Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 5e1a63f5 authored by Gregory CLEMENT's avatar Gregory CLEMENT Committed by Jason Cooper
Browse files

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: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: default avatarLeigh 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: default avatarJason Cooper <jason@lakedaemon.net>
parent 15917b16

drivers/clk/mvebu/armada-370.c

+8 −0
Original line number Original line Diff line number Diff line
@@ -23,6 +23,7 @@ 
 */

 */





#define SARL				0	/* Low part [0:31] */

#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	11

#define	 SARL_A370_PCLK_FREQ_OPT_MASK	0xF

#define	 SARL_A370_PCLK_FREQ_OPT_MASK	0xF

#define	 SARL_A370_FAB_FREQ_OPT		15

#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 = {

static const struct coreclk_soc_desc a370_coreclks = {

	.get_tclk_freq = a370_get_tclk_freq,

	.get_tclk_freq = a370_get_tclk_freq,

	.get_cpu_freq = a370_get_cpu_freq,

	.get_cpu_freq = a370_get_cpu_freq,

	.get_clk_ratio = a370_get_clk_ratio,

	.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,

	.ratios = a370_coreclk_ratios,

	.num_ratios = ARRAY_SIZE(a370_coreclk_ratios),

	.num_ratios = ARRAY_SIZE(a370_coreclk_ratios),

};

};