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Date: Thu, 18 Jun 2015 17:28:27 -0400
From: Rhyland Klein <rklein@...dia.com>
To: Peter De Schrijver <pdeschrijver@...dia.com>,
Thierry Reding <thierry.reding@...il.com>
CC: Mike Turquette <mturquette@...aro.org>,
Stephen Warren <swarren@...dotorg.org>,
Stephen Boyd <sboyd@...eaurora.org>,
Alexandre Courbot <gnurou@...il.com>,
Bill Huang <bilhuang@...dia.com>, Jim Lin <jilin@...dia.com>,
Benson Leung <bleung@...omium.org>, linux-clk@...r.kernel.org,
linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
Danny Huang <dahuang@...dia.com>,
Rhyland Klein <rklein@...dia.com>
Subject: [PATCH v6 12/25] clk: tegra: Update PLLM handling
From: Danny Huang <dahuang@...dia.com>
PLLM is fixed for Tegra30 up through Tegra114. Starting with Tegra124
PLLM can change rate. Mark PLLM as TEGRA_PLL_FIXED for the generations
where it should be. Modify the check in clk_pll_round_rate and
clk_pll_recalc_rate to allow for the non-fixed version to
return the correct rate.
Note that clk-tegra20 is not touched. This is because PLL_M is not
distinguished in that driver, and adding either the PLL_M or FIXED_RATE
flags will cause potential problems.
PLLM never supported dynamic ramping. On T20/T30, there is no dynamic
ramping al all, and on T114/T124/T132, only PLLX and PLLC support
dynamic ramping, so we can go ahead and remove the specialized pllm_ops.
Signed-off-by: Danny Huang <dahuang@...dia.com>
Signed-off-by: Rhyland Klein <rklein@...dia.com>
---
drivers/clk/tegra/clk-pll.c | 56 +++++---------------------------------
drivers/clk/tegra/clk-tegra114.c | 3 +-
drivers/clk/tegra/clk-tegra30.c | 2 +-
3 files changed, 10 insertions(+), 51 deletions(-)
diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 54ebab2b85e5..ff67f6d77ca9 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -717,12 +717,12 @@ static long clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
struct tegra_clk_pll *pll = to_clk_pll(hw);
struct tegra_clk_pll_freq_table cfg;
- if (pll->params->flags & TEGRA_PLL_FIXED)
+ if (pll->params->flags & TEGRA_PLL_FIXED) {
+ /* 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);
return pll->params->fixed_rate;
-
- /* PLLM is used for memory; we do not change rate */
- if (pll->params->flags & TEGRA_PLLM)
- return __clk_get_rate(hw->clk);
+ }
if (_get_table_rate(hw, &cfg, rate, *prate) &&
pll->params->calc_rate(hw, &cfg, rate, *prate))
@@ -746,6 +746,7 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
return parent_rate;
if ((pll->params->flags & TEGRA_PLL_FIXED) &&
+ !(pll->params->flags & (TEGRA_PLLM | TEGRA_PLLMB)) &&
!(val & PLL_BASE_OVERRIDE)) {
struct tegra_clk_pll_freq_table sel;
if (_get_table_rate(hw, &sel, pll->params->fixed_rate,
@@ -1088,40 +1089,6 @@ static long clk_pll_ramp_round_rate(struct clk_hw *hw, unsigned long rate,
return output_rate;
}
-static int clk_pllm_set_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long parent_rate)
-{
- struct tegra_clk_pll_freq_table cfg;
- struct tegra_clk_pll *pll = to_clk_pll(hw);
- unsigned long flags = 0;
- int state, ret = 0;
-
- if (pll->lock)
- spin_lock_irqsave(pll->lock, flags);
-
- state = clk_pll_is_enabled(hw);
- if (state) {
- if (rate != clk_get_rate(hw->clk)) {
- pr_err("%s: Cannot change active PLLM\n", __func__);
- ret = -EINVAL;
- goto out;
- }
- goto out;
- }
-
- ret = _pll_ramp_calc_pll(hw, &cfg, rate, parent_rate);
- if (ret < 0)
- goto out;
-
- _update_pll_mnp(pll, &cfg);
-
-out:
- if (pll->lock)
- spin_unlock_irqrestore(pll->lock, flags);
-
- return ret;
-}
-
static void _pllcx_strobe(struct tegra_clk_pll *pll)
{
u32 val;
@@ -1589,15 +1556,6 @@ static const struct clk_ops tegra_clk_pllxc_ops = {
.set_rate = clk_pllxc_set_rate,
};
-static const struct clk_ops tegra_clk_pllm_ops = {
- .is_enabled = clk_pll_is_enabled,
- .enable = clk_pll_enable,
- .disable = clk_pll_disable,
- .recalc_rate = clk_pll_recalc_rate,
- .round_rate = clk_pll_ramp_round_rate,
- .set_rate = clk_pllm_set_rate,
-};
-
static const struct clk_ops tegra_clk_pllc_ops = {
.is_enabled = clk_pll_is_enabled,
.enable = clk_pllc_enable,
@@ -1751,7 +1709,7 @@ struct clk *tegra_clk_register_pllm(const char *name, const char *parent_name,
return ERR_CAST(pll);
clk = _tegra_clk_register_pll(pll, name, parent_name, flags,
- &tegra_clk_pllm_ops);
+ &tegra_clk_pll_ops);
if (IS_ERR(clk))
kfree(pll);
diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c
index 2e8ed12a6889..7cbb63175896 100644
--- a/drivers/clk/tegra/clk-tegra114.c
+++ b/drivers/clk/tegra/clk-tegra114.c
@@ -353,7 +353,8 @@ static struct tegra_clk_pll_params pll_m_params = {
.pmc_divnm_reg = PMC_PLLM_WB0_OVERRIDE,
.pmc_divp_reg = PMC_PLLM_WB0_OVERRIDE_2,
.freq_table = pll_m_freq_table,
- .flags = TEGRA_PLL_USE_LOCK | TEGRA_PLL_HAS_LOCK_ENABLE,
+ .flags = TEGRA_PLL_USE_LOCK | TEGRA_PLL_HAS_LOCK_ENABLE |
+ TEGRA_PLL_FIXED,
};
static struct div_nmp pllp_nmp = {
diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
index 115ce6e18218..eadef0b802e4 100644
--- a/drivers/clk/tegra/clk-tegra30.c
+++ b/drivers/clk/tegra/clk-tegra30.c
@@ -457,7 +457,7 @@ static struct tegra_clk_pll_params pll_m_params = {
.freq_table = pll_m_freq_table,
.flags = TEGRA_PLLM | TEGRA_PLL_HAS_CPCON |
TEGRA_PLL_SET_DCCON | TEGRA_PLL_USE_LOCK |
- TEGRA_PLL_HAS_LOCK_ENABLE,
+ TEGRA_PLL_HAS_LOCK_ENABLE | TEGRA_PLL_FIXED,
};
static struct tegra_clk_pll_params pll_p_params = {
--
1.7.9.5
--
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