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scsi: Adjust SCSI inquiry command data length

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Per the SCSI SPC-4 specification, the standard inquiry data length
should not be less than 36 bytes. The current implementation uses 512
bytes, which causes detection failures on some UFS devices (e.g.,
Longsys) that do not expect a transfer length exceeding the standard
inquiry size.

Align the default standard inquiry length with the Linux kernel's
implementation (see drivers/scsi/scsi_scan.c), which uses 36 bytes as
the default. Devices requiring vendor-specific inquiry lengths should
be handled through quirk settings in the future.

Signed-off-by: ht.lin <ht.lin@mediatek.com>
Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
Reviewed-by: Marek Vasut <marek.vasut@mailbox.org>
This commit is contained in:
Macpaul Lin
2026-03-05 18:23:24 +08:00
committed by Tom Rini
parent c4fcf9b806
commit 041364141b
1 changed files with 1 additions and 1 deletions
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2
drivers/scsi/scsi.c
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@@ -513,7 +513,7 @@ static int scsi_detect_dev(struct udevice *dev, int target, int lun,
pccb->target = target;
pccb->lun = lun;
pccb->pdata = tempbuff;
pccb->datalen = 512;
pccb->datalen = 36;
pccb->dma_dir = DMA_FROM_DEVICE;
scsi_setup_inquiry(pccb);
if (scsi_exec(dev, pccb)) {