From: olof@lixom•net (Olof Johansson)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH V2] arm/tegra: Support Tegra30 in decompressor UART setup
Date: Wed, 18 Jan 2012 20:21:39 -0800 [thread overview]
Message-ID: <20120119042139.GD7145@quad.lixom.net> (raw)
In-Reply-To: <1325628347-22140-1-git-send-email-swarren@nvidia.com>
On Tue, Jan 03, 2012 at 03:05:47PM -0700, Stephen Warren wrote:
> On Tegra20, the UART clock runs at 216MHz, whereas on Tegra30 it runs at
> 408MHz. Modify arch_decomp_setup() to detect Tegra20-vs-Tegra30 at run-
> time, and program the correct divisor.
>
> This makes uncompressor messages work correctly on Tegra30. This also
> fixes early printk, assuming zImage is used and this setup code runs.
>
> v2: Use CHIPID register to differentiate between chips, rather than a
> GIC register. This should be more future-proof. Volatile is required
> to prevent the compiler transforming the 32-bit apb_misc register read
> into an 8-bit read of address 1 higher, since the HW only supports 32-
> bit accesses, and will hang on an 8-bit access.
>
> Signed-off-by: Stephen Warren <swarren@nvidia•com>
Thanks, applied.
-Olof
prev parent reply other threads:[~2012-01-19 4:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-03 22:05 [PATCH V2] arm/tegra: Support Tegra30 in decompressor UART setup Stephen Warren
2012-01-19 4:21 ` Olof Johansson [this message]
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