clk: tegra: pll: Add Set_default logic

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.

Based on original work by Aleksandr Frid <afrid@nvidia.com>

Signed-off-by: Bill Huang <bilhuang@nvidia.com>
Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 28 insertions, 11 deletions

diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 66da418c8528..1decca98008f 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -662,13 +662,19 @@ 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)
 		_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)
@@ -1494,6 +1500,9 @@ static struct clk *_tegra_clk_register_pll(struct tegra_clk_pll *pll,
 			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;
 
@@ -1604,7 +1613,6 @@ 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);
@@ -1625,18 +1633,27 @@ 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;
+
+		err = _setup_dynamic_ramp(pll_params, clk_base, parent_rate);
+		if (err)
+			return ERR_PTR(err);
 
-	val = readl_relaxed(clk_base + pll_params->base_reg);
-	val_iddq = readl_relaxed(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);
+		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);