linux-kernel - [PATCH] xhci-pci: set the dma max_seg

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Message-Id: <20221213-xhci-max_seg_size-v1-0-608f716a3792@chromium.org>
Date:   Tue, 13 Dec 2022 16:08:22 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Takashi Iwai <tiwai@...e.de>, linux-usb@...r.kernel.org,
        Ricardo Ribalda <ribalda@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] xhci-pci: set the dma max_seg_size

Allow devices to have dma operations beyond 64K, and avoid warnings such
as:

xhci_hcd 0000:00:14.0: mapping sg segment longer than device claims to support [len=98304] [max=65536]

Cc: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
To: Mathias Nyman <mathias.nyman@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/usb/host/xhci-pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 7bccbe50bab1..116a2f328772 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -453,6 +453,8 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
 		pm_runtime_allow(&dev->dev);
 
+	dma_set_max_seg_size(&dev->dev, UINT_MAX);
+
 	return 0;
 
 put_usb3_hcd:

---
base-commit: 0ec5a38bf8499f403f81cb81a0e3a60887d1993c
change-id: 20221213-xhci-max_seg_size-de366fbf12bc

Best regards,
-- 
Ricardo Ribalda <ribalda@...omium.org>