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Date: Wed, 21 Mar 2012 09:28:18 -0500
From: Rob Lee <rob.lee@...aro.org>
To: len.brown@...el.com, "Nori, Sekhar" <nsekhar@...com>,
Kevin Hilman <khilman@...com>
Cc: akpm@...ux-foundation.org, rjw@...k.pl, robherring2@...il.com,
Baohua.Song@....com, amit.kucheria@...aro.org,
nicolas.ferre@...el.com, linux@...im.org.za, kgene.kim@...sung.com,
amit.kachhap@...aro.org, magnus.damm@...il.com,
daniel.lezcano@...aro.org, mturquette@...aro.org,
vincent.guittot@...aro.org, arnd.bergmann@...aro.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linaro-dev@...ts.linaro.org, patches@...aro.org,
deepthi@...ux.vnet.ibm.com, broonie@...nsource.wolfsonmicro.com,
nicolas.pitre@...aro.org, linux@....linux.org.uk,
jean.pihet@...oldbits.com, venki@...gle.com, ccross@...gle.com,
g.trinabh@...il.com, kernel@...tstofly.org, lethal@...ux-sh.org,
jon-hunter@...com, tony@...mide.com, linux-omap@...r.kernel.org,
linux-sh@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v8 4/8] ARM: davinci: Consolidate time keeping and irq enable
Sekhar tested this patch on Davinci last night and found a problem. I
looked at the code again and found a mindless omission on my part (see
below). Fix is trivial. I've check all other platforms and confirmed
this problem does not exist for those. Will resend a v9 of the
patchset shortly.
On Tue, Mar 20, 2012 at 3:22 PM, Robert Lee <rob.lee@...aro.org> wrote:
> Enable core cpuidle timekeeping and irq enabling and remove that
> handling from this code.
>
> Signed-off-by: Robert Lee <rob.lee@...aro.org>
> Reviewed-by: Kevin Hilman <khilman@...com>
> Reviewed-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> Acked-by: Jean Pihet<j-pihet@...com>
> ---
> arch/arm/mach-davinci/cpuidle.c | 82 ++++++++++++++++-----------------------
> 1 file changed, 33 insertions(+), 49 deletions(-)
>
> diff --git a/arch/arm/mach-davinci/cpuidle.c b/arch/arm/mach-davinci/cpuidle.c
> index a30c7c5..93ae096 100644
> --- a/arch/arm/mach-davinci/cpuidle.c
> +++ b/arch/arm/mach-davinci/cpuidle.c
> @@ -18,6 +18,7 @@
> #include <linux/io.h>
> #include <linux/export.h>
> #include <asm/proc-fns.h>
> +#include <asm/cpuidle.h>
>
> #include <mach/cpuidle.h>
> #include <mach/ddr2.h>
> @@ -30,12 +31,42 @@ struct davinci_ops {
> u32 flags;
> };
>
> +/* Actual code that puts the SoC in different idle states */
> +static int davinci_enter_idle(struct cpuidle_device *dev,
> + struct cpuidle_driver *drv,
> + int index)
> +{
> + struct cpuidle_state_usage *state_usage = &dev->states_usage[index];
> + struct davinci_ops *ops = cpuidle_get_statedata(state_usage);
> +
> + if (ops && ops->enter)
> + ops->enter(ops->flags);
> +
> + index = cpuidle_wrap_enter(dev, drv, index,
> + arm_cpuidle_simple_enter);
> +
> + if (ops && ops->exit)
> + ops->exit(ops->flags);
> +
> + 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,
> + .name = "cpuidle-davinci",
> + .owner = THIS_MODULE,
Argh! I am missing the ".en_core_tk_irqen = 1" here.
> + .states[0] = ARM_CPUIDLE_WFI_STATE,
> + .states[1] = {
> + .enter = davinci_enter_idle,
> + .exit_latency = 10,
> + .target_residency = 100000,
> + .flags = CPUIDLE_FLAG_TIME_VALID,
> + .name = "DDR SR",
> + .desc = "WFI and DDR Self Refresh",
> + },
> + .state_count = DAVINCI_CPUIDLE_MAX_STATES,
> };
>
> static DEFINE_PER_CPU(struct cpuidle_device, davinci_cpuidle_device);
> @@ -77,41 +108,10 @@ static struct davinci_ops davinci_states[DAVINCI_CPUIDLE_MAX_STATES] = {
> },
> };
>
> -/* Actual code that puts the SoC in different idle states */
> -static int davinci_enter_idle(struct cpuidle_device *dev,
> - struct cpuidle_driver *drv,
> - int index)
> -{
> - struct cpuidle_state_usage *state_usage = &dev->states_usage[index];
> - struct davinci_ops *ops = cpuidle_get_statedata(state_usage);
> - struct timeval before, after;
> - int idle_time;
> -
> - local_irq_disable();
> - do_gettimeofday(&before);
> -
> - if (ops && ops->enter)
> - ops->enter(ops->flags);
> - /* Wait for interrupt state */
> - cpu_do_idle();
> - if (ops && ops->exit)
> - ops->exit(ops->flags);
> -
> - do_gettimeofday(&after);
> - local_irq_enable();
> - idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
> - (after.tv_usec - before.tv_usec);
> -
> - dev->last_residency = idle_time;
> -
> - return index;
> -}
> -
> static int __init davinci_cpuidle_probe(struct platform_device *pdev)
> {
> int ret;
> struct cpuidle_device *device;
> - struct cpuidle_driver *driver = &davinci_idle_driver;
> struct davinci_cpuidle_config *pdata = pdev->dev.platform_data;
>
> device = &per_cpu(davinci_cpuidle_device, smp_processor_id());
> @@ -123,27 +123,11 @@ static int __init davinci_cpuidle_probe(struct platform_device *pdev)
>
> ddr2_reg_base = pdata->ddr2_ctlr_base;
>
> - /* Wait for interrupt state */
> - driver->states[0].enter = davinci_enter_idle;
> - driver->states[0].exit_latency = 1;
> - driver->states[0].target_residency = 10000;
> - driver->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
> - strcpy(driver->states[0].name, "WFI");
> - strcpy(driver->states[0].desc, "Wait for interrupt");
> -
> - /* Wait for interrupt and DDR self refresh state */
> - driver->states[1].enter = davinci_enter_idle;
> - driver->states[1].exit_latency = 10;
> - driver->states[1].target_residency = 10000;
> - driver->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
> - strcpy(driver->states[1].name, "DDR SR");
> - strcpy(driver->states[1].desc, "WFI and DDR Self Refresh");
> if (pdata->ddr2_pdown)
> davinci_states[1].flags |= DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN;
> cpuidle_set_statedata(&device->states_usage[1], &davinci_states[1]);
>
> device->state_count = DAVINCI_CPUIDLE_MAX_STATES;
> - driver->state_count = DAVINCI_CPUIDLE_MAX_STATES;
>
> ret = cpuidle_register_driver(&davinci_idle_driver);
> if (ret) {
> --
> 1.7.9.4
>
--
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