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From:   Amelie Delaunay <amelie.delaunay@foss.st.com>
To:     Kishon Vijay Abraham I <kishon@ti.com>,
        Vinod Koul <vkoul@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>
CC:     <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        Amelie Delaunay <amelie.delaunay@foss.st.com>
Subject: [PATCH v2 4/6] phy: stm32: ensure pll is disabled before phys creation
Date:   Tue, 5 Jan 2021 10:05:23 +0100
Message-ID: <20210105090525.23164-5-amelie.delaunay@foss.st.com>
In-Reply-To: <20210105090525.23164-1-amelie.delaunay@foss.st.com>
References: <20210105090525.23164-1-amelie.delaunay@foss.st.com>
MIME-Version: 1.0
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To ensure a good balancing of regulators, force PLL disable either by
reset or by clearing the PLLEN bit.
If waiting the powerdown pulse delay isn't enough, return -EPROBE_DEFER
instead of polling the PLLEN bit, which will be low at the next probe.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
---
 drivers/phy/st/phy-stm32-usbphyc.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/st/phy-stm32-usbphyc.c b/drivers/phy/st/phy-stm32-usbphyc.c
index 8ef97c8806ff..33367a325612 100644
--- a/drivers/phy/st/phy-stm32-usbphyc.c
+++ b/drivers/phy/st/phy-stm32-usbphyc.c
@@ -8,7 +8,7 @@
 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
-#include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_platform.h>
@@ -334,7 +334,7 @@ static int stm32_usbphyc_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *child, *np = dev->of_node;
 	struct phy_provider *phy_provider;
-	u32 version;
+	u32 pllen, version;
 	int ret, port = 0;
 
 	usbphyc = devm_kzalloc(dev, sizeof(*usbphyc), GFP_KERNEL);
@@ -366,6 +366,19 @@ static int stm32_usbphyc_probe(struct platform_device *pdev)
 		ret = PTR_ERR(usbphyc->rst);
 		if (ret == -EPROBE_DEFER)
 			goto clk_disable;
+
+		stm32_usbphyc_clr_bits(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);
+	}
+
+	/*
+	 * Wait for minimum width of powerdown pulse (ENABLE = Low):
+	 * we have to ensure the PLL is disabled before phys initialization.
+	 */
+	if (readl_relaxed_poll_timeout(usbphyc->base + STM32_USBPHYC_PLL,
+				       pllen, !(pllen & PLLEN), 5, 50)) {
+		dev_warn(usbphyc->dev, "PLL not reset\n");
+		ret = -EPROBE_DEFER;
+		goto clk_disable;
 	}
 
 	usbphyc->switch_setup = -EINVAL;
-- 
2.17.1