From: Tony Lindgren tony@atomide.com
[ Upstream commit 9bd34c63f5536c490c152833c77fa47f59aeade3 ]
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.
Fixes: 84badc5ec5fc ("ARM: dts: omap4: Move l4 child devices to probe them with ti-sysc") Cc: Andy Shevchenko andy.shevchenko@gmail.com Cc: Bartosz Golaszewski bgolaszewski@baylibre.com Cc: Daniel Lezcano daniel.lezcano@linaro.org Cc: H. Nikolaus Schaller hns@goldelico.com Cc: Keerthy j-keerthy@ti.com Cc: Ladislav Michl ladis@linux-mips.org Cc: Pavel Machek pavel@ucw.cz Cc: Sebastian Reichel sre@kernel.org Cc: Tero Kristo t-kristo@ti.com Cc: Thierry Reding thierry.reding@gmail.com Cc: Thomas Gleixner tglx@linutronix.de Reported-by: H. Nikolaus Schaller hns@goldelico.com Tested-By: Andreas Kemnade andreas@kemnade.info Tested-By: H. Nikolaus Schaller hns@goldelico.com Signed-off-by: Tony Lindgren tony@atomide.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/bus/ti-sysc.c | 4 ++-- drivers/clocksource/timer-ti-dm.c | 1 - 2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 926c83398b27..2813f9ed57c0 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -888,10 +888,10 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = { SYSC_QUIRK("smartreflex", 0, -1, 0x38, -1, 0x00000000, 0xffffffff, SYSC_QUIRK_LEGACY_IDLE), SYSC_QUIRK("timer", 0, 0, 0x10, 0x14, 0x00000015, 0xffffffff, - SYSC_QUIRK_LEGACY_IDLE), + 0), /* Some timers on omap4 and later */ SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x4fff1301, 0xffffffff, - SYSC_QUIRK_LEGACY_IDLE), + 0), SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff, SYSC_QUIRK_LEGACY_IDLE), /* Uarts on omap4 and later */ diff --git a/drivers/clocksource/timer-ti-dm.c b/drivers/clocksource/timer-ti-dm.c index 3ecf84706640..23414dddc3ba 100644 --- a/drivers/clocksource/timer-ti-dm.c +++ b/drivers/clocksource/timer-ti-dm.c @@ -868,7 +868,6 @@ static int omap_dm_timer_probe(struct platform_device *pdev) timer->pdev = pdev;
pm_runtime_enable(dev); - pm_runtime_irq_safe(dev);
if (!timer->reserved) { ret = pm_runtime_get_sync(dev);