From: Andreas Kemnade <andreas@kemnade.info>
To: Tony Lindgren <tony@atomide.com>
Cc: linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
"H . Nikolaus Schaller" <hns@goldelico.com>,
Keerthy <j-keerthy@ti.com>, Ladislav Michl <ladis@linux-mips.org>,
Pavel Machek <pavel@ucw.cz>, Sebastian Reichel <sre@kernel.org>,
Tero Kristo <t-kristo@ti.com>,
Thierry Reding <thierry.reding@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 2/3] bus: ti-sysc: Fix timer handling with drop pm_runtime_irq_safe()
Date: Sat, 26 Jan 2019 19:41:45 +0100 [thread overview]
Message-ID: <20190126194145.2b3484da@aktux> (raw)
In-Reply-To: <20190122175717.13428-3-tony@atomide.com>
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On Tue, 22 Jan 2019 09:57:16 -0800
Tony Lindgren <tony@atomide.com> wrote:
> Commit 84badc5ec5fc ("ARM: dts: omap4: Move l4 child devices to probe
> them with ti-sysc") started producing a warning for pwm-omap-dmtimer:
>
> WARNING: CPU: 0 PID: 77 at drivers/bus/omap_l3_noc.c:147
> l3_interrupt_handler+0x2f8/0x388
> 44000000.ocp:L3 Custom Error: MASTER MPU TARGET L4PER2 (Idle):
> Data Access in Supervisor mode during Functional access
> ...
> __pm_runtime_idle
> omap_dm_timer_disable
> pwm_omap_dmtimer_start
> pwm_omap_dmtimer_enable
> pwm_apply_state
> pwm_vibrator_start
> pwm_vibrator_play_work
>
> This is because the timer that pwm-omap-dmtimer is using is now being
> probed with ti-sysc interconnect target module instead of omap_device
> and the ti-sysc quirk for SYSC_QUIRK_LEGACY_IDLE is not fully
> compatible with what omap_device has been doing.
>
> We could fix this by reverting the timer changes and have the timer
> probe again with omap_device. Or we could add more quirk handling to
> ti-sysc driver. But as these options don't work nicely as longer term
> solutions, let's just make timers probe with ti-sysc without any
> quirks.
>
> To do this, all we need to do is remove quirks for timers for ti-sysc,
> and drop the bogus pm_runtime_irq_safe() flag for timer-ti-dm.
>
> We should not use pm_runtime_irq_safe() anyways for drivers as it will
> take a permanent use count on the parent device blocking the parent
> devices from idling and has been forcing ti-sysc driver to use a
> quirk flag.
>
> Note that we will move the timer data to DEBUG section later on in
> clean-up patches.
>
together with 1/3 it fixes things on pyra.
Tested-By: Andreas Kemnade <andreas@kemnade.info>
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next prev parent reply other threads:[~2019-01-26 18:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-22 17:57 [PATCH 0/3] pwm-omap-dmtimer regression fixes Tony Lindgren
2019-01-22 17:57 ` [PATCH 1/3] clocksource: timer-ti-dm: Fix pwm dmtimer usage of fck reparenting Tony Lindgren
2019-01-26 18:40 ` Andreas Kemnade
2019-01-26 19:30 ` H. Nikolaus Schaller
2019-02-12 9:08 ` Daniel Lezcano
2019-02-12 15:29 ` Tony Lindgren
2019-01-22 17:57 ` [PATCH 2/3] bus: ti-sysc: Fix timer handling with drop pm_runtime_irq_safe() Tony Lindgren
2019-01-26 18:41 ` Andreas Kemnade [this message]
2019-01-26 19:31 ` H. Nikolaus Schaller
2019-01-22 17:57 ` [PATCH 3/3] ARM: dts: Configure clock parent for pwm vibra Tony Lindgren
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