diff options
Diffstat (limited to 'drivers/staging/brcm80211/include/hnddma.h')
| -rw-r--r-- | drivers/staging/brcm80211/include/hnddma.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/staging/brcm80211/include/hnddma.h b/drivers/staging/brcm80211/include/hnddma.h index 5d079e77490e..fbbcb9b5ae62 100644 --- a/drivers/staging/brcm80211/include/hnddma.h +++ b/drivers/staging/brcm80211/include/hnddma.h @@ -204,4 +204,23 @@ extern const di_fcn_t dma64proc; extern uint dma_addrwidth(si_t *sih, void *dmaregs); void dma_walk_packets(struct hnddma_pub *dmah, void (*callback_fnc) (void *pkt, void *arg_a), void *arg_a); + +/* + * DMA(Bug) on some chips seems to declare that the packet is ready, but the + * packet length is not updated yet (by DMA) on the expected time. + * Workaround is to hold processor till DMA updates the length, and stay off + * the bus to allow DMA update the length in buffer + */ +static inline void dma_spin_for_len(uint len, struct sk_buff *head) +{ +#if defined(__mips__) + if (!len) { + while (!(len = *(u16 *) KSEG1ADDR(head->data))) + udelay(1); + + *(u16 *) (head->data) = cpu_to_le16((u16) len); + } +#endif /* defined(__mips__) */ +} + #endif /* _hnddma_h_ */ |