4K at 60 YCbCr420 missing mode in usermode
Mike Lothian
mike at fireburn.co.uk
Tue Jun 26 23:08:37 UTC 2018
With the modesetting driver I would see this in my dmesg if it helps:
Jun 27 00:00:38 quark kernel: ------------[ cut here ]------------
Jun 27 00:00:38 quark kernel: kernel BUG at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4797!
Jun 27 00:00:38 quark kernel: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
Jun 27 00:00:38 quark kernel: CPU: 2 PID: 335 Comm: Xorg Tainted: G
W 4.18.0-rc1-agd5f+ #189
Jun 27 00:00:38 quark kernel: Hardware name: System manufacturer System
Product Name/ROG STRIX X470-I GAMING, BIOS 0601 04/19/2018
Jun 27 00:00:38 quark kernel: RIP: 0010:dm_update_crtcs_state+0x45b/0x4e0
Jun 27 00:00:38 quark kernel: Code: ff ff 48 85 db 0f 84 ea fe ff ff 48 c7
44 24 18 00 00 00 00 48 c7 44 24 08 00 00 00 00 48 c7 04 24 00 00 00 00 e9
34 fe ff ff <0f> 0b 48 83 c4 30 b8 ea ff ff ff 5b 5d 41 5c 41 5d 41 5e 41
5f c3
Jun 27 00:00:38 quark kernel: RSP: 0018:ffffc900004fbb08 EFLAGS: 00010246
Jun 27 00:00:38 quark kernel: RAX: ffff880818642401 RBX: ffff88081b354000
RCX: 0000000000000000
Jun 27 00:00:38 quark kernel: RDX: 00000000000022d2 RSI: 00000000000022d2
RDI: ffff880818641800
Jun 27 00:00:38 quark kernel: RBP: ffff880806659f80 R08: 0000000000022ac0
R09: ffffffff815bf644
Jun 27 00:00:38 quark kernel: R10: ffffea0020619000 R11: ffff88083e806e80
R12: 0000000000000000
Jun 27 00:00:38 quark kernel: R13: ffff880818642000 R14: ffff880818646800
R15: ffff88081b360800
Jun 27 00:00:38 quark kernel: FS: 00007f5529f3df80(0000)
GS:ffff88083ec80000(0000) knlGS:0000000000000000
Jun 27 00:00:38 quark kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Jun 27 00:00:38 quark kernel: CR2: 00007fb043f26610 CR3: 0000000811394000
CR4: 00000000003406a0
Jun 27 00:00:38 quark kernel: Call Trace:
Jun 27 00:00:38 quark kernel: ? amdgpu_dm_atomic_check+0x1b7/0x3d0
Jun 27 00:00:38 quark kernel: ? drm_atