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From:   Akhil P Oommen <quic_akhilpo@quicinc.com>
To:     freedreno <freedreno@lists.freedesktop.org>,
        <dri-devel@lists.freedesktop.org>, <linux-arm-msm@vger.kernel.org>,
        Rob Clark <robdclark@gmail.com>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        "Stephen Boyd" <swboyd@chromium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
CC:     Douglas Anderson <dianders@chromium.org>,
        <krzysztof.kozlowski@linaro.org>,
        Akhil P Oommen <quic_akhilpo@quicinc.com>,
        Andy Gross <agross@kernel.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>, <linux-clk@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH v2 3/5] clk: qcom: gdsc: Add a reset op to poll gdsc collapse
Date:   Wed, 17 Aug 2022 20:27:52 +0530
Message-ID: <20220817202609.v2.3.I162c4be55f230cd439f0643f1624527bdc8a9831@changeid>
In-Reply-To: <1660748274-39239-1-git-send-email-quic_akhilpo@quicinc.com>
References: <1660748274-39239-1-git-send-email-quic_akhilpo@quicinc.com>
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Add a reset op compatible function to poll for gdsc collapse.

Signed-off-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
---

Changes in v2:
- Minor update to function prototype

 drivers/clk/qcom/gdsc.c | 23 +++++++++++++++++++----
 drivers/clk/qcom/gdsc.h |  7 +++++++
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index 44520ef..2d0f1d1 100644
--- a/drivers/clk/qcom/gdsc.c
+++ b/drivers/clk/qcom/gdsc.c
@@ -17,6 +17,7 @@
 #include <linux/reset-controller.h>
 #include <linux/slab.h>
 #include "gdsc.h"
+#include "reset.h"
 
 #define PWR_ON_MASK		BIT(31)
 #define EN_REST_WAIT_MASK	GENMASK_ULL(23, 20)
@@ -116,7 +117,8 @@ static int gdsc_hwctrl(struct gdsc *sc, bool en)
 	return regmap_update_bits(sc->regmap, sc->gdscr, HW_CONTROL_MASK, val);
 }
 
-static int gdsc_poll_status(struct gdsc *sc, enum gdsc_status status)
+static int gdsc_poll_status(struct gdsc *sc, enum gdsc_status status,
+		s64 timeout_us, unsigned int interval_ms)
 {
 	ktime_t start;
 
@@ -124,7 +126,9 @@ static int gdsc_poll_status(struct gdsc *sc, enum gdsc_status status)
 	do {
 		if (gdsc_check_status(sc, status))
 			return 0;
-	} while (ktime_us_delta(ktime_get(), start) < TIMEOUT_US);
+		if (interval_ms)
+			msleep(interval_ms);
+	} while (ktime_us_delta(ktime_get(), start) < timeout_us);
 
 	if (gdsc_check_status(sc, status))
 		return 0;
@@ -172,7 +176,7 @@ static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status)
 		udelay(1);
 	}
 
-	ret = gdsc_poll_status(sc, status);
+	ret = gdsc_poll_status(sc, status, TIMEOUT_US, 0);
 	WARN(ret, "%s status stuck at 'o%s'", sc->pd.name, status ? "ff" : "n");
 
 	if (!ret && status == GDSC_OFF && sc->rsupply) {
@@ -343,7 +347,7 @@ static int _gdsc_disable(struct gdsc *sc)
 		 */
 		udelay(1);
 
-		ret = gdsc_poll_status(sc, GDSC_ON);
+		ret = gdsc_poll_status(sc, GDSC_ON, TIMEOUT_US, 0);
 		if (ret)
 			return ret;
 	}
@@ -565,3 +569,14 @@ int gdsc_gx_do_nothing_enable(struct generic_pm_domain *domain)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(gdsc_gx_do_nothing_enable);
+
+int gdsc_wait_for_collapse(void *priv)
+{
+	struct gdsc *sc = priv;
+	int ret;
+
+	ret = gdsc_poll_status(sc, GDSC_OFF, 500000, 5);
+	WARN(ret, "%s status stuck at 'on'", sc->pd.name);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gdsc_wait_for_collapse);
diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h
index ad313d7..d484bdb 100644
--- a/drivers/clk/qcom/gdsc.h
+++ b/drivers/clk/qcom/gdsc.h
@@ -12,6 +12,7 @@
 struct regmap;
 struct regulator;
 struct reset_controller_dev;
+struct qcom_reset_map;
 
 /**
  * struct gdsc - Globally Distributed Switch Controller
@@ -79,6 +80,7 @@ int gdsc_register(struct gdsc_desc *desc, struct reset_controller_dev *,
 		  struct regmap *);
 void gdsc_unregister(struct gdsc_desc *desc);
 int gdsc_gx_do_nothing_enable(struct generic_pm_domain *domain);
+int gdsc_wait_for_collapse(void *priv);
 #else
 static inline int gdsc_register(struct gdsc_desc *desc,
 				struct reset_controller_dev *rcdev,
@@ -88,5 +90,10 @@ static inline int gdsc_register(struct gdsc_desc *desc,
 }
 
 static inline void gdsc_unregister(struct gdsc_desc *desc) {};
+
+static int gdsc_wait_for_collapse(void *priv)
+{
+	return  -ENOSYS;
+}
 #endif /* CONFIG_QCOM_GDSC */
 #endif /* __QCOM_GDSC_H__ */
-- 
2.7.4