diff mbox series

[v2,8/8] usb: cdns3: gadget: enlarge the TRB ring length

Message ID 20200910091130.20937-9-peter.chen@nxp.com (mailing list archive)
State New, archived
Headers show
Series usb: cdns3: improve the sg use case | expand

Commit Message

Peter Chen Sept. 10, 2020, 9:11 a.m. UTC 
At Android ADB and MTP use case, it uses f_fs which supports scatter list,
it means one request may need several TRBs for it. Besides, TRB consumes
very fast compared to TRB has prepared for above use case, there are at
most 120 pending requests, the date size is 16KB for each request, so four
TRBs (4KB per TRB) per sg entry at worst case. so we need to enlarge the
TRB ring length to avoid "no free TRB error". Since each TRB only consumes
12 bytes (3 * 32 bits), we enlarge the TRB length to 600, it leaves some
buffers for potential "no free TRB error", and only increases a little
memory cost.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
---
 drivers/usb/cdns3/gadget.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/usb/cdns3/gadget.h b/drivers/usb/cdns3/gadget.h
index 9f8bd452847e..1ccecd237530 100644
--- a/drivers/usb/cdns3/gadget.h
+++ b/drivers/usb/cdns3/gadget.h
@@ -966,7 +966,7 @@  struct cdns3_usb_regs {
 /*
  * USBSS-DEV DMA interface.
  */
-#define TRBS_PER_SEGMENT	40
+#define TRBS_PER_SEGMENT	600
 
 #define ISO_MAX_INTERVAL	10