an intermediate backup PLL, because the PLL has to have
locked before we can switch to it.
> Signed-off-by: Rhyland Klein <rklein@...dia.com>
> ---
> drivers/clk/tegra/clk-pll.c | 46 +++++++++++++++++++++++++++++++++++++++----
> drivers/clk/tegra/clk.h | 9 +++++++++
> 2 files changed, 51 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
> index de9e035b59c9..4a248ee1861c 100644
> --- a/drivers/clk/tegra/clk-pll.c
> +++ b/drivers/clk/tegra/clk-pll.c
> @@ -549,7 +549,7 @@ static void _update_pll_mnp(struct tegra_clk_pll *pll,
> struct tegra_clk_pll_params *params = pll->params;
> struct div_nmp *div_nmp = params->div_nmp;
>
> - if ((params->flags & TEGRA_PLLM) &&
> + if ((params->flags & (TEGRA_PLLM | TEGRA_PLLMB)) &&
> (pll_override_readl(PMC_PLLP_WB0_OVERRIDE, pll) &
> PMC_PLLP_WB0_OVERRIDE_PLLM_OVERRIDE)) {
> val = pll_override_readl(params->pmc_divp_reg, pll);
> @@ -586,7 +586,7 @@ static void _get_pll_mnp(struct tegra_clk_pll *pll,
> struct tegra_clk_pll_params *params = pll->params;
> struct div_nmp *div_nmp = params->div_nmp;
>
> - if ((params->flags & TEGRA_PLLM) &&
> + if ((params->flags & (TEGRA_PLLM | TEGRA_PLLMB)) &&
> (pll_override_readl(PMC_PLLP_WB0_OVERRIDE, pll) &
> PMC_PLLP_WB0_OVERRIDE_PLLM_OVERRIDE)) {
> val = pll_override_readl(params->pmc_divp_reg, pll);
> @@ -732,8 +732,8 @@ static long clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> if (pll->params->flags & TEGRA_PLL_FIXED)
> return pll->params->fixed_rate;
>
> - /* PLLM is used for memory; we do not change rate */
> - if (pll->params->flags & TEGRA_PLLM)
> + /* PLLM/MB are used for memory; we do not change rate */
> + if (pll->params->flags & (TEGRA_PLLM | TEGRA_PLLMB))
> return __clk_get_rate(hw->clk);
>
> if (_get_table_rate(hw, &cfg, rate, *prate) &&
> @@ -2297,4 +2297,42 @@ struct clk *tegra_clk_register_pllss_tegra210(const char *name,
>
> return clk;
> }
> +
> +struct clk *tegra_clk_register_pllmb(const char *name, const char *parent_name,
> + void __iomem *clk_base, void __iomem *pmc,
> + unsigned long flags,
> + struct tegra_clk_pll_params *pll_params,
> + spinlock_t *lock)
> +{
> + struct tegra_clk_pll *pll;
> + struct clk *clk, *parent;
> + unsigned long parent_rate;
> +
> + if (!pll_params->pdiv_tohw)
> + return ERR_PTR(-EINVAL);
> +
> + parent = __clk_lookup(parent_name);
> + if (!parent) {
> + WARN(1, "parent clk %s of %s must be registered first\n",
> + name, parent_name);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + parent_rate = __clk_get_rate(parent);
> +
> + pll_params->vco_min = _clip_vco_min(pll_params->vco_min, parent_rate);
> +
> + pll_params->flags |= TEGRA_PLL_BYPASS;
> + pll_params->flags |= TEGRA_PLLMB;
> + pll = _tegra_init_pll(clk_base, pmc, pll_params, lock);
> + if (IS_ERR(pll))
> + return ERR_CAST(pll);
> +
> + clk = _tegra_clk_register_pll(pll, name, parent_name, flags,
> + &tegra_clk_pllm_ops);
> + if (IS_ERR(clk))
> + kfree(pll);
> +
> + return clk;
> +}
> #endif
> diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
> index 26e31580dc9e..9e37defb063f 100644
> --- a/drivers/clk/tegra/clk.h
> +++ b/drivers/clk/tegra/clk.h
> @@ -201,6 +201,8 @@ struct div_nmp {
> * TEGRA_PLL_HAS_LOCK_ENABLE - PLL has bit to enable lock monitoring
> * TEGRA_MDIV_NEW - Switch to new method for calculating fixed mdiv
> * it may be more accurate (especially if SDM present)
> + * TEGRA_PLLMB - PLLMB has should be treated similar to PLLM. This
> + * flag indicated that it is PLLMB.
> */
> struct tegra_clk_pll_params {
> unsigned long input_min;
> @@ -260,6 +262,7 @@ struct tegra_clk_pll_params {
> #define TEGRA_PLL_BYPASS BIT(9)
> #define TEGRA_PLL_HAS_LOCK_ENABLE BIT(10)
> #define TEGRA_MDIV_NEW BIT(11)
> +#define TEGRA_PLLMB BIT(12)
>
> /**
> * struct tegra_clk_pll - Tegra PLL clock
> @@ -366,6 +369,12 @@ struct clk *tegra_clk_register_pllss(const char *name, const char *parent_name,
> struct tegra_clk_pll_params *pll_params,
> spinlock_t *lock);
>
> +struct clk *tegra_clk_register_pllmb(const char *name, const char *parent_name,
> + void __iomem *clk_base, void __iomem *pmc,
> + unsigned long flags,
> + struct tegra_clk_pll_params *pll_params,
> + spinlock_t *lock);
> +
> /**
> * struct tegra_clk_pll_out - PLL divider down clock
> *
> --
> 1.7.9.5
>
--
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