diff options
| author | Tuowen Zhao <[email protected]> | 2019-10-16 15:06:29 -0600 |
|---|---|---|
| committer | Lee Jones <[email protected]> | 2019-11-11 08:40:21 +0000 |
| commit | a8ff78f7f773142eb8a8befe5a95dd6858ebd635 (patch) | |
| tree | 4074c52baf7fd1253450eafe4ea57d534e761b90 /lib/mpi/mpi-inline.h | |
| parent | e537654b7039aacfe8ae629d49655c0e5692ad44 (diff) | |
mfd: intel-lpss: Use devm_ioremap_uc for MMIO
Some BIOS erroneously specifies write-combining BAR for intel-lpss-pci
in MTRR. This will cause the system to hang during boot. If possible,
this bug could be corrected with a firmware update.
This patch use devm_ioremap_uc to overwrite/ignore the MTRR settings
by forcing the use of strongly uncachable pages for intel-lpss.
The BIOS bug is present on Dell XPS 13 7390 2-in-1:
[ 0.001734] 5 base 4000000000 mask 6000000000 write-combining
4000000000-7fffffffff : PCI Bus 0000:00
4000000000-400fffffff : 0000:00:02.0 (i915)
4010000000-4010000fff : 0000:00:15.0 (intel-lpss-pci)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=203485
Cc: <[email protected]> # v4.19+
Tested-by: AceLan Kao <[email protected]>
Signed-off-by: Tuowen Zhao <[email protected]>
Acked-by: Mika Westerberg <[email protected]>
Acked-by: Andy Shevchenko <[email protected]>
Tested-by: Roman Gilg <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Diffstat (limited to 'lib/mpi/mpi-inline.h')
0 files changed, 0 insertions, 0 deletions