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From: Lee Jones <lee.jones@linaro.org>
To: Tuowen Zhao <ztuowen@gmail.com>
Cc: linux-kernel@vger.kernel.org, andriy.shevchenko@linux.intel.com,
	mika.westerberg@linux.intel.com, acelan.kao@canonical.com,
	mcgrof@kernel.org, davem@davemloft.net
Subject: Re: [PATCH v5 3/4] mfd: intel-lpss: use devm_ioremap_uc for MMIO
Date: Mon, 11 Nov 2019 08:41:14 +0000	[thread overview]
Message-ID: <20191111084114.GJ18902@dell> (raw)
In-Reply-To: <20191016210629.1005086-4-ztuowen@gmail.com>

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

  parent reply	other threads:[~2019-11-11  8:41 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-16 21:06 [PATCH v5 0/4] Fix MTRR bug for intel-lpss-pci Tuowen Zhao
2019-10-16 21:06 ` [PATCH v5 1/4] sparc64: implement ioremap_uc Tuowen Zhao
2019-10-16 21:20   ` David Miller
2019-10-28 20:46   ` Fwd: " Tuowen Zhao
2019-10-28 23:09     ` David Miller
2019-11-11  8:40     ` Fwd: " Lee Jones
2019-12-10  8:08   ` Geert Uytterhoeven
2019-10-16 21:06 ` [PATCH v5 2/4] lib: devres: add a helper function for ioremap_uc Tuowen Zhao
     [not found]   ` <20191017143144.9985421848@mail.kernel.org>
2019-10-17 17:49     ` Tuowen Zhao
2019-10-18 16:47       ` Sasha Levin
2019-12-04 15:51         ` Tuowen Zhao
2019-12-04 19:54           ` Andy Shevchenko
2019-12-04 20:06             ` Tuowen Zhao
2019-12-16 13:06           ` Greg KH
2019-12-16 18:02             ` Tuowen Zhao
2019-11-11  8:41   ` Lee Jones
2019-12-10  8:06     ` Geert Uytterhoeven
2019-12-10 12:50       ` Lee Jones
2019-10-16 21:06 ` [PATCH v5 3/4] mfd: intel-lpss: use devm_ioremap_uc for MMIO Tuowen Zhao
2019-10-22 19:01   ` Roman Gilg
2019-11-11  8:41   ` Lee Jones [this message]
2019-12-10  8:11   ` Geert Uytterhoeven
2019-10-16 21:06 ` [PATCH v5 4/4] docs: driver-model: add devm_ioremap_uc Tuowen Zhao
2019-10-23 11:26   ` Luis Chamberlain
2019-11-11  8:41   ` Lee Jones
2019-10-17  7:14 ` [PATCH v5 0/4] Fix MTRR bug for intel-lpss-pci Andy Shevchenko
2019-10-17  7:31   ` Lee Jones
2019-10-17  8:04     ` Andy Shevchenko
2019-10-17  8:22       ` Lee Jones
2019-10-17  9:52         ` Andy Shevchenko
2019-11-11  8:43 ` [GIT PULL] Immutable branch between MFD, Docs, Sparc and Lib Devres due for the v5.5 merge window Lee Jones

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