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usb: musb: gadget: don't program dma for zero byte tx 

This is to reduce the overhead of dma programming for zero byte
transmit as same can be done using pio mode.

Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Ajay Kumar Gupta 2012-07-20 11:07:23 +05:30 committed by Felipe Balbi
parent 3132122c66
commit d17d535fec
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/musb/musb_gadget.c
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@ -373,7 +373,7 @@ static void txstate(struct musb *musb, struct musb_request *req)
request_size = min_t(size_t, request->length - request->actual,
musb_ep->dma->max_len);
use_dma = (request->dma != DMA_ADDR_INVALID);
use_dma = (request->dma != DMA_ADDR_INVALID && request_size);
/* MUSB_TXCSR_P_ISO is still set correctly */