* [PATCH] usb: uas: ignore UAS for ASMT135x bridges (174c:55aa)
@ 2026-10-11 16:42 Olivier Kaloudoff
2026-10-11 16:47 ` sashiko-bot
0 siblings, 1 reply; 2+ messages in thread
From: Olivier Kaloudoff @ 2026-10-11 16:42 UTC (permalink / raw)
To: linux-usb; +Cc: hdegoede, stern, Olivier Kaloudoff
The ASMedia chip detection in uas_use_uas_driver() assumes that every
device with idVendor/idProduct 174c:5106 or 174c:55aa reporting a
config.MaxPower of 0 is an ASM1153 with working UAS.
Newer ASMT135x bridges (iProduct "ASMT135x") share the same 174c:55aa
id and also report MaxPower == 0, so they take the "ASM1153, do
nothing" path — but their UAS implementation is broken:
- The first READ(16) issued by sd probing times out after 30 s;
enumeration only completes after a uas_eh_abort_handler plus a full
uas_eh_host_reset_handler cycle:
scsi 3:0:0:0: Direct-Access ASMT ASMT135x 0 PQ: 0 ANSI: 6
sd 3:0:0:0: [sdb] tag#26 uas_eh_abort_handler 0 uas-tag 1 inflight: CMD IN
sd 3:0:0:0: [sdb] tag#26 CDB: Read(16) 88 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00
scsi host3: uas_eh_host_reset_handler start
usb 6-2: reset SuperSpeed USB device number 2 using xhci_hcd
scsi host3: uas_eh_host_reset_handler success
- Under concurrent load the bridge stalls: all inflight commands (20+
UAS tags in the captured incident, mixed READ(16)/WRITE(16)) hit the
30 s UAS timeout in the same event, forcing repeated abort/reset
cycles and eventually a USB disconnect. Writes dropped mid-flight
during these resets returned zeros to the filesystem (observed as
XFS metadata corruption on the mounted volume).
- Sequential-write throughput is ~45 MiB/s under UAS versus ~136 MiB/s
after disabling UAS (usb-storage BOT mode), which is fully stable:
several tens of GiB written without a single error.
- Bulk reads of healthy LBA ranges do work under UAS (~190 MiB/s, no
errors); the failure pattern is command-timeout at enumeration and
under queue depth / write load, not a broken transfer path.
Since 174c:55aa is shared across several ASMedia bridges and enclosure
rebrandings, distinguish the ASMT135x by the product string — the same
approach used for the HIKSEMI MD202 check a few lines below. The
product strings of working ASM1053/ASM1153 devices ("ASM1053E",
"ASM1153", "ASM1153E", vendor rebrands such as "YZWY_TECH") do not
contain "135", so matching the ASMT135x family string is safe.
Verified on an ORICO enclosure (iManufacturer "ASMT", iProduct
"ASMT135x", bcdDevice 1.00) attached through an Alpine Ridge TB3 dock:
with the equivalent usb-storage quirks parameter (174c:55aa:u) the
device is completely stable.
Reported-by: Olivier Kaloudoff <olivier.kaloudoff@gmail.com>
Signed-off-by: Olivier Kaloudoff <olivier.kaloudoff@gmail.com>
---
drivers/usb/storage/uas-detect.h | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
lsusb -v output for the affected device (Bus 006) and a second
174c:55aa bridge on the same host (Bus 010, "YZWY_TECH", unaffected):
Couldn't open device, some information will be missing
Bus 006 Device 002: ID 174c:55aa ASMedia Technology Inc. ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge
Negotiated speed: SuperSpeed (5Gbps)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 3.20
bDeviceClass 0 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 9
idVendor 0x174c ASMedia Technology Inc.
