[PATCH 16/19] clk: tegra: pll: Add Set_default logic

[Rhyland Klein <rklein@nvidia.com>]

From: Bill Huang <bilhuang@nvidia.com>

Add logic which (if specified for a pll) can verify that a PLL is set
to the proper default value and if not can set it. This can be
specified per PLL as each will have different default values.

Signed-off-by: Bill Huang <bilhuang@nvidia.com>
---
 drivers/clk/tegra/clk-pll.c |   46 ++++++++++++++++++++++++++++++++-----------
 drivers/clk/tegra/clk.h     |   15 ++++++++++++++
 2 files changed, 50 insertions(+), 11 deletions(-)

diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 9acd858e0c5b..68b42be060c7 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -660,15 +660,28 @@ static int _program_pll(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
 			unsigned long rate)
 {
 	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	struct tegra_clk_pll_freq_table old_cfg;
 	int state, ret = 0;
 
 	state = clk_pll_is_enabled(hw);
 
+	_get_pll_mnp(pll, &old_cfg);
+
+	if (state && pll->params->defaults_set && pll->params->dyn_ramp &&
+			(cfg->m == old_cfg.m) && (cfg->p == old_cfg.p)) {
+		ret = pll->params->dyn_ramp(pll, cfg);
+		if (!ret)
+			return 0;
+	}
+
 	if (state) {
 		pll_clk_stop_ss(pll);
 		_clk_pll_disable(hw);
 	}
 
+	if (!pll->params->defaults_set && pll->params->set_defaults)
+		pll->params->set_defaults(pll);
+
 	_update_pll_mnp(pll, cfg);
 
 	if (pll->params->flags & TEGRA_PLL_HAS_CPCON)
@@ -1528,6 +1541,9 @@ static struct clk *_tegra_clk_register_pll(struct tegra_clk_pll *pll,
 	if (!pll->params->calc_rate)
 		pll->params->calc_rate = _calc_rate;
 
+	if (pll->params->set_defaults)
+		pll->params->set_defaults(pll);
+
 	/* Data in .init is copied by clk_register(), so stack variable OK */
 	pll->hw.init = &init;
 
@@ -1646,7 +1662,6 @@ struct clk *tegra_clk_register_pllxc(const char *name, const char *parent_name,
 	struct tegra_clk_pll *pll;
 	struct clk *clk, *parent;
 	unsigned long parent_rate;
-	int err;
 	u32 val, val_iddq;
 
 	parent = __clk_lookup(parent_name);
@@ -1667,18 +1682,27 @@ struct clk *tegra_clk_register_pllxc(const char *name, const char *parent_name,
 		pll_params->vco_min = pll_params->adjust_vco(pll_params,
 							     parent_rate);
 
-	err = _setup_dynamic_ramp(pll_params, clk_base, parent_rate);
-	if (err)
-		return ERR_PTR(err);
+	/*
+	 * If the pll has a set_defaults callback, it will take care of
+	 * configuring dynamic ramping and setting IDDQ in that path.
+	 */
+	if (!pll_params->set_defaults) {
+		int err;
 
-	val = readl_relaxed(clk_base + pll_params->base_reg);
-	val_iddq = readl_relaxed(clk_base + pll_params->iddq_reg);
+		err = _setup_dynamic_ramp(pll_params, clk_base, parent_rate);
+		if (err)
+			return ERR_PTR(err);
 
-	if (val & PLL_BASE_ENABLE)
-		WARN_ON(val_iddq & BIT(pll_params->iddq_bit_idx));
-	else {
-		val_iddq |= BIT(pll_params->iddq_bit_idx);
-		writel_relaxed(val_iddq, clk_base + pll_params->iddq_reg);
+		val = readl_relaxed(clk_base + pll_params->base_reg);
+		val_iddq = readl_relaxed(clk_base + pll_params->iddq_reg);
+
+		if (val & PLL_BASE_ENABLE)
+			WARN_ON(val_iddq & BIT(pll_params->iddq_bit_idx));
+		else {
+			val_iddq |= BIT(pll_params->iddq_bit_idx);
+			writel_relaxed(val_iddq,
+				       clk_base + pll_params->iddq_reg);
+		}
 	}
 
 	pll = _tegra_init_pll(clk_base, pmc, pll_params, lock);
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index 850521d42be6..6454c1732dbd 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -239,6 +239,7 @@ struct tegra_clk_pll_params {
 	int		stepb_shift;
 	int		lock_delay;
 	int		max_p;
+	bool		defaults_set;
 	struct pdiv_map *pdiv_tohw;
 	struct div_nmp	*div_nmp;
 	struct tegra_clk_pll_freq_table	*freq_table;
@@ -254,6 +255,7 @@ struct tegra_clk_pll_params {
 				unsigned long parent_rate);
 	int	(*dyn_ramp)(struct tegra_clk_pll *pll,
 			struct tegra_clk_pll_freq_table *cfg);
+	void	(*set_defaults)(struct tegra_clk_pll *pll);
 };
 
 #define TEGRA_PLL_USE_LOCK BIT(0)
@@ -588,6 +590,19 @@ struct tegra_periph_init_data {
 			_clk_num, _gate_flags, _clk_id,\
 			NULL, 0, NULL)
 
+#define PLL_MISC_CHK_DEFAULT(base, params, misc_num, default_val, mask)        \
+do {									       \
+	u32 boot_val = readl_relaxed(base + (params)->ext_misc_reg[misc_num]); \
+	boot_val &= (mask);						       \
+	default_val &= (mask);						       \
+	if (boot_val != (default_val)) {				       \
+		pr_warn("boot misc" #misc_num " 0x%x : expected 0x%x\n",       \
+			boot_val, (default_val));			       \
+		pr_warn(" (comparison mask = 0x%x)\n", mask);		       \
+			(params)->defaults_set = false;			       \
+	}								       \
+} while (0)
+
 /**
  * struct clk_super_mux - super clock
  *
-- 
1.7.9.5