linux-kernel - [PATCH] usb: dwc3: core: Set force_gen1 bit for all applicable SuperSpeed ports

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Message-ID: <20241112182018.199392-1-quic_kriskura@quicinc.com>
Date: Tue, 12 Nov 2024 23:50:18 +0530
From: Krishna Kurapati <quic_kriskura@...cinc.com>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>
CC: <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <quic_ppratap@...cinc.com>, <quic_jackp@...cinc.com>,
        Krishna Kurapati
	<quic_kriskura@...cinc.com>
Subject: [PATCH] usb: dwc3: core: Set force_gen1 bit for all applicable SuperSpeed ports

Currently if the maximum-speed is set to Super Speed for a 3.1 Gen2
capable controller, the FORCE_GEN1 bit of LLUCTL register is set only
for one SuperSpeed port (or the first port) present. Modify the logic
to set the FORCE_GEN1 bit for all ports if speed is being limited to
Gen-1.

Suggested-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
---
Suggestion provided for the same at:
https://lore.kernel.org/all/20230517003037.i7hsg6k5fn4eyvgf@synopsys.com/

This patch has only been compile tested due to unavailability of
hardware at the moment.

 drivers/usb/dwc3/core.c | 10 +++++++---
 drivers/usb/dwc3/core.h |  2 +-
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 9b888d33e64d..67aefdbe1d5f 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1470,9 +1470,13 @@ static int dwc3_core_init(struct dwc3 *dwc)
 	if (hw_mode != DWC3_GHWPARAMS0_MODE_GADGET &&
 	    (DWC3_IP_IS(DWC31)) &&
 	    dwc->maximum_speed == USB_SPEED_SUPER) {
-		reg = dwc3_readl(dwc->regs, DWC3_LLUCTL);
-		reg |= DWC3_LLUCTL_FORCE_GEN1;
-		dwc3_writel(dwc->regs, DWC3_LLUCTL, reg);
+		int i;
+
+		for (i = 0; i < dwc->num_usb3_ports; i++) {
+			reg = dwc3_readl(dwc->regs, DWC3_LLUCTL(i));
+			reg |= DWC3_LLUCTL_FORCE_GEN1;
+			dwc3_writel(dwc->regs, DWC3_LLUCTL(i), reg);
+		}
 	}
 
 	return 0;
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index eaa55c0cf62f..296cbe85a494 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -179,7 +179,7 @@
 #define DWC3_OEVTEN		0xcc0C
 #define DWC3_OSTS		0xcc10
 
-#define DWC3_LLUCTL		0xd024
+#define DWC3_LLUCTL(n)		(0xd024 + ((n) * 0x80))
 
 /* Bit fields */
 
-- 
2.34.1