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| author | Gregory CLEMENT <gregory.clement@free-electrons.com> | 2014-09-02 10:15:17 +0200 |
|---|---|---|
| committer | Jason Cooper <jason@lakedaemon.net> | 2014-09-09 15:15:03 +0000 |
| commit | 5e1a63f5f548bb8a3967f00be2f0e1e04290c613 (patch) | |
| tree | 2878555f750315be3a51108b8dd16e8d19c61333 /drivers | |
| parent | 15917b16022427c53755abff4dc7051f3076dd7a (diff) | |
| download | linux-5e1a63f5f548bb8a3967f00be2f0e1e04290c613.tar.gz linux-5e1a63f5f548bb8a3967f00be2f0e1e04290c613.tar.bz2 linux-5e1a63f5f548bb8a3967f00be2f0e1e04290c613.zip | |
clk: mvebu: armada-370: Fix timer drift caused by the SSCG deviation
This commit activates the SSCG deviation correction for the Armada
370. It uses the optional function introduced by the commit "clk:
mvebu: Fix clk frequency value if SSCG is enabled".
Without this fix the deviation measured on a Mirabox was of a few
second each hour, whereas with this fix it was reduced at around
50ppm (around 4s per day).
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: Leigh Brown <leigh@solinno.co.uk>
Link: https://lkml.kernel.org/r/1409645719-20003-3-git-send-email-gregory.clement@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/clk/mvebu/armada-370.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/clk/mvebu/armada-370.c b/drivers/clk/mvebu/armada-370.c index bef198a83863..756f0f39d6a3 100644 --- a/drivers/clk/mvebu/armada-370.c +++ b/drivers/clk/mvebu/armada-370.c @@ -23,6 +23,7 @@ */ #define SARL 0 /* Low part [0:31] */ +#define SARL_A370_SSCG_ENABLE BIT(10) #define SARL_A370_PCLK_FREQ_OPT 11 #define SARL_A370_PCLK_FREQ_OPT_MASK 0xF #define SARL_A370_FAB_FREQ_OPT 15 @@ -133,10 +134,17 @@ static void __init a370_get_clk_ratio( } } +static bool a370_is_sscg_enabled(void __iomem *sar) +{ + return !(readl(sar) & SARL_A370_SSCG_ENABLE); +} + static const struct coreclk_soc_desc a370_coreclks = { .get_tclk_freq = a370_get_tclk_freq, .get_cpu_freq = a370_get_cpu_freq, .get_clk_ratio = a370_get_clk_ratio, + .is_sscg_enabled = a370_is_sscg_enabled, + .fix_sscg_deviation = kirkwood_fix_sscg_deviation, .ratios = a370_coreclk_ratios, .num_ratios = ARRAY_SIZE(a370_coreclk_ratios), }; |