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authorGregory CLEMENT <gregory.clement@free-electrons.com>2014-09-02 12:15:17 +0400
committerJason Cooper <jason@lakedaemon.net>2014-09-09 19:15:03 +0400
commit5e1a63f5f548bb8a3967f00be2f0e1e04290c613 (patch)
tree2878555f750315be3a51108b8dd16e8d19c61333 /drivers/clk/mvebu
parent15917b16022427c53755abff4dc7051f3076dd7a (diff)
downloadlinux-5e1a63f5f548bb8a3967f00be2f0e1e04290c613.tar.xz
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/clk/mvebu')
-rw-r--r--drivers/clk/mvebu/armada-370.c8
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),
};