linux-kernel - [PATCH v3 3/3] usb: host: xhci-plat: Add support for XHCI_WRITE_64_HI

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Date: Mon, 10 Jun 2024 20:39:13 +0900
From: Daehwan Jung <dh10.jung@...sung.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Thinh Nguyen
	<Thinh.Nguyen@...opsys.com>, Mathias Nyman <mathias.nyman@...el.com>
Cc: linux-usb@...r.kernel.org (open list:USB SUBSYSTEM),
	linux-kernel@...r.kernel.org (open list), h10.kim@...sung.com, Daehwan Jung
	<dh10.jung@...sung.com>
Subject: [PATCH v3 3/3] usb: host: xhci-plat: Add support for
 XHCI_WRITE_64_HI_LO

xHCI specification 5.1 "Register Conventions" states that 64 bit
registers should be written in low-high order. All writing operations
in xhci is done low-high order following the spec.

Add a new quirk to support workaround for high-low order.

Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
---
v1 -> v2:
- this patch is added newly in the patchset
- add setting the hi-lo quirk in xhci platform
v2 -> v3:
- add description in commit message.
---
 drivers/usb/host/xhci-plat.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 3d071b8..31bdfa5 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -256,6 +256,9 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
 		if (device_property_read_bool(tmpdev, "xhci-sg-trb-cache-size-quirk"))
 			xhci->quirks |= XHCI_SG_TRB_CACHE_SIZE_QUIRK;
 
+		if (device_property_read_bool(tmpdev, "write-64-hi-lo-quirk"))
+			xhci->quirks |= XHCI_WRITE_64_HI_LO;
+
 		device_property_read_u32(tmpdev, "imod-interval-ns",
 					 &xhci->imod_interval);
 	}
-- 
2.7.4