linux-kernel - [PATCH v7 4/9] usb: dwc3: core: Skip setting event buffers for host only controllers

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Message-ID: <20230501143445.3851-5-quic_kriskura@quicinc.com>
Date:   Mon, 1 May 2023 20:04:40 +0530
From:   Krishna Kurapati <quic_kriskura@...cinc.com>
To:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Andy Gross" <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <quic_pkondeti@...cinc.com>, <quic_ppratap@...cinc.com>,
        <quic_jackp@...cinc.com>, <quic_harshq@...cinc.com>,
        <ahalaney@...hat.com>, <quic_shazhuss@...cinc.com>,
        Krishna Kurapati <quic_kriskura@...cinc.com>
Subject: [PATCH v7 4/9] usb: dwc3: core: Skip setting event buffers for host only controllers

On some SoC's like SA8295P where the tertiary controller is host-only
capable, GEVTADDRHI/LO, GEVTSIZ, GEVTCOUNT registers are not accessible.
Trying to setup them up during core_init leads to a crash.

For DRD/Peripheral supported controllers, event buffer setup is done
again in gadget_pullup. Skip setup or cleanup of event buffers if
controller is host-only capable.

Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
---
 drivers/usb/dwc3/core.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index b8ac7bcee391..8625fc5c7ab4 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -835,7 +835,12 @@ static void dwc3_clk_disable(struct dwc3 *dwc)
 
 static void dwc3_core_exit(struct dwc3 *dwc)
 {
-	dwc3_event_buffers_cleanup(dwc);
+	unsigned int	hw_mode;
+
+	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
+	if (hw_mode != DWC3_GHWPARAMS0_MODE_HOST)
+		dwc3_event_buffers_cleanup(dwc);
+
 	dwc3_phy_power_off(dwc);
 	dwc3_phy_exit(dwc);
 	dwc3_clk_disable(dwc);
@@ -1141,10 +1146,12 @@ static int dwc3_core_init(struct dwc3 *dwc)
 	if (ret)
 		goto err_exit_phy;
 
-	ret = dwc3_event_buffers_setup(dwc);
-	if (ret) {
-		dev_err(dwc->dev, "failed to setup event buffers\n");
-		goto err_power_off_phy;
+	if (hw_mode != DWC3_GHWPARAMS0_MODE_HOST) {
+		ret = dwc3_event_buffers_setup(dwc);
+		if (ret) {
+			dev_err(dwc->dev, "failed to setup event buffers\n");
+			goto err_power_off_phy;
+		}
 	}
 
 	/*
@@ -1958,7 +1965,10 @@ static int dwc3_probe(struct platform_device *pdev)
 
 err_exit_debugfs:
 	dwc3_debugfs_exit(dwc);
-	dwc3_event_buffers_cleanup(dwc);
+
+	if (hw_mode != DWC3_GHWPARAMS0_MODE_HOST)
+		dwc3_event_buffers_cleanup(dwc);
+
 	dwc3_phy_power_off(dwc);
 	dwc3_phy_exit(dwc);
 	dwc3_ulpi_exit(dwc);
-- 
2.40.0