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[91.78.220.99]) by smtp.googlemail.com with ESMTPSA id m17sm11607940lfj.22.2019.07.31.03.50.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 31 Jul 2019 03:50:01 -0700 (PDT) Subject: Re: [PATCH v7 03/20] clk: tegra: divider: Save and restore divider rate 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 References: <1564532424-10449-1-git-send-email-skomatineni@nvidia.com> <1564532424-10449-4-git-send-email-skomatineni@nvidia.com> From: Dmitry Osipenko Message-ID: <36a7f0a2-89d3-4f7b-7521-eefc61cbfcef@gmail.com> Date: Wed, 31 Jul 2019 13:49:04 +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: <1564532424-10449-4-git-send-email-skomatineni@nvidia.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 31.07.2019 3:20, Sowjanya Komatineni пишет: > This patch implements context restore for clock divider. > > During system suspend, core power goes off and looses the settings > of the Tegra CAR controller registers. > > So on resume, clock dividers are restored back for normal operation. > > Signed-off-by: Sowjanya Komatineni > --- > drivers/clk/tegra/clk-divider.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/drivers/clk/tegra/clk-divider.c b/drivers/clk/tegra/clk-divider.c > index e76731fb7d69..ca0de5f11f84 100644 > --- a/drivers/clk/tegra/clk-divider.c > +++ b/drivers/clk/tegra/clk-divider.c > @@ -109,10 +109,21 @@ static int clk_frac_div_set_rate(struct clk_hw *hw, unsigned long rate, > return 0; > } > > +static void clk_divider_restore_context(struct clk_hw *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); > + > + if (clk_frac_div_set_rate(hw, rate, parent_rate) < 0) > + WARN_ON(1); > +} > + > const struct clk_ops tegra_clk_frac_div_ops = { > .recalc_rate = clk_frac_div_recalc_rate, > .set_rate = clk_frac_div_set_rate, > .round_rate = clk_frac_div_round_rate, > + .restore_context = clk_divider_restore_context, > }; > > struct clk *tegra_clk_register_divider(const char *name, > Reviewed-by: Dmitry Osipenko