[PATCH v2] scsi: Adjust SCSI inquiry command data length

[Macpaul Lin]

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 at mediatek.com>
Signed-off-by: Macpaul Lin <macpaul.lin at mediatek.com>
---
 drivers/scsi/scsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Changes for v2:
 - Update commit message according to the review discussions. 

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 8fe6b38a8c74..116b696b08dd 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -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)) {
-- 
2.45.2