Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Sebastian Reichel <sebastian.reichel@collabora.com>
To:     Heiko Stuebner <heiko@sntech.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        linux-rockchip@lists.infradead.org, linux-usb@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        Sebastian Reichel <sebastian.reichel@collabora.com>,
        kernel@collabora.com
Subject: [PATCH v2 2/3] usb: dwc3: add optional PHY interface clocks
Date:   Thu, 20 Jul 2023 19:36:42 +0200
Message-Id: <20230720173643.69553-3-sebastian.reichel@collabora.com>
In-Reply-To: <20230720173643.69553-1-sebastian.reichel@collabora.com>
References: <20230720173643.69553-1-sebastian.reichel@collabora.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

On Rockchip RK3588 one of the DWC3 cores is integrated weirdly and
requires two extra clocks to be enabled. Without these extra clocks
hot-plugging USB devices is broken.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/usb/dwc3/core.c | 26 ++++++++++++++++++++++++++
 drivers/usb/dwc3/core.h |  4 ++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index f6689b731718..0618fcc4d0af 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -817,8 +817,20 @@ static int dwc3_clk_enable(struct dwc3 *dwc)
 	if (ret)
 		goto disable_ref_clk;
 
+	ret = clk_prepare_enable(dwc->utmi_clk);
+	if (ret)
+		goto disable_susp_clk;
+
+	ret = clk_prepare_enable(dwc->pipe_clk);
+	if (ret)
+		goto disable_utmi_clk;
+
 	return 0;
 
+disable_utmi_clk:
+	clk_disable_unprepare(dwc->utmi_clk);
+disable_susp_clk:
+	clk_disable_unprepare(dwc->susp_clk);
 disable_ref_clk:
 	clk_disable_unprepare(dwc->ref_clk);
 disable_bus_clk:
@@ -828,6 +840,8 @@ static int dwc3_clk_enable(struct dwc3 *dwc)
 
 static void dwc3_clk_disable(struct dwc3 *dwc)
 {
+	clk_disable_unprepare(dwc->pipe_clk);
+	clk_disable_unprepare(dwc->utmi_clk);
 	clk_disable_unprepare(dwc->susp_clk);
 	clk_disable_unprepare(dwc->ref_clk);
 	clk_disable_unprepare(dwc->bus_clk);
@@ -1764,6 +1778,18 @@ static int dwc3_get_clocks(struct dwc3 *dwc)
 		}
 	}
 
+	dwc->utmi_clk = devm_clk_get_optional(dev, "utmi");
+	if (IS_ERR(dwc->utmi_clk)) {
+		return dev_err_probe(dev, PTR_ERR(dwc->utmi_clk),
+				"could not get utmi clock\n");
+	}
+
+	dwc->pipe_clk = devm_clk_get_optional(dev, "pipe");
+	if (IS_ERR(dwc->pipe_clk)) {
+		return dev_err_probe(dev, PTR_ERR(dwc->pipe_clk),
+				"could not get pipe clock\n");
+	}
+
 	return 0;
 }
 
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 8b1295e4dcdd..fa49a87025cf 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -994,6 +994,8 @@ struct dwc3_scratchpad_array {
  * @bus_clk: clock for accessing the registers
  * @ref_clk: reference clock
  * @susp_clk: clock used when the SS phy is in low power (S3) state
+ * @utmi_clk: clock used for USB2 PHY communication
+ * @pipe_clk: clock used for USB3 PHY communication
  * @reset: reset control
  * @regs: base address for our registers
  * @regs_size: address space size
@@ -1159,6 +1161,8 @@ struct dwc3 {
 	struct clk		*bus_clk;
 	struct clk		*ref_clk;
 	struct clk		*susp_clk;
+	struct clk		*utmi_clk;
+	struct clk		*pipe_clk;
 
 	struct reset_control	*reset;
 
-- 
2.40.1