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Fri, 09 Aug 2019 05:17:26 -0700 (PDT) Subject: Re: [PATCH v8 10/21] clk: tegra: clk-super: Add restore-context support 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> <1565308020-31952-11-git-send-email-skomatineni@nvidia.com> From: Dmitry Osipenko Message-ID: <4e33bad9-8d5a-dcd7-c75e-db5843c9be4a@gmail.com> Date: Fri, 9 Aug 2019 15:17:25 +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: <1565308020-31952-11-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 restore_context for clk_super_mux and clk_super. > > During system supend, core power goes off the and context of Tegra > CAR registers is lost. > > So on system resume, context of super clock registers are restored > to have them in same state as before suspend. > > Signed-off-by: Sowjanya Komatineni > --- > drivers/clk/tegra/clk-super.c | 21 +++++++++++++++++++++ > 1 file changed, 21 insertions(+) > > diff --git a/drivers/clk/tegra/clk-super.c b/drivers/clk/tegra/clk-super.c > index e2a1e95a8db7..74c9e913e41c 100644 > --- a/drivers/clk/tegra/clk-super.c > +++ b/drivers/clk/tegra/clk-super.c > @@ -124,9 +124,18 @@ static int clk_super_set_parent(struct clk_hw *hw, u8 index) > return err; > } > > +static void clk_super_mux_restore_context(struct clk_hw *hw) > +{ > + struct clk_hw *parent = clk_hw_get_parent(hw); > + int parent_id = clk_hw_get_parent_index(hw, parent); > + > + clk_super_set_parent(hw, parent_id); All Super clocks have a divider, including the "MUX". Thus I'm wondering if there is a chance that divider's configuration may differ on resume from what it was on suspend. > +} > + > static const struct clk_ops tegra_clk_super_mux_ops = { > .get_parent = clk_super_get_parent, > .set_parent = clk_super_set_parent, > + .restore_context = clk_super_mux_restore_context, > }; > > static long clk_super_round_rate(struct clk_hw *hw, unsigned long rate, > @@ -162,12 +171,24 @@ static int clk_super_set_rate(struct clk_hw *hw, unsigned long rate, > return super->div_ops->set_rate(div_hw, rate, parent_rate); > } > > +static void clk_super_restore_context(struct clk_hw *hw) > +{ > + struct tegra_clk_super_mux *super = to_clk_super_mux(hw); > + struct clk_hw *div_hw = &super->frac_div.hw; > + struct clk_hw *parent = clk_hw_get_parent(hw); > + int parent_id = clk_hw_get_parent_index(hw, parent); > + > + super->div_ops->restore_context(div_hw); > + clk_super_set_parent(hw, parent_id); > +} > + > const struct clk_ops tegra_clk_super_ops = { > .get_parent = clk_super_get_parent, > .set_parent = clk_super_set_parent, > .set_rate = clk_super_set_rate, > .round_rate = clk_super_round_rate, > .recalc_rate = clk_super_recalc_rate, > + .restore_context = clk_super_restore_context, > }; > > struct clk *tegra_clk_register_super_mux(const char *name, >