diff options
| -rw-r--r-- | hw/phb3.c | 13 |
1 files changed, 11 insertions, 2 deletions
@@ -3344,8 +3344,17 @@ static int64_t enable_capi_mode(struct phb3 *p, uint64_t pe_number, bool dma_mod /* aib tx cmd cred */ xscom_read(p->chip_id, p->pci_xscom + 0xd, ®); - reg &= ~PPC_BITMASK(42,46); - reg |= PPC_BIT(47); + if (dma_mode) { + /* + * In DMA mode, increase AIB credit value for ch 2 (DMA read) + * for performance reasons + */ + reg &= ~PPC_BITMASK(42, 47); + reg |= PPC_BITMASK(43, 45); + } else { + reg &= ~PPC_BITMASK(42, 46); + reg |= PPC_BIT(47); + } xscom_write(p->chip_id, p->pci_xscom + 0xd, reg); xscom_write(p->chip_id, p->pci_xscom + 0xc, 0xff00000000000000ull); |