Re: [PATCH v19 3/7] soc: mediatek: SVS: introduce MTK SVS engine

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:
[...]

quoted

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 @@

[...]

quoted

+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.

quoted

+		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.

quoted

+		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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