Messages in this thread | | | Date | Mon, 11 Nov 2019 08:41:14 +0000 | From | Lee Jones <> | Subject | Re: [PATCH v5 3/4] mfd: intel-lpss: use devm_ioremap_uc for MMIO |
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On Wed, 16 Oct 2019, Tuowen Zhao wrote:
> 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: <stable@vger.kernel.org> > Tested-by: AceLan Kao <acelan.kao@canonical.com> > Signed-off-by: Tuowen Zhao <ztuowen@gmail.com> > Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> > Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org> > --- > drivers/mfd/intel-lpss.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-)
Applied, thanks.
-- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog
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