From: Rob Lee <rob.lee@linaro.org>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: kernel@pengutronix.de, shawn.guo@linaro.org,
amit.kucheria@linaro.org, daniel.lezcano@linaro.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linaro-dev@lists.linaro.org,
patches@linaro.org, jj@chaosbits.net
Subject: Re: [PATCH v2 2/3] ARM: imx: Add imx5 cpuidle driver
Date: Wed, 2 May 2012 15:11:35 -0500 [thread overview]
Message-ID: <CAMXH7KE1jao1p5ZQ1aw8p7qzOQUftck22QTMKJ1oGwiPhY=FMA@mail.gmail.com> (raw)
In-Reply-To: <20120502073331.GS4141@pengutronix.de>
Sascha,
On Wed, May 2, 2012 at 2:33 AM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> On Tue, May 01, 2012 at 09:12:39PM -0500, Robert Lee wrote:
>> Add imx5 cpuidle driver.
>>
>> Signed-off-by: Robert Lee <rob.lee@linaro.org>
>> ---
>> arch/arm/mach-imx/mm-imx5.c | 42 +++++++++++++++++++++++++++++++++++++++---
>> 1 file changed, 39 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/mach-imx/mm-imx5.c b/arch/arm/mach-imx/mm-imx5.c
>> index d6b7e9f..cbd9bad 100644
>> --- a/arch/arm/mach-imx/mm-imx5.c
>> +++ b/arch/arm/mach-imx/mm-imx5.c
>> @@ -22,24 +22,59 @@
>> #include <mach/common.h>
>> #include <mach/devices-common.h>
>> #include <mach/iomux-v3.h>
>> +#include <mach/cpuidle.h>
>>
>> static struct clk *gpc_dvfs_clk;
>>
>> -static void imx5_idle(void)
>> +static int imx5_idle(void)
>> {
>> + int ret = 0;
>> +
>> /* gpc clock is needed for SRPG */
>> if (gpc_dvfs_clk == NULL) {
>> gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
>> if (IS_ERR(gpc_dvfs_clk))
>> - return;
>> + return -ENODEV;
>> }
>> clk_enable(gpc_dvfs_clk);
>> mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
>> if (!tzic_enable_wake())
>> cpu_do_idle();
>> + else
>> + ret = -EBUSY;
>> clk_disable(gpc_dvfs_clk);
>> +
>> + return ret;
>> +}
>> +
>> +static int imx5_cpuidle_enter(struct cpuidle_device *dev,
>> + struct cpuidle_driver *drv, int idx)
>> +{
>> + int ret;
>> +
>> + ret = imx5_idle();
>> +
>> + if (ret < 0)
>> + return ret;
>> +
>> + return idx;
>> }
>>
>> +static struct cpuidle_driver imx5_cpuidle_driver = {
>> + .name = "imx5_cpuidle",
>> + .owner = THIS_MODULE,
>> + .en_core_tk_irqen = 1,
>> + .states[0] = {
>> + .enter = imx5_cpuidle_enter,
>> + .exit_latency = 20, /* max latency at 160MHz */
>> + .target_residency = 1,
>> + .flags = CPUIDLE_FLAG_TIME_VALID,
>> + .name = "IMX5 SRPG",
>> + .desc = "CPU state retained,powered off",
>> + },
>> + .state_count = 1,
>> +};
>> +
>> /*
>> * Define the MX50 memory map.
>> */
>> @@ -103,7 +138,7 @@ void __init imx51_init_early(void)
>> mxc_set_cpu_type(MXC_CPU_MX51);
>> mxc_iomux_v3_init(MX51_IO_ADDRESS(MX51_IOMUXC_BASE_ADDR));
>> mxc_arch_reset_init(MX51_IO_ADDRESS(MX51_WDOG1_BASE_ADDR));
>> - arm_pm_idle = imx5_idle;
>> + arm_pm_idle = (void *)imx5_idle;
>
> I don't like this. It will cover all warnings when the prototype of
> arm_pm_idle changes in future. Better add a static void imx5_idle
> which calls a static int imx5_do_idle, then you have an idle function
> which returns an int.
>
What about using the following:
arm_pm_idle = (void (*)(void))imx5_idle;
This will give warnings if arm_pm_idle prototype changes.
Thanks,
Rob
>> }
>>
>> void __init imx53_init_early(void)
>> @@ -238,4 +273,5 @@ void __init imx53_soc_init(void)
>> void __init imx51_init_late(void)
>> {
>> mx51_neon_fixup();
>> + imx_cpuidle_init(&imx5_cpuidle_driver);
>> }
>> --
>> 1.7.10
>>
>>
>
> --
> Pengutronix e.K. | |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
> Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
next prev parent reply other threads:[~2012-05-02 20:11 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-02 2:12 [PATCH v2 0/3] Add imx cpuidle Robert Lee
2012-05-02 2:12 ` [PATCH v2 1/3] ARM: imx: Add common imx cpuidle init functionality Robert Lee
2012-05-02 3:13 ` Shawn Guo
2012-05-02 13:59 ` Rob Lee
2012-05-02 14:07 ` Shawn Guo
2012-05-02 14:09 ` Rob Lee
2012-05-02 7:27 ` Sascha Hauer
2012-05-02 19:16 ` Rob Lee
2012-05-02 20:21 ` Sascha Hauer
2012-05-02 2:12 ` [PATCH v2 2/3] ARM: imx: Add imx5 cpuidle driver Robert Lee
2012-05-02 7:33 ` Sascha Hauer
2012-05-02 20:11 ` Rob Lee [this message]
2012-05-03 6:39 ` Sascha Hauer
2012-05-02 2:12 ` [PATCH v2 3/3] ARM: imx: Add imx6q " Robert Lee
2012-05-02 3:23 ` Shawn Guo
2012-05-02 13:50 ` Rob Lee
2012-05-02 13:53 ` Shawn Guo
2012-05-02 3:03 ` [PATCH v2 0/3] Add imx cpuidle Shawn Guo
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