From: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Date: Thu, 1 Dec 2011 20:13:02 +0000 (+0100)
Subject: ARM: OMAP1: recalculate loops per jiffy after dpll1 reprogram
X-Git-Tag: firefly_0821_release~3680^2~3791^2~8^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6560ee07dc946e94f7cc2cd8e3b5a5f5ee7340c1;p=firefly-linux-kernel-4.4.55.git

ARM: OMAP1: recalculate loops per jiffy after dpll1 reprogram

Otherwise timing is inaccurate, resulting in devices which depend on it,
like omap-keypad, broken.

Tested on Amstrad Delta.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
[tony@atomide.com: removed comment referencing a development branch]
Signed-off-by: Tony Lindgren <tony@atomide.com>
---

diff --git a/arch/arm/mach-omap1/clock_data.c b/arch/arm/mach-omap1/clock_data.c
index 86b2dec11788..9ff90a744a21 100644
--- a/arch/arm/mach-omap1/clock_data.c
+++ b/arch/arm/mach-omap1/clock_data.c
@@ -16,6 +16,8 @@
 
 #include <linux/kernel.h>
 #include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/delay.h>
 #include <linux/io.h>
 
 #include <asm/mach-types.h>  /* for machine_is_* */
@@ -927,7 +929,9 @@ int __init omap1_clk_init(void)
 
 void __init omap1_clk_late_init(void)
 {
-	if (ck_dpll1.rate >= OMAP1_DPLL1_SANE_VALUE)
+	unsigned long rate = ck_dpll1.rate;
+
+	if (rate >= OMAP1_DPLL1_SANE_VALUE)
 		return;
 
 	/* System booting at unusable rate, force reprogramming of DPLL1 */
@@ -942,4 +946,5 @@ void __init omap1_clk_late_init(void)
 	}
 	propagate_rate(&ck_dpll1);
 	omap1_show_rates();
+	loops_per_jiffy = cpufreq_scale(loops_per_jiffy, rate, ck_dpll1.rate);
 }