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Message-ID: <98a9f15d-30ac-47bf-9b93-3aa2c9900f7b@samsung.com>
Date: Thu, 14 Dec 2023 13:13:38 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Andy Yan <andyshrk@....com>, heiko@...ech.de
Cc: devicetree@...r.kernel.org, Sascha Hauer <s.hauer@...gutronix.de>,
chris.obbard@...labora.com, hjc@...k-chips.com,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
kever.yang@...k-chips.com, linux-rockchip@...ts.infradead.org,
robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
Andy Yan <andy.yan@...k-chips.com>,
sebastian.reichel@...labora.com
Subject: Re: [v5,02/16] Revert
"drm/rockchip: vop2: Use regcache_sync() to fix suspend/resume"
Dear All,
On 11.12.2023 12:57, Andy Yan wrote:
> From: Andy Yan <andy.yan@...k-chips.com>
>
> This reverts commit b63a553e8f5aa6574eeb535a551817a93c426d8c.
>
> regcache_sync will try to reload the configuration in regcache to
> hardware, but the registers of 4 Cluster windows and Esmart1/2/3 on
> the upcoming rk3588 can not be set successfully before internal PD
> power on.
>
> Also it's better to keep the hardware register as it is before we really
> enable it.
>
> So let's revert this version, and keep the first version:
> commit afa965a45e01 ("drm/rockchip: vop2: fix suspend/resume")
>
> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
> Reviewed-by: Sascha Hauer <s.hauer@...gutronix.de>
This patch landed in today's linux-next as commit 81a06f1d02e5 ("Revert
"drm/rockchip: vop2: Use regcache_sync() to fix suspend/resume"").
Unfortunately it triggers a following lock dep warning on my Odroid-M1
test board:
========================================================
WARNING: possible irq lock inversion dependency detected
6.7.0-rc3+ #14328 Not tainted
--------------------------------------------------------
swapper/0/0 just changed the state of lock:
ffff0001f3ae2c18
(rockchip_drm_vop2:2723:(&vop2_regmap_config)->lock){-...}-{2:2}, at:
regmap_lock_spinlock+0x18/0x2c
but this lock took another, HARDIRQ-unsafe lock in the past:
(&mt->ma_lock){+.+.}-{2:2}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&mt->ma_lock);
local_irq_disable();
lock(rockchip_drm_vop2:2723:(&vop2_regmap_config)->lock);
lock(&mt->ma_lock);
<Interrupt>
lock(rockchip_drm_vop2:2723:(&vop2_regmap_config)->lock);
*** DEADLOCK ***
no locks held by swapper/0/0.
the shortest dependencies between 2nd lock and 1st lock:
-> (&mt->ma_lock){+.+.}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x1e8/0x318
_raw_spin_lock+0x48/0x60
regcache_maple_exit+0x5c/0xc0
regcache_exit+0x48/0x74
regmap_reinit_cache+0x1c/0xc4
vop2_crtc_atomic_enable+0x86c/0xa0c [rockchipdrm]
drm_atomic_helper_commit_modeset_enables+0xb4/0x26c
drm_atomic_helper_commit_tail_rpm+0x50/0xa0
commit_tail+0xa4/0x18c
drm_atomic_helper_commit+0x19c/0x1b0
drm_atomic_commit+0xa8/0xe0
drm_client_modeset_commit_atomic+0x22c/0x298
drm_client_modeset_commit_locked+0x60/0x1c0
drm_client_modeset_commit+0x30/0x58
