linux-kernel - [PATCH v2 2/5] usb: dwc3: Support quirk for writing high-low order

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Message-Id: <1717135657-120818-3-git-send-email-dh10.jung@samsung.com>
Date: Fri, 31 May 2024 15:07:34 +0900
From: Daehwan Jung <dh10.jung@...sung.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>, Thinh Nguyen <Thinh.Nguyen@...opsys.com>, Mathias
	Nyman <mathias.nyman@...el.com>, Felipe Balbi <balbi@...nel.org>
Cc: linux-usb@...r.kernel.org (open list:USB SUBSYSTEM),
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE
	TREE BINDINGS), linux-kernel@...r.kernel.org (open list), Daehwan Jung
	<dh10.jung@...sung.com>
Subject: [PATCH v2 2/5] usb: dwc3: Support quirk for writing high-low order

Set xhci "write-64-hi-lo-quirk" property via
"snps,xhci-write-64-hi-lo-quirk" property.

Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
---
 drivers/usb/dwc3/core.c | 3 +++
 drivers/usb/dwc3/core.h | 2 ++
 drivers/usb/dwc3/host.c | 5 ++++-
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 7ee61a8..89985fd 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1716,6 +1716,9 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	dwc->dis_split_quirk = device_property_read_bool(dev,
 				"snps,dis-split-quirk");
 
+	dwc->xhci_write_64_hi_lo_quirk = device_property_read_bool(dev,
+				"snps,xhci-write-64-hi-lo-quirk");
+
 	dwc->lpm_nyet_threshold = lpm_nyet_threshold;
 	dwc->tx_de_emphasis = tx_de_emphasis;
 
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 3781c73..ab5913c 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1142,6 +1142,7 @@ struct dwc3_scratchpad_array {
  *	3	- Reserved
  * @dis_metastability_quirk: set to disable metastability quirk.
  * @dis_split_quirk: set to disable split boundary.
+ * @xhci_write_64_hi_lo_quirk: set if we enable quirk for writing in high-low order.
  * @sys_wakeup: set if the device may do system wakeup.
  * @wakeup_configured: set if the device is configured for remote wakeup.
  * @suspended: set to track suspend event due to U3/L2.
@@ -1369,6 +1370,7 @@ struct dwc3 {
 	unsigned		dis_metastability_quirk:1;
 
 	unsigned		dis_split_quirk:1;
+	unsigned		xhci_write_64_hi_lo_quirk:1;
 	unsigned		async_callbacks:1;
 	unsigned		sys_wakeup:1;
 	unsigned		wakeup_configured:1;
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index a171b27..8cc0def 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -126,7 +126,7 @@ static int dwc3_host_get_irq(struct dwc3 *dwc)
 
 int dwc3_host_init(struct dwc3 *dwc)
 {
-	struct property_entry	props[5];
+	struct property_entry	props[6];
 	struct platform_device	*xhci;
 	int			ret, irq;
 	int			prop_idx = 0;
@@ -162,6 +162,9 @@ int dwc3_host_init(struct dwc3 *dwc)
 
 	props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk");
 
+	if (dwc->xhci_write_64_hi_lo_quirk)
+		props[prop_idx++] = PROPERTY_ENTRY_BOOL("write-64-hi-lo-quirk");
+
 	if (dwc->usb3_lpm_capable)
 		props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
 
-- 
2.7.4