diff options
Diffstat (limited to 'drivers/usb/host/ehci.h')
| -rw-r--r-- | drivers/usb/host/ehci.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index cfbdf32ec0b2..569cdf5a4c03 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -767,10 +767,32 @@ static inline void ehci_sync_mem(void) { mb(); } + +/* + * DMA coherent memory on ARM which features speculative prefetcher doesn't + * guarantee coherency, so introduce the helpers which can invalidate QH and + * QTD in L1/L2 cache. It enforces CPU reads from memory directly. + */ +static inline void ehci_sync_qh(struct ehci_hcd *ehci, struct ehci_qh *qh) +{ + dma_sync_single_for_cpu(ehci_to_hcd(ehci)->self.controller, qh->qh_dma, + sizeof(struct ehci_qh_hw), DMA_FROM_DEVICE); +} +static inline void ehci_sync_qtd(struct ehci_hcd *ehci, struct ehci_qtd *qtd) +{ + dma_sync_single_for_cpu(ehci_to_hcd(ehci)->self.controller, + qtd->qtd_dma, sizeof(struct ehci_qtd), DMA_FROM_DEVICE); +} #else static inline void ehci_sync_mem() { } +static inline void ehci_sync_qh(struct ehci_hcd *ehci, struct ehci_qh *qh) +{ +} +static inline void ehci_sync_qtd(struct ehci_hcd *ehci, struct ehci_qtd *qtd) +{ +} #endif /*-------------------------------------------------------------------------*/ |