[ARM] omap: arrange for clock recalc methods to return the rate

linux-omap source commit 33d000c99ee393fe2042f93e8422f94976d276ce
introduces a way to "dry run" clock changes before they're committed.
However, this involves putting logic to handle this into each and
every recalc function, and unfortunately due to the caching, led to
some bugs.

Solve both of issues by making the recalc methods always return the
clock rate for the clock, which the caller decides what to do with.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 17 insertions, 25 deletions

diff --git a/arch/arm/mach-omap1/clock.c b/arch/arm/mach-omap1/clock.c
index ccf989f..dafe4f7 100644
--- a/arch/arm/mach-omap1/clock.c
+++ b/arch/arm/mach-omap1/clock.c
@@ -156,27 +156,25 @@ __u32 arm_idlect1_mask;
  * Omap1 specific clock functions
  *-------------------------------------------------------------------------*/
 
-static void omap1_watchdog_recalc(struct clk * clk)
+static unsigned long omap1_watchdog_recalc(struct clk *clk)
 {
-	clk->rate = clk->parent->rate / 14;
+	return clk->parent->rate / 14;
 }
 
-static void omap1_uart_recalc(struct clk * clk)
+static unsigned long omap1_uart_recalc(struct clk *clk)
 {
 	unsigned int val = __raw_readl(clk->enable_reg);
-	if (val & clk->enable_bit)
-		clk->rate = 48000000;
-	else
-		clk->rate = 12000000;
+	return val & clk->enable_bit ? 48000000 : 12000000;
 }
 
-static void omap1_sossi_recalc(struct clk *clk)
+static unsigned long omap1_sossi_recalc(struct clk *clk)
 {
 	u32 div = omap_readl(MOD_CONF_CTRL_1);
 
 	div = (div >> 17) & 0x7;
 	div++;
-	clk->rate = clk->parent->rate / div;
+
+	return clk->parent->rate / div;
 }
 
 static int omap1_clk_enable_dsp_domain(struct clk *clk)
@@ -344,19 +342,15 @@ static int calc_dsor_exp(struct clk *clk, unsigned long rate)
 	return dsor_exp;
 }
 
-static void omap1_ckctl_recalc(struct clk * clk)
+static unsigned long omap1_ckctl_recalc(struct clk *clk)
 {
-	int dsor;
-
 	/* Calculate divisor encoded as 2-bit exponent */
-	dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
+	int dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
 
-	if (unlikely(clk->rate == clk->parent->rate / dsor))
-		return; /* No change, quick exit */
-	clk->rate = clk->parent->rate / dsor;
+	return clk->parent->rate / dsor;
 }
 
-static void omap1_ckctl_recalc_dsp_domain(struct clk * clk)
+static unsigned long omap1_ckctl_recalc_dsp_domain(struct clk *clk)
 {
 	int dsor;
 
@@ -371,9 +365,7 @@ static void omap1_ckctl_recalc_dsp_domain(struct clk * clk)
 	dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
 	omap1_clk_disable(&api_ck.clk);
 
-	if (unlikely(clk->rate == clk->parent->rate / dsor))
-		return; /* No change, quick exit */
-	clk->rate = clk->parent->rate / dsor;
+	return clk->parent->rate / dsor;
 }
 
 /* MPU virtual clock functions */
diff --git a/arch/arm/mach-omap1/clock.h b/arch/arm/mach-omap1/clock.h
index 28bc74e..17f8742 100644
--- a/arch/arm/mach-omap1/clock.h
+++ b/arch/arm/mach-omap1/clock.h
@@ -13,14 +13,14 @@
 #ifndef __ARCH_ARM_MACH_OMAP1_CLOCK_H
 #define __ARCH_ARM_MACH_OMAP1_CLOCK_H
 
-static void omap1_ckctl_recalc(struct clk * clk);
-static void omap1_watchdog_recalc(struct clk * clk);
+static unsigned long omap1_ckctl_recalc(struct clk *clk);
+static unsigned long omap1_watchdog_recalc(struct clk *clk);
 static int omap1_set_sossi_rate(struct clk *clk, unsigned long rate);
-static void omap1_sossi_recalc(struct clk *clk);
-static void omap1_ckctl_recalc_dsp_domain(struct clk * clk);
+static unsigned long omap1_sossi_recalc(struct clk *clk);
+static unsigned long omap1_ckctl_recalc_dsp_domain(struct clk *clk);
 static int omap1_clk_set_rate_dsp_domain(struct clk * clk, unsigned long rate);
 static int omap1_set_uart_rate(struct clk * clk, unsigned long rate);
-static void omap1_uart_recalc(struct clk * clk);
+static unsigned long omap1_uart_recalc(struct clk *clk);
 static int omap1_set_ext_clk_rate(struct clk * clk, unsigned long rate);
 static long omap1_round_ext_clk_rate(struct clk * clk, unsigned long rate);
 static void omap1_init_ext_clk(struct clk * clk);