Re: [PATCH] USB and Driver Core patches for 2.6.10

[Greg KH]

ChangeSet 1.1938.446.30, 2004/12/17 11:41:02-08:00, mdharm-usb@xxxxxxxxxxxxxxxxxx

[PATCH] USB Storage: Increase Genesys delay

This is patch as436 from Alan Stern.

This patch increases the delay used for Genesys devices about 10%.  At
least one user reports that this created a significant improvement in
operation.

Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Matthew Dharm <mdharm-usb@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <greg@xxxxxxxxx>


 drivers/usb/storage/transport.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)


diff -Nru a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
--- a/drivers/usb/storage/transport.c	2005-01-07 15:46:51 -08:00
+++ b/drivers/usb/storage/transport.c	2005-01-07 15:46:51 -08:00
@@ -992,9 +992,10 @@
 	/* send/receive data payload, if there is any */
 
 	/* Genesys Logic interface chips need a 100us delay between the
-	 * command phase and the data phase */
+	 * command phase and the data phase.  Some devices need a little
+	 * more than that, probably because of clock rate inaccuracies. */
 	if (us->pusb_dev->descriptor.idVendor == USB_VENDOR_ID_GENESYS)
-		udelay(100);
+		udelay(110);
 
 	if (transfer_length) {
 		unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 

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