idProduct 0x55aa ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge
bcdDevice 1.00
iManufacturer 2 ASMT
iProduct 3 ASMT135x
iSerial 1 123456789053
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0079
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk-Only
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 1
bNumEndpoints 4
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 98 USB Attached SCSI
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
MaxStreams 32
Data-in pipe (0x03)
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
MaxStreams 32
Data-out pipe (0x04)
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
MaxStreams 32
Status pipe (0x02)
Endpoint Descriptor:
bLength 7
bDescriptorTCouldn't open device, some information will be missing
ype 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 0
Command pipe (0x01)
Bus 010 Device 003: ID 174c:55aa ASMedia Technology Inc. ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge
Negotiated speed: SuperSpeed (5Gbps)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 3.00
bDeviceClass 0 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 9
idVendor 0x174c ASMedia Technology Inc.
idProduct 0x55aa ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge
bcdDevice 1.00
iManufacturer 2 Min Yi USB Device
iProduct 3 YZWY_TECH
iSerial 1 123456789020
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0079
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk-Only
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 1
bNumEndpoints 4
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 98 USB Attached SCSI
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
MaxStreams 32
Data-in pipe (0x03)
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
MaxStreams 32
Data-out pipe (0x04)
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 15
MaxStreams 32
Status pipe (0x02)
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 0
Command pipe (0x01)
diff --git a/drivers/usb/storage/uas-detect.h b/drivers/usb/storage/uas-detect.h
index 0000000..0000000 100644
--- a/drivers/usb/storage/uas-detect.h
+++ b/drivers/usb/storage/uas-detect.h
@@ -99,7 +99,17 @@
(le16_to_cpu(udev->descriptor.idProduct) == 0x5106 ||
le16_to_cpu(udev->descriptor.idProduct) == 0x55aa)) {
if (udev->actconfig->desc.bMaxPower == 0) {
- /* ASM1153, do nothing */
+ /*
+ * ASMT135x bridges share this signature but hang
+ * under UAS: commands stall until the 30 s UAS
+ * timeout, already during device probing, and a
+ * queue of inflight commands wedges the bridge
+ * entirely. Identify them by product string,
+ * same as the MD202 check below.
+ */
+ if (udev->product && strstr(udev->product, "135"))
+ flags |= US_FL_IGNORE_UAS;
+ /* else ASM1153, do nothing */
} else if (udev->speed < USB_SPEED_SUPER) {
/* No streams info, assume ASM1051 */
flags |= US_FL_IGNORE_UAS;
--
2.43.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] usb: uas: ignore UAS for ASMT135x bridges (174c:55aa)
2026-10-11 16:42 [PATCH] usb: uas: ignore UAS for ASMT135x bridges (174c:55aa) Olivier Kaloudoff
@ 2026-10-11 16:47 ` sashiko-bot
0 siblings, 0 replies; 2+ messages in thread
From: sashiko-bot @ 2026-10-11 16:47 UTC (permalink / raw)
To: Olivier Kaloudoff; +Cc: linux-usb
> The ASMedia chip detection in uas_use_uas_driver() assumes that every
> device with idVendor/idProduct 174c:5106 or 174c:55aa reporting a
> config.MaxPower of 0 is an ASM1153 with working UAS.
>
> Newer ASMT135x bridges (iProduct "ASMT135x") share the same 174c:55aa
> id and also report MaxPower == 0, so they take the "ASM1153, do
> nothing" path — but their UAS implementation is broken:
>
> - The first READ(16) issued by sd probing times out after 30 s;
> enumeration only completes after a uas_eh_abort_handler plus a full
> uas_eh_host_reset_handler cycle:
>
> scsi 3:0:0:0: Direct-Access ASMT ASMT135x 0 PQ: 0 ANSI: 6
> sd 3:0:0:0: [sdb] tag#26 uas_eh_abort_handler 0 uas-tag 1 inflight: CMD IN
> sd 3:0:0:0: [sdb] tag#26 CDB: Read(16) 88 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00
> [ ... ]
> with the equivalent usb-storage quirks parameter (174c:55aa:u) the
> device is completely stable.
>
> Reported-by: Olivier Kaloudoff <olivier.kaloudoff@gmail.com>
> Signed-off-by: Olivier Kaloudoff <olivier.kaloudoff@gmail.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261011164259.30572-1-olivier.kaloudoff@gmail.com?part=1
^ permalink raw reply [flat|nested] 2+ messages in thread
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