diff options
| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2017-06-26 10:18:55 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2017-06-28 06:55:01 -0700 |
| commit | 25f1e18870881f3366a5abec27b651983ce9032c (patch) | |
| tree | dd890a4805e5505ad46dd430c023a9dc5606f215 /drivers/base | |
| parent | 63d36c95500400642f656ba1970980746cf437f3 (diff) | |
dma: Take into account dma_pfn_offset
Even though dma-noop-ops assumes 1:1 memory mapping DMA memory range
can be different to RAM. For example, ARM STM32F4 MCU offers the
possibility to remap SDRAM from 0xc000_0000 to 0x0 to get CPU
performance boost, but DMA continue to see SDRAM at 0xc000_0000. This
difference in mapping is handled via device-tree "dma-range" property
which leads to dev->dma_pfn_offset is set nonzero. To handle such
cases take dma_pfn_offset into account.
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Reported-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Tested-by: Andras Szemzo <sza@esh.hu>
Tested-by: Alexandre TORGUE <alexandre.torgue@st.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/base')
0 files changed, 0 insertions, 0 deletions