linux-kernel - [PATCH] usb: dwc3: set the dma max_seg

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Message-Id: <20231026-dwc3-v1-1-643c74771599@chromium.org>
Date:   Thu, 26 Oct 2023 12:28:36 +0000
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Zubin Mithra <zsm@...omium.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH] usb: dwc3: set the dma max_seg_size

Allow devices to have dma operations beyond 4K, and avoid warnings such
as:

DMA-API: dwc3 a600000.usb: mapping sg segment longer than device claims to support [len=86016] [max=65536]

Reported-by: Zubin Mithra <zsm@...omium.org>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
Found while running 
yavta -f YUYV -s 1280x720 -c  /dev/video0

with:

CONFIG_DMA_API_DEBUG=y
---
 drivers/usb/dwc3/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 343d2570189f..65f73dd8ef47 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1918,6 +1918,8 @@ static int dwc3_probe(struct platform_device *pdev)
 
 	pm_runtime_put(dev);
 
+	dma_set_max_seg_size(dev, UINT_MAX);
+
 	return 0;
 
 err_exit_debugfs:

---
base-commit: 611da07b89fdd53f140d7b33013f255bf0ed8f34
change-id: 20231026-dwc3-fac74fcb3b2a

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