linux-kernel - Re: [PATCH 1/2] accep/ivpu: PM: remove broken ivpu

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Message-ID: <f8e71b4d-fa25-b86c-eee2-c1f16fe01a7c@quicinc.com>
Date:   Thu, 26 Jan 2023 10:08:30 -0700
From:   Jeffrey Hugo <quic_jhugo@...cinc.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>,
        Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>,
        Oded Gabbay <ogabbay@...nel.org>,
        Krystian Pradzynski <krystian.pradzynski@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
CC:     Arnd Bergmann <arnd@...db.de>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] accep/ivpu: PM: remove broken ivpu_dbg() statements

Subject has a typo: "accep" should be "accel"

On 1/26/2023 9:37 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When CONFIG_PM is disabled, the driver fails to build:
> 
> drivers/accel/ivpu/ivpu_pm.c: In function 'ivpu_rpm_get':
> drivers/accel/ivpu/ivpu_pm.c:240:84: error: 'struct dev_pm_info' has no member named 'usage_count'
>    240 |         ivpu_dbg(vdev, RPM, "rpm_get count %d\n", atomic_read(&vdev->drm.dev->power.usage_count));
>        |                                                                                    ^
> include/linux/dynamic_debug.h:223:29: note: in definition of macro '__dynamic_func_call_cls'
>    223 |                 func(&id, ##__VA_ARGS__);                       \
>        |                             ^~~~~~~~~~~
> include/linux/dynamic_debug.h:249:9: note: in expansion of macro '_dynamic_func_call_cls'
>    249 |         _dynamic_func_call_cls(_DPRINTK_CLASS_DFLT, fmt, func, ##__VA_ARGS__)
>        |         ^~~~~~~~~~~~~~~~~~~~~~
> include/linux/dynamic_debug.h:272:9: note: in expansion of macro '_dynamic_func_call'
>    272 |         _dynamic_func_call(fmt, __dynamic_dev_dbg,              \
>        |         ^~~~~~~~~~~~~~~~~~
> include/linux/dev_printk.h:155:9: note: in expansion of macro 'dynamic_dev_dbg'
>    155 |         dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
>        |         ^~~~~~~~~~~~~~~
> drivers/accel/ivpu/ivpu_drv.h:65:17: note: in expansion of macro 'dev_dbg'
>     65 |                 dev_dbg((vdev)->drm.dev, "[%s] " fmt, #type, ##args);          \
>        |                 ^~~~~~~
> drivers/accel/ivpu/ivpu_pm.c:240:9: note: in expansion of macro 'ivpu_dbg'
>    240 |         ivpu_dbg(vdev, RPM, "rpm_get count %d\n", atomic_read(&vdev->drm.dev->power.usage_count));
>        |         ^~~~~~~~
> 
> It would be possible to rework these statements to only conditionally print
> the reference counter, or to make the driver depend on CONFIG_PM, but my
> impression is that these are not actually needed at all if the driver generally
> works, or they could be put back when required. Just remove all four of these
> to make the driver build in all configurations.
> 
> Fixes: 852be13f3bd3 ("accel/ivpu: Add PM support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/accel/ivpu/ivpu_pm.c | 10 ----------
>   1 file changed, 10 deletions(-)
> 
> diff --git a/drivers/accel/ivpu/ivpu_pm.c b/drivers/accel/ivpu/ivpu_pm.c
> index 553bcbd787b3..a880f1dd857e 100644
> --- a/drivers/accel/ivpu/ivpu_pm.c
> +++ b/drivers/accel/ivpu/ivpu_pm.c
> @@ -237,8 +237,6 @@ int ivpu_rpm_get(struct ivpu_device *vdev)
>   {
>   	int ret;
>   
> -	ivpu_dbg(vdev, RPM, "rpm_get count %d\n", atomic_read(&vdev->drm.dev->power.usage_count));
> -
>   	ret = pm_runtime_resume_and_get(vdev->drm.dev);
>   	if (!drm_WARN_ON(&vdev->drm, ret < 0))
>   		vdev->pm->suspend_reschedule_counter = PM_RESCHEDULE_LIMIT;
> @@ -248,8 +246,6 @@ int ivpu_rpm_get(struct ivpu_device *vdev)
>   
>   void ivpu_rpm_put(struct ivpu_device *vdev)
>   {
> -	ivpu_dbg(vdev, RPM, "rpm_put count %d\n", atomic_read(&vdev->drm.dev->power.usage_count));
> -
>   	pm_runtime_mark_last_busy(vdev->drm.dev);
>   	pm_runtime_put_autosuspend(vdev->drm.dev);
>   }
> @@ -314,16 +310,10 @@ void ivpu_pm_enable(struct ivpu_device *vdev)
>   	pm_runtime_allow(dev);
>   	pm_runtime_mark_last_busy(dev);
>   	pm_runtime_put_autosuspend(dev);
> -
> -	ivpu_dbg(vdev, RPM, "Enable RPM count %d\n", atomic_read(&dev->power.usage_count));
>   }
>   
>   void ivpu_pm_disable(struct ivpu_device *vdev)
>   {
> -	struct device *dev = vdev->drm.dev;
> -
> -	ivpu_dbg(vdev, RPM, "Disable RPM count %d\n", atomic_read(&dev->power.usage_count));
> -
>   	pm_runtime_get_noresume(vdev->drm.dev);
>   	pm_runtime_forbid(vdev->drm.dev);
>   }