Messages in this thread Patch in this message | | | From | Gregory CLEMENT <> | Subject | [PATCH V2 2/4] clk: mvebu: armada-370: Fix timer drift caused by the SSCG deviation | Date | Tue, 2 Sep 2014 10:15:17 +0200 |
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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> --- drivers/clk/mvebu/armada-370.c | 8 ++++++++ 1 file changed, 8 insertions(+)
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), }; -- 1.9.1
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