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SubjectRe: [PATCH v19 3/7] soc: mediatek: SVS: introduce MTK SVS engine
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Hi Philipp,

Thanks for the advice.

On Fri, 2021-07-02 at 10:33 +0200, Philipp Zabel wrote:
> Hi Roger,
>
> On Fri, 2021-07-02 at 11:12 +0800, Roger Lu wrote:
> [...]
> > diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
> > new file mode 100644
> > index 000000000000..c2fcbc204b1d
> > --- /dev/null
> > +++ b/drivers/soc/mediatek/mtk-svs.c
> > @@ -0,0 +1,1724 @@
>
> [...]
> > +static int svs_suspend(struct device *dev)
> > +{
> > + struct svs_platform *svsp = dev_get_drvdata(dev);
> > + struct svs_bank *svsb;
> > + unsigned long flags;
> > + int ret;
> > + u32 idx;
> > +
> > + for (idx = 0; idx < svsp->bank_num; idx++) {
> > + svsb = &svsp->banks[idx];
> > +
> > + /* Wait if svs_isr() is still in process. */
> > + spin_lock_irqsave(&mtk_svs_lock, flags);
> > + svsp->pbank = svsb;
> > + svs_switch_bank(svsp);
> > + svs_writel(svsp, SVSB_EN_OFF, SVSEN);
> > + svs_writel(svsp, SVSB_INTSTS_CLEAN, INTSTS);
> > + spin_unlock_irqrestore(&mtk_svs_lock, flags);
> > +
> > + svsb->suspended = true;
> > + if (svsb->phase != SVSB_PHASE_INIT01) {
> > + svsb->phase = SVSB_PHASE_ERROR;
> > + svs_adjust_pm_opp_volts(svsb, true);
> > + }
> > + }
> > +
> > + if (svsp->rst) {
>
> This is not necessary, reset_control_assert() checks for (rstc == NULL)
> itself.
Okay. We'll remove "if (svsp->rst) {" in the next patch. Thanks.

>
> > + ret = reset_control_assert(svsp->rst);
> > + if (ret) {
> > + dev_err(svsp->dev, "cannot assert reset %d\n", ret);
> > + return ret;
> > + }
> > + }
> > +
> > + clk_disable_unprepare(svsp->main_clk);
> > +
> > + return 0;
> > +}
> > +
> > +static int svs_resume(struct device *dev)
> > +{
> > + struct svs_platform *svsp = dev_get_drvdata(dev);
> > + struct svs_bank *svsb;
> > + int ret;
> > + u32 idx;
> > +
> > + ret = clk_prepare_enable(svsp->main_clk);
> > + if (ret) {
> > + dev_err(svsp->dev, "cannot enable main_clk, disable svs\n");
> > + return ret;
> > + }
> > +
> > + if (svsp->rst) {
>
> Same as above, reset_control_deassert(NULL) will just return 0.
Okay. We'll remove "if (svsp->rst) {" in the next patch. Thanks.
>
> > + ret = reset_control_deassert(svsp->rst);
> > + if (ret) {
> > + dev_err(svsp->dev, "cannot deassert reset %d\n", ret);
> > + return ret;
> > + }
> > + }
> > +
> > + for (idx = 0; idx < svsp->bank_num; idx++) {
> > + svsb = &svsp->banks[idx];
> > + svsb->suspended = false;
> > + }
> > +
> > + ret = svs_init02(svsp);
> > + if (ret)
> > + return ret;
> > +
> > + svs_mon_mode(svsp);
> > +
> > + return 0;
> > +}
>
> regards
> Philipp
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