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[U-Boot,RFC,v2,2/9] x86: quark: Bypass TSC calibration

Message ID 1423150948-26613-3-git-send-email-bmeng.cn@gmail.com
State Accepted
Delegated to: Simon Glass
Headers show

Commit Message

Bin Meng Feb. 5, 2015, 3:42 p.m. UTC 
For some unknown reason, the TSC calibration via PIT does not work on
Quark. Enable bypassing TSC calibration and override TSC_FREQ_IN_MHZ
to 400 per Quark datasheet in the Kconfig.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
---

Changes in v2: None

 arch/x86/cpu/quark/Kconfig | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Simon Glass Feb. 6, 2015, 8:26 p.m. UTC | #1 
On 5 February 2015 at 08:42, Bin Meng <bmeng.cn@gmail.com> wrote:
> For some unknown reason, the TSC calibration via PIT does not work on
> Quark. Enable bypassing TSC calibration and override TSC_FREQ_IN_MHZ
> to 400 per Quark datasheet in the Kconfig.
>
> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
> Acked-by: Simon Glass <sjg@chromium.org>

Applied to u-boot-x86, thanks!
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Patch

diff --git a/arch/x86/cpu/quark/Kconfig b/arch/x86/cpu/quark/Kconfig
index 163caac..bc961ef 100644
--- a/arch/x86/cpu/quark/Kconfig
+++ b/arch/x86/cpu/quark/Kconfig
@@ -7,6 +7,7 @@ 
 config INTEL_QUARK
 	bool
 	select HAVE_RMU
+	select TSC_CALIBRATION_BYPASS
 
 if INTEL_QUARK
 
@@ -118,4 +119,8 @@  config SYS_CAR_SIZE
 	  Space in bytes in eSRAM used as Cache-As-ARM (CAR).
 	  Note this size must not exceed eSRAM's total size.
 
+config TSC_FREQ_IN_MHZ
+	int
+	default 400
+
 endif