于 2019年10月7日 GMT+08:00 下午7:51:48, Maxime Ripard mripard@kernel.org 写到:
On Mon, Oct 07, 2019 at 12:03:00AM +0800, Icenowy Zheng wrote:
From: Jagan Teki jagan@amarulasolutions.com
The LCD timing definitions between Linux DRM vs Allwinner are
different,
below diagram shows this clear differences.
Active Front Sync Back Region PorchPorch
<-----------------------><----------------><--------------><-------------->
//////////////////////| ////////////////////// | ////////////////////// |..................
................
________________<----- [hv]display -----> <------------- [hv]sync_start ------------> <--------------------- [hv]sync_end ----------------------> <-------------------------------- [hv]total
------------------------------>
<----- lcd_[xy] --------> <- lcd_[hv]spw -> <---------- lcd_[hv]bp ---------> <-------------------------------- lcd_[hv]t
------------------------------>
The DSI driver misinterpreted the vbp term from the BSP code to refer only to the backporch, when in fact it was backporch + sync. Thus the driver incorrectly used the vertical front porch plus sync in its calculation of the DRQ set bit value, when it should not have
included
the sync timing.
Including additional sync timings leads to flip_done timed out as:
WARNING: CPU: 0 PID: 31 at drivers/gpu/drm/drm_atomic_helper.c:1429
drm_atomic_helper_wait_for_vblanks.part.1+0x298/0x2a0
[CRTC:46:crtc-0] vblank wait timed out Modules linked in: CPU: 0 PID: 31 Comm: kworker/0:1 Not tainted
5.1.0-next-20190514-00029-g09e5b0ed0a58 #18
Hardware name: Allwinner sun8i Family Workqueue: events deferred_probe_work_func [<c010ed54>] (unwind_backtrace) from [<c010b76c>]
(show_stack+0x10/0x14)
[<c010b76c>] (show_stack) from [<c0688c70>] (dump_stack+0x84/0x98) [<c0688c70>] (dump_stack) from [<c011d9e4>] (__warn+0xfc/0x114) [<c011d9e4>] (__warn) from [<c011da40>] (warn_slowpath_fmt+0x44/0x68) [<c011da40>] (warn_slowpath_fmt) from [<c040cd50>]
(drm_atomic_helper_wait_for_vblanks.part.1+0x298/0x2a0)
[<c040cd50>] (drm_atomic_helper_wait_for_vblanks.part.1) from
[<c040e694>] (drm_atomic_helper_commit_tail_rpm+0x5c/0x6c)
[<c040e694>] (drm_atomic_helper_commit_tail_rpm) from [<c040e4dc>]
(commit_tail+0x40/0x6c)
[<c040e4dc>] (commit_tail) from [<c040e5cc>]
(drm_atomic_helper_commit+0xbc/0x128)
[<c040e5cc>] (drm_atomic_helper_commit) from [<c0411b64>]
(restore_fbdev_mode_atomic+0x1cc/0x1dc)
[<c0411b64>] (restore_fbdev_mode_atomic) from [<c04156f8>]
(drm_fb_helper_restore_fbdev_mode_unlocked+0x54/0xa0)
[<c04156f8>] (drm_fb_helper_restore_fbdev_mode_unlocked) from
[<c0415774>] (drm_fb_helper_set_par+0x30/0x54)
[<c0415774>] (drm_fb_helper_set_par) from [<c03ad450>]
(fbcon_init+0x560/0x5ac)
[<c03ad450>] (fbcon_init) from [<c03eb8a0>] (visual_init+0xbc/0x104) [<c03eb8a0>] (visual_init) from [<c03ed1b8>]
(do_bind_con_driver+0x1b0/0x390)
[<c03ed1b8>] (do_bind_con_driver) from [<c03ed780>]
(do_take_over_console+0x13c/0x1c4)
[<c03ed780>] (do_take_over_console) from [<c03ad800>]
(do_fbcon_takeover+0x74/0xcc)
[<c03ad800>] (do_fbcon_takeover) from [<c013c9c8>]
(notifier_call_chain+0x44/0x84)
[<c013c9c8>] (notifier_call_chain) from [<c013cd20>]
(__blocking_notifier_call_chain+0x48/0x60)
[<c013cd20>] (__blocking_notifier_call_chain) from [<c013cd50>]
(blocking_notifier_call_chain+0x18/0x20)
[<c013cd50>] (blocking_notifier_call_chain) from [<c03a6e44>]
(register_framebuffer+0x1e0/0x2f8)
[<c03a6e44>] (register_framebuffer) from [<c04153c0>]
(__drm_fb_helper_initial_config_and_unlock+0x2fc/0x50c)
[<c04153c0>] (__drm_fb_helper_initial_config_and_unlock) from
[<c04158c8>] (drm_fbdev_client_hotplug+0xe8/0x1b8)
[<c04158c8>] (drm_fbdev_client_hotplug) from [<c0415a20>]
(drm_fbdev_generic_setup+0x88/0x118)
[<c0415a20>] (drm_fbdev_generic_setup) from [<c043f060>]
(sun4i_drv_bind+0x128/0x160)
[<c043f060>] (sun4i_drv_bind) from [<c044b598>]
(try_to_bring_up_master+0x164/0x1a0)
[<c044b598>] (try_to_bring_up_master) from [<c044b668>]
(__component_add+0x94/0x140)
[<c044b668>] (__component_add) from [<c0445e1c>]
(sun6i_dsi_probe+0x144/0x234)
[<c0445e1c>] (sun6i_dsi_probe) from [<c0452ef4>]
(platform_drv_probe+0x48/0x9c)
[<c0452ef4>] (platform_drv_probe) from [<c04512cc>]
(really_probe+0x1dc/0x2c8)
[<c04512cc>] (really_probe) from [<c0451518>]
(driver_probe_device+0x60/0x160)
[<c0451518>] (driver_probe_device) from [<c044f7a4>]
(bus_for_each_drv+0x74/0xb8)
[<c044f7a4>] (bus_for_each_drv) from [<c045107c>]
(__device_attach+0xd0/0x13c)
[<c045107c>] (__device_attach) from [<c0450474>]
(bus_probe_device+0x84/0x8c)
[<c0450474>] (bus_probe_device) from [<c0450900>]
(deferred_probe_work_func+0x64/0x90)
[<c0450900>] (deferred_probe_work_func) from [<c0135970>]
(process_one_work+0x204/0x420)
[<c0135970>] (process_one_work) from [<c013690c>]
(worker_thread+0x274/0x5a0)
[<c013690c>] (worker_thread) from [<c013b3d8>] (kthread+0x11c/0x14c) [<c013b3d8>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c) Exception stack(0xde539fb0 to 0xde539ff8) 9fa0: 00000000 00000000 00000000
00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 ---[ end trace 495200a78b24980e ]--- random: fast init done [drm:drm_atomic_helper_wait_for_dependencies] *ERROR*
[CRTC:46:crtc-0] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies] *ERROR*
[CONNECTOR:48:DSI-1] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies] *ERROR*
[PLANE:30:plane-0] flip_done timed out
With the terms(as described in above diagram) fixed, the panel displays correctly without any timeouts.
Tested-by: Merlijn Wajer merlijn@wizzup.org Signed-off-by: Jagan Teki jagan@amarulasolutions.com
you should have your SoB here.
All the patches look fine, so there's no need to resend a new version. I'll add it if you can give it.
Sorry, I forgot it.
Signed-off-by: Icenowy Zheng icenowy@aosc.io
Maxime