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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 21-11-10 13:15:26, Martin Kepplinger wrote: > Am Montag, dem 13.09.2021 um 20:38 +0300 schrieb Abel Vesa: > > Seems that, in order to be able to resume from suspend, the dram rate > > needs to be the highest one available. Therefore, add the late system > > suspend/resume PM ops which set the highest rate on suspend and the > > latest one used before suspending on resume. > = > Hi Abel, wouldn't this mean that s2idle / freeze would be kind of > broken by this? > = Nope. Only the DDR rate needs to be raised at 800M before suspending. Everything else stays the same. > Does is make sense to test the lowest rate? How would I force that > here? (just for testing) You can try, but it will surely freeze. See [1] what you need to change for testing. > = > Also, you could think about splitting this series up a bit and do this > patch seperately onto mainline (before or after the other work). > = Well, I sent as RFC until now. Seems there are no big issues with the approach. So I'll split the patches between subsystems on the next iteration. > thank you > martin > = > = > > = > > Signed-off-by: Abel Vesa > > --- > > =A0drivers/devfreq/imx8m-ddrc.c | 28 +++++++++++++++++++++++++++- > > =A01 file changed, 27 insertions(+), 1 deletion(-) > > = > > diff --git a/drivers/devfreq/imx8m-ddrc.c b/drivers/devfreq/imx8m- > > ddrc.c > > index f18a5c3c1c03..f39741b4a0b0 100644 > > --- a/drivers/devfreq/imx8m-ddrc.c > > +++ b/drivers/devfreq/imx8m-ddrc.c > > @@ -72,6 +72,8 @@ struct imx8m_ddrc { > > =A0=A0=A0=A0=A0=A0=A0=A0struct clk *dram_alt; > > =A0=A0=A0=A0=A0=A0=A0=A0struct clk *dram_apb; > > =A0 > > +=A0=A0=A0=A0=A0=A0=A0unsigned long suspend_rate; > > +=A0=A0=A0=A0=A0=A0=A0unsigned long resume_rate; > > =A0=A0=A0=A0=A0=A0=A0=A0int freq_count; > > =A0=A0=A0=A0=A0=A0=A0=A0struct imx8m_ddrc_freq freq_table[IMX8M_DDRC_MA= X_FREQ_COUNT]; > > =A0}; > > @@ -271,6 +273,22 @@ static int imx8m_ddrc_target(struct device *dev, > > unsigned long *freq, u32 flags) > > =A0=A0=A0=A0=A0=A0=A0=A0return ret; > > =A0} > > =A0 > > +static int imx8m_ddrc_suspend(struct device *dev) > > +{ > > +=A0=A0=A0=A0=A0=A0=A0struct imx8m_ddrc *priv =3D dev_get_drvdata(dev); > > + > > +=A0=A0=A0=A0=A0=A0=A0priv->resume_rate =3D clk_get_rate(priv->dram_cor= e); > > + > > +=A0=A0=A0=A0=A0=A0=A0return imx8m_ddrc_target(dev, &priv->suspend_rate= , 0); > > +} > > + > > +static int imx8m_ddrc_resume(struct device *dev) > > +{ > > +=A0=A0=A0=A0=A0=A0=A0struct imx8m_ddrc *priv =3D dev_get_drvdata(dev); > > + > > +=A0=A0=A0=A0=A0=A0=A0return imx8m_ddrc_target(dev, &priv->resume_rate,= 0); > > +} > > + > > =A0static int imx8m_ddrc_get_cur_freq(struct device *dev, unsigned long > > *freq) > > =A0{ > > =A0=A0=A0=A0=A0=A0=A0=A0struct imx8m_ddrc *priv =3D dev_get_drvdata(dev= ); > > @@ -324,6 +342,9 @@ static int imx8m_ddrc_init_freq_info(struct > > device *dev) > > =A0 > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0if (dev_pm_opp_add(dev,= freq->rate * 250000, 0)) > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0return -ENODEV; > > + > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0if (index =3D=3D=A0 0) [1] Change this line to: if (index =3D=3D 1) It will select the 166935483 freq for suspending. > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0p= riv->suspend_rate =3D freq->rate * 250000; > > =A0=A0=A0=A0=A0=A0=A0=A0} > > =A0 > > =A0=A0=A0=A0=A0=A0=A0=A0return 0; > > @@ -399,11 +420,16 @@ static const struct of_device_id > > imx8m_ddrc_of_match[] =3D { > > =A0}; > > =A0MODULE_DEVICE_TABLE(of, imx8m_ddrc_of_match); > > =A0 > > +static const struct dev_pm_ops imx8m_ddrc_pm_ops =3D { > > +=A0=A0=A0=A0=A0=A0=A0SET_LATE_SYSTEM_SLEEP_PM_OPS(imx8m_ddrc_suspend, > > imx8m_ddrc_resume) > > +}; > > + > > =A0static struct platform_driver imx8m_ddrc_platdrv =3D { > > =A0=A0=A0=A0=A0=A0=A0=A0.probe=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=3D imx8m_d= drc_probe, > > =A0=A0=A0=A0=A0=A0=A0=A0.driver =3D { > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0.name=A0=A0=A0=3D "imx8= m-ddrc-devfreq", > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0.of_match_table =3D imx8m= _ddrc_of_match, > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0.pm =3D &imx8m_ddrc_pm_op= s, > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0.of_match_table =3D of_ma= tch_ptr(imx8m_ddrc_of_match), > > =A0=A0=A0=A0=A0=A0=A0=A0}, > > =A0}; > > =A0module_platform_driver(imx8m_ddrc_platdrv); > = > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel