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Fri, 09 Aug 2019 05:46:06 -0700 (PDT) Subject: Re: [PATCH v8 05/21] clk: tegra: pll: Save and restore pll context To: Sowjanya Komatineni , thierry.reding@gmail.com, jonathanh@nvidia.com, tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com, linus.walleij@linaro.org, stefan@agner.ch, mark.rutland@arm.com Cc: pdeschrijver@nvidia.com, pgaikwad@nvidia.com, sboyd@kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, jckuo@nvidia.com, josephl@nvidia.com, talho@nvidia.com, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, mperttunen@nvidia.com, spatra@nvidia.com, robh+dt@kernel.org, devicetree@vger.kernel.org, rjw@rjwysocki.net, viresh.kumar@linaro.org, linux-pm@vger.kernel.org References: <1565308020-31952-1-git-send-email-skomatineni@nvidia.com> <1565308020-31952-6-git-send-email-skomatineni@nvidia.com> From: Dmitry Osipenko Message-ID: <3e5867db-2675-a701-948b-1436f9d5dcd9@gmail.com> Date: Fri, 9 Aug 2019 15:46:04 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <1565308020-31952-6-git-send-email-skomatineni@nvidia.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org 09.08.2019 2:46, Sowjanya Komatineni пишет: > This patch implements save and restore of PLL context. > > During system suspend, core power goes off and looses the settings > of the Tegra CAR controller registers. > > So during suspend entry pll context is stored and on resume it is > restored back along with its state. > > Acked-by: Thierry Reding > Signed-off-by: Sowjanya Komatineni > --- > drivers/clk/tegra/clk-pll.c | 88 ++++++++++++++++++++++++++++----------------- > drivers/clk/tegra/clk.h | 2 ++ > 2 files changed, 58 insertions(+), 32 deletions(-) > > diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c > index 1583f5fc992f..e52add2bbdbb 100644 > --- a/drivers/clk/tegra/clk-pll.c > +++ b/drivers/clk/tegra/clk-pll.c > @@ -1008,6 +1008,28 @@ static unsigned long clk_plle_recalc_rate(struct clk_hw *hw, > return rate; > } > > +static void tegra_clk_pll_restore_context(struct clk_hw *hw) > +{ > + struct tegra_clk_pll *pll = to_clk_pll(hw); > + struct clk_hw *parent = clk_hw_get_parent(hw); > + unsigned long parent_rate = clk_hw_get_rate(parent); > + unsigned long rate = clk_hw_get_rate(hw); > + u32 val; > + > + if (clk_pll_is_enabled(hw)) > + return; > + > + if (pll->params->set_defaults) > + pll->params->set_defaults(pll); > + > + clk_pll_set_rate(hw, rate, parent_rate); > + > + if (!__clk_get_enable_count(hw->clk)) > + clk_pll_disable(hw); > + else > + clk_pll_enable(hw); > +} drivers/clk/tegra/clk-pll.c: In function ‘tegra_clk_pll_restore_context’: drivers/clk/tegra/clk-pll.c:1024:6: warning: unused variable ‘val’ [-Wunused-variable] 1024 | u32 val;