[1/4] davinci: cpuidle - use global variable for ddr2 flag

Commit Message

Daniel Lezcano Feb. 1, 2013, 1:48 p.m. UTC

Replace the flag by a simple global boolean in the cpuidle.c.
That will allow to cleanup the rest of the code right after,
because the ops won't make sense anymore.

Signed-off-by: Daniel Lezcano <[e-mail]>
---
 arch/arm/mach-davinci/cpuidle.c |   23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

Comments

Sekhar Nori Feb. 4, 2013, 9:48 a.m. UTC | #1

On 2/1/2013 7:18 PM, Daniel Lezcano wrote:
> +static bool ddr2_pdown = false;

checkpatch.pl warned against zero initialization of static variable
here. Other than that the series looks good. I checked that both state0
and state1 are entered on da850 evm. Making power measurements requires
more elaborate setup so I left that out.

Target residency of state1 seems high and it is entered very
infrequently. But that's not something introduced by this series. So for
all the patches, you can add:

Acked-by: Sekhar Nori <[e-mail]>

Thanks,
Sekhar

Patch

diff --git a/arch/arm/mach-davinci/cpuidle.c b/arch/arm/mach-davinci/cpuidle.c
index 9107691..ebb8808 100644
--- a/arch/arm/mach-davinci/cpuidle.c
+++ b/arch/arm/mach-davinci/cpuidle.c
@@ -26,8 +26,8 @@ 
 #define DAVINCI_CPUIDLE_MAX_STATES	2
 
 struct davinci_ops {
-	void (*enter) (u32 flags);
-	void (*exit) (u32 flags);
+	void (*enter) (void);
+	void (*exit) (void);
 	u32 flags;
 };
 
@@ -40,20 +40,17 @@  static int davinci_enter_idle(struct cpuidle_device *dev,
 	struct davinci_ops *ops = cpuidle_get_statedata(state_usage);
 
 	if (ops && ops->enter)
-		ops->enter(ops->flags);
+		ops->enter();
 
 	index = cpuidle_wrap_enter(dev,	drv, index,
 				arm_cpuidle_simple_enter);
 
 	if (ops && ops->exit)
-		ops->exit(ops->flags);
+		ops->exit();
 
 	return index;
 }
 
-/* fields in davinci_ops.flags */
-#define DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN	BIT(0)
-
 static struct cpuidle_driver davinci_idle_driver = {
 	.name			= "cpuidle-davinci",
 	.owner			= THIS_MODULE,
@@ -72,6 +69,7 @@  static struct cpuidle_driver davinci_idle_driver = {
 
 static DEFINE_PER_CPU(struct cpuidle_device, davinci_cpuidle_device);
 static void __iomem *ddr2_reg_base;
+static bool ddr2_pdown = false;
 
 static void davinci_save_ddr_power(int enter, bool pdown)
 {
@@ -92,14 +90,14 @@  static void davinci_save_ddr_power(int enter, bool pdown)
 	__raw_writel(val, ddr2_reg_base + DDR2_SDRCR_OFFSET);
 }
 
-static void davinci_c2state_enter(u32 flags)
+static void davinci_c2state_enter(void)
 {
-	davinci_save_ddr_power(1, !!(flags & DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN));
+	davinci_save_ddr_power(1, ddr2_pdown);
 }
 
-static void davinci_c2state_exit(u32 flags)
+static void davinci_c2state_exit(void)
 {
-	davinci_save_ddr_power(0, !!(flags & DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN));
+	davinci_save_ddr_power(0, ddr2_pdown);
 }
 
 static struct davinci_ops davinci_states[DAVINCI_CPUIDLE_MAX_STATES] = {
@@ -124,8 +122,7 @@  static int __init davinci_cpuidle_probe(struct platform_device *pdev)
 
 	ddr2_reg_base = pdata->ddr2_ctlr_base;
 
-	if (pdata->ddr2_pdown)
-		davinci_states[1].flags |= DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN;
+	ddr2_pdown = pdata->ddr2_pdown;
 	cpuidle_set_statedata(&device->states_usage[1], &davinci_states[1]);
 
 	device->state_count = DAVINCI_CPUIDLE_MAX_STATES;