From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Peter De Schrijver <pdeschrijver@nvidia.com>,
Prashant Gaikwad <pgaikwad@nvidia.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>, Peter Geis <pgwipeout@gmail.com>,
Nicolas Chauvet <kwizart@gmail.com>,
Marcel Ziswiler <marcel.ziswiler@toradex.com>
Cc: linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org,
devicetree@vger.kernel.org, linux-clk@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 02/17] clk: tegra: pll: Add pre/post rate-change hooks
Date: Fri, 25 Oct 2019 01:14:01 +0300 [thread overview]
Message-ID: <20191024221416.14197-3-digetx@gmail.com> (raw)
In-Reply-To: <20191024221416.14197-1-digetx@gmail.com>
There is a need to temporarily re-parent CCLK away from PLLX if PLLX's
rate is about to change. The newly introduced PLL pre/post rate-change
hooks allow to handle such case.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/clk/tegra/clk-pll.c | 12 +++++++++++-
drivers/clk/tegra/clk.h | 6 ++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 1583f5fc992f..859340ad3515 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -744,13 +744,19 @@ static int _program_pll(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
state = clk_pll_is_enabled(hw);
+ if (state && pll->params->pre_rate_change) {
+ ret = pll->params->pre_rate_change();
+ if (WARN_ON(ret))
+ return ret;
+ }
+
_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;
+ goto done;
}
if (state) {
@@ -772,6 +778,10 @@ static int _program_pll(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
pll_clk_start_ss(pll);
}
+done:
+ if (state && pll->params->post_rate_change)
+ pll->params->post_rate_change();
+
return ret;
}
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index 095595a5b8a8..2be38aa2c204 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -211,6 +211,10 @@ struct tegra_clk_pll;
* disabled.
* @dyn_ramp: Callback which can be used to define a custom
* dynamic ramp function for a given PLL.
+ * @pre_rate_change: Callback which is invoked just before changing
+ * PLL's rate.
+ * @post_rate_change: Callback which is invoked right after changing
+ * PLL's rate.
*
* Flags:
* TEGRA_PLL_USE_LOCK - This flag indicated to use lock bits for
@@ -287,6 +291,8 @@ struct tegra_clk_pll_params {
void (*set_defaults)(struct tegra_clk_pll *pll);
int (*dyn_ramp)(struct tegra_clk_pll *pll,
struct tegra_clk_pll_freq_table *cfg);
+ int (*pre_rate_change)(void);
+ void (*post_rate_change)(void);
};
#define TEGRA_PLL_USE_LOCK BIT(0)
--
2.23.0
next prev parent reply other threads:[~2019-10-24 22:18 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-24 22:13 [PATCH v2 00/17] NVIDIA Tegra20 CPUFreq driver major update Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 01/17] clk: tegra: Add custom CCLK implementation Dmitry Osipenko
2019-10-24 22:14 ` Dmitry Osipenko [this message]
2019-10-24 22:14 ` [PATCH v2 03/17] clk: tegra: cclk: Add helpers for handling PLLX rate changes Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 04/17] clk: tegra20: Support custom CCLK implementation Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 05/17] clk: tegra30: " Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 06/17] dt-bindings: cpufreq: Add binding for NVIDIA Tegra20/30 Dmitry Osipenko
2019-10-29 21:42 ` Rob Herring
2019-10-30 21:05 ` Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 07/17] cpufreq: tegra20: Use generic cpufreq-dt driver (Tegra30 supported now) Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 08/17] ARM: tegra: Create tegra20-cpufreq platform device on Tegra30 Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 09/17] ARM: dts: tegra20: Add CPU clock Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 10/17] ARM: dts: tegra30: " Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 11/17] ARM: dts: tegra20: Add CPU Operating Performance Points Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 12/17] ARM: dts: tegra30: " Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 13/17] ARM: dts: tegra20: paz00: Set up voltage regulators for DVFS Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 14/17] ARM: dts: tegra20: paz00: Add CPU Operating Performance Points Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 15/17] ARM: dts: tegra20: trimslice: " Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 16/17] ARM: dts: tegra30: cardhu-a04: Set up voltage regulators for DVFS Dmitry Osipenko
2019-10-24 22:14 ` [PATCH v2 17/17] ARM: dts: tegra30: cardhu-a04: Add CPU Operating Performance Points Dmitry Osipenko
2019-11-13 6:52 ` Jon Hunter
2019-11-13 13:57 ` Dmitry Osipenko
2019-11-15 12:52 ` Jon Hunter
2019-11-15 14:55 ` Dmitry Osipenko
2019-11-15 17:31 ` Jon Hunter
2019-11-15 20:35 ` Dmitry Osipenko
2019-11-18 9:52 ` Jon Hunter
2019-10-29 14:09 ` [PATCH v2 00/17] NVIDIA Tegra20 CPUFreq driver major update Thierry Reding
2019-10-29 14:41 ` Dmitry Osipenko
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