__drm_fb_helper_restore_fbdev_mode_unlocked+0xbc/0xfc
drm_fb_helper_set_par+0x30/0x4c
fbcon_init+0x234/0x4c0
visual_init+0xb0/0x108
do_bind_con_driver.isra.0+0x19c/0x394
do_take_over_console+0x144/0x1f0
do_fbcon_takeover+0x6c/0xe4
fbcon_fb_registered+0x1e0/0x1e8
register_framebuffer+0x19c/0x228
__drm_fb_helper_initial_config_and_unlock+0x348/0x4fc
drm_fb_helper_hotplug_event.part.0+0xf0/0x110
drm_fb_helper_hotplug_event+0x38/0x44
drm_fbdev_generic_client_hotplug+0x28/0xd4
drm_client_dev_hotplug+0xcc/0x130
output_poll_execute+0x204/0x23c
process_one_work+0x1ec/0x53c
worker_thread+0x298/0x408
kthread+0x124/0x128
ret_from_fork+0x10/0x20
SOFTIRQ-ON-W at:
lock_acquire+0x1e8/0x318
_raw_spin_lock+0x48/0x60
regcache_maple_exit+0x5c/0xc0
regcache_exit+0x48/0x74
regmap_reinit_cache+0x1c/0xc4
vop2_crtc_atomic_enable+0x86c/0xa0c [rockchipdrm]
drm_atomic_helper_commit_modeset_enables+0xb4/0x26c
drm_atomic_helper_commit_tail_rpm+0x50/0xa0
commit_tail+0xa4/0x18c
drm_atomic_helper_commit+0x19c/0x1b0
drm_atomic_commit+0xa8/0xe0
drm_client_modeset_commit_atomic+0x22c/0x298
drm_client_modeset_commit_locked+0x60/0x1c0
drm_client_modeset_commit+0x30/0x58
__drm_fb_helper_restore_fbdev_mode_unlocked+0xbc/0xfc
drm_fb_helper_set_par+0x30/0x4c
fbcon_init+0x234/0x4c0
visual_init+0xb0/0x108
do_bind_con_driver.isra.0+0x19c/0x394
do_take_over_console+0x144/0x1f0
do_fbcon_takeover+0x6c/0xe4
fbcon_fb_registered+0x1e0/0x1e8
register_framebuffer+0x19c/0x228
__drm_fb_helper_initial_config_and_unlock+0x348/0x4fc
drm_fb_helper_hotplug_event.part.0+0xf0/0x110
drm_fb_helper_hotplug_event+0x38/0x44
drm_fbdev_generic_client_hotplug+0x28/0xd4
drm_client_dev_hotplug+0xcc/0x130
output_poll_execute+0x204/0x23c
process_one_work+0x1ec/0x53c
worker_thread+0x298/0x408
kthread+0x124/0x128
ret_from_fork+0x10/0x20
INITIAL USE at:
lock_acquire+0x1e8/0x318
_raw_spin_lock+0x48/0x60
regcache_maple_exit+0x5c/0xc0
regcache_exit+0x48/0x74
regmap_reinit_cache+0x1c/0xc4
vop2_crtc_atomic_enable+0x86c/0xa0c [rockchipdrm]
drm_atomic_helper_commit_modeset_enables+0xb4/0x26c
drm_atomic_helper_commit_tail_rpm+0x50/0xa0
commit_tail+0xa4/0x18c
drm_atomic_helper_commit+0x19c/0x1b0
drm_atomic_commit+0xa8/0xe0
drm_client_modeset_commit_atomic+0x22c/0x298
drm_client_modeset_commit_locked+0x60/0x1c0
drm_client_modeset_commit+0x30/0x58
__drm_fb_helper_restore_fbdev_mode_unlocked+0xbc/0xfc
drm_fb_helper_set_par+0x30/0x4c
fbcon_init+0x234/0x4c0
visual_init+0xb0/0x108
do_bind_con_driver.isra.0+0x19c/0x394
do_take_over_console+0x144/0x1f0
do_fbcon_takeover+0x6c/0xe4
fbcon_fb_registered+0x1e0/0x1e8
register_framebuffer+0x19c/0x228
__drm_fb_helper_initial_config_and_unlock+0x348/0x4fc
drm_fb_helper_hotplug_event.part.0+0xf0/0x110
drm_fb_helper_hotplug_event+0x38/0x44
drm_fbdev_generic_client_hotplug+0x28/0xd4
drm_client_dev_hotplug+0xcc/0x130
output_poll_execute+0x204/0x23c
process_one_work+0x1ec/0x53c
worker_thread+0x298/0x408
kthread+0x124/0x128
ret_from_fork+0x10/0x20
}
... key at: [<ffff800083de53b0>] __key.0+0x0/0x10
... acquired at:
_raw_spin_lock+0x48/0x60
