diff options
Diffstat (limited to 'include/linux/io-pgtable.h')
| -rw-r--r-- | include/linux/io-pgtable.h | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index 915fb7303aa3..a2a52c349fe4 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -65,10 +65,9 @@ struct io_pgtable_cfg { * (unmapped) entries but the hardware might do so anyway, perform * TLB maintenance when mapping as well as when unmapping. * - * IO_PGTABLE_QUIRK_ARM_MTK_EXT: (ARM v7s format) Set bit 9 in all - * PTEs, for Mediatek IOMMUs which treat it as a 33rd address bit - * when the SoC is in "4GB mode" and they can only access the high - * remap of DRAM (0x1_00000000 to 0x1_ffffffff). + * IO_PGTABLE_QUIRK_ARM_MTK_EXT: (ARM v7s format) MediaTek IOMMUs extend + * to support up to 34 bits PA where the bit32 and bit33 are + * encoded in the bit9 and bit4 of the PTE respectively. * * IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs * on unmap, for DMA domains using the flush queue mechanism for |