regcache_maple_write+0x1d8/0x31c
regcache_write+0x6c/0x84
_regmap_read+0x1b4/0x1f4
_regmap_update_bits+0xec/0x134
regmap_field_update_bits_base+0x6c/0xa0
vop2_plane_atomic_update+0x380/0x11d0 [rockchipdrm]
drm_atomic_helper_commit_planes+0xec/0x2a0
drm_atomic_helper_commit_tail_rpm+0x60/0xa0
commit_tail+0xa4/0x18c
drm_atomic_helper_commit+0x19c/0x1b0
drm_atomic_commit+0xa8/0xe0
drm_client_modeset_commit_atomic+0x22c/0x298
drm_client_modeset_commit_locked+0x60/0x1c0
drm_client_modeset_commit+0x30/0x58
__drm_fb_helper_restore_fbdev_mode_unlocked+0xbc/0xfc
drm_fb_helper_set_par+0x30/0x4c
fbcon_init+0x234/0x4c0
visual_init+0xb0/0x108
do_bind_con_driver.isra.0+0x19c/0x394
do_take_over_console+0x144/0x1f0
do_fbcon_takeover+0x6c/0xe4
fbcon_fb_registered+0x1e0/0x1e8
register_framebuffer+0x19c/0x228
__drm_fb_helper_initial_config_and_unlock+0x348/0x4fc
drm_fb_helper_hotplug_event.part.0+0xf0/0x110
drm_fb_helper_hotplug_event+0x38/0x44
drm_fbdev_generic_client_hotplug+0x28/0xd4
drm_client_dev_hotplug+0xcc/0x130
output_poll_execute+0x204/0x23c
process_one_work+0x1ec/0x53c
worker_thread+0x298/0x408
kthread+0x124/0x128
ret_from_fork+0x10/0x20
-> (rockchip_drm_vop2:2723:(&vop2_regmap_config)->lock){-...}-{2:2} {
IN-HARDIRQ-W at:
lock_acquire+0x1e8/0x318
_raw_spin_lock_irqsave+0x60/0x88
regmap_lock_spinlock+0x18/0x2c
regmap_read+0x3c/0x78
vop2_isr+0x84/0x2a4 [rockchipdrm]
__handle_irq_event_percpu+0xb0/0x2d4
handle_irq_event+0x4c/0xb8
handle_fasteoi_irq+0xa4/0x1cc
generic_handle_domain_irq+0x2c/0x44
gic_handle_irq+0x4c/0x110
call_on_irq_stack+0x24/0x4c
do_interrupt_handler+0x80/0x84
el1_interrupt+0x34/0x64
el1h_64_irq_handler+0x18/0x24
el1h_64_irq+0x64/0x68
default_idle_call+0x9c/0x150
do_idle+0x230/0x294
cpu_startup_entry+0x34/0x3c
rest_init+0x100/0x190
arch_post_acpi_subsys_init+0x0/0x8
start_kernel+0x594/0x684
__primary_switched+0xbc/0xc4
INITIAL USE at:
lock_acquire+0x1e8/0x318
_raw_spin_lock_irqsave+0x60/0x88
regmap_lock_spinlock+0x18/0x2c
regmap_write+0x3c/0x78
vop2_crtc_atomic_enable+0x894/0xa0c [rockchipdrm]
drm_atomic_helper_commit_modeset_enables+0xb4/0x26c
drm_atomic_helper_commit_tail_rpm+0x50/0xa0
commit_tail+0xa4/0x18c
drm_atomic_helper_commit+0x19c/0x1b0
drm_atomic_commit+0xa8/0xe0
drm_client_modeset_commit_atomic+0x22c/0x298
drm_client_modeset_commit_locked+0x60/0x1c0
drm_client_modeset_commit+0x30/0x58
__drm_fb_helper_restore_fbdev_mode_unlocked+0xbc/0xfc
drm_fb_helper_set_par+0x30/0x4c
fbcon_init+0x234/0x4c0
visual_init+0xb0/0x108
do_bind_con_driver.isra.0+0x19c/0x394
do_take_over_console+0x144/0x1f0
do_fbcon_takeover+0x6c/0xe4
fbcon_fb_registered+0x1e0/0x1e8
register_framebuffer+0x19c/0x228
__drm_fb_helper_initial_config_and_unlock+0x348/0x4fc
drm_fb_helper_hotplug_event.part.0+0xf0/0x110
drm_fb_helper_hotplug_event+0x38/0x44
drm_fbdev_generic_client_hotplug+0x28/0xd4
drm_client_dev_hotplug+0xcc/0x130
output_poll_execute+0x204/0x23c
process_one_work+0x1ec/0x53c
worker_thread+0x298/0x408
kthread+0x124/0x128
ret_from_fork+0x10/0x20
}
... key at: [<ffff80007c090a18>] _key.6+0x0/0xffffffffffffd5e8
[rockchipdrm]
... acquired at:
__lock_acquire+0xad8/0x20c4
lock_acquire+0x1e8/0x318
_raw_spin_lock_irqsave+0x60/0x88
regmap_lock_spinlock+0x18/0x2c
regmap_read+0x3c/0x78
vop2_isr+0x84/0x2a4 [rockchipdrm]
__handle_irq_event_percpu+0xb0/0x2d4
handle_irq_event+0x4c/0xb8
handle_fasteoi_irq+0xa4/0x1cc
generic_handle_domain_irq+0x2c/0x44
gic_handle_irq+0x4c/0x110
call_on_irq_stack+0x24/0x4c
do_interrupt_handler+0x80/0x84
el1_interrupt+0x34/0x64
el1h_64_irq_handler+0x18/0x24
el1h_64_irq+0x64/0x68
default_idle_call+0x9c/0x150
do_idle+0x230/0x294
cpu_startup_entry+0x34/0x3c
rest_init+0x100/0x190
arch_post_acpi_subsys_init+0x0/0x8
start_kernel+0x594/0x684
__primary_switched+0xbc/0xc4
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.7.0-rc3+ #14328
Hardware name: Hardkernel ODROID-M1 (DT)
Call trace:
dump_backtrace+0x98/0xf0
show_stack+0x18/0x24
dump_stack_lvl+0x60/0xac
dump_stack+0x18/0x24
print_irq_inversion_bug.part.0+0x1ec/0x27c
mark_lock+0x634/0x950
__lock_acquire+0xad8/0x20c4
lock_acquire+0x1e8/0x318
_raw_spin_lock_irqsave+0x60/0x88
regmap_lock_spinlock+0x18/0x2c
regmap_read+0x3c/0x78
vop2_isr+0x84/0x2a4 [rockchipdrm]
__handle_irq_event_percpu+0xb0/0x2d4
handle_irq_event+0x4c/0xb8
handle_fasteoi_irq+0xa4/0x1cc
generic_handle_domain_irq+0x2c/0x44
gic_handle_irq+0x4c/0x110
call_on_irq_stack+0x24/0x4c
do_interrupt_handler+0x80/0x84
el1_interrupt+0x34/0x64
el1h_64_irq_handler+0x18/0x24
el1h_64_irq+0x64/0x68
default_idle_call+0x9c/0x150
do_idle+0x230/0x294
cpu_startup_entry+0x34/0x3c
rest_init+0x100/0x190
arch_post_acpi_subsys_init+0x0/0x8
start_kernel+0x594/0x684
__primary_switched+0xbc/0xc4
Console: switching to colour frame buffer device 240x67
rockchip-drm display-subsystem: [drm] fb0: rockchipdrmfb frame buffer device
Reverting it on top of next-20231214 and resolving a conflict
fixes/hides the above lock dep issue.
> ---
>
> (no changes since v1)
>
> drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> index 312da5783362..57784d0a22a6 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> @@ -217,6 +217,8 @@ struct vop2 {
> struct vop2_win win[];
> };
>
> +static const struct regmap_config vop2_regmap_config;
> +
> static struct vop2_video_port *to_vop2_video_port(struct drm_crtc *crtc)
> {
> return container_of(crtc, struct vop2_video_port, crtc);
> @@ -883,7 +885,11 @@ static void vop2_enable(struct vop2 *vop2)
> return;
> }
>
> - regcache_sync(vop2->map);
> + ret = regmap_reinit_cache(vop2->map, &vop2_regmap_config);
> + if (ret) {
> + drm_err(vop2->drm, "failed to reinit cache: %d\n", ret);
> + return;
> + }
>
> if (vop2->data->soc_id == 3566)
> vop2_writel(vop2, RK3568_OTP_WIN_EN, 1);
> @@ -913,8 +919,6 @@ static void vop2_disable(struct vop2 *vop2)
>
> pm_runtime_put_sync(vop2->dev);
>
> - regcache_mark_dirty(vop2->map);
> -
> clk_disable_unprepare(vop2->aclk);
> clk_disable_unprepare(vop2->hclk);
> }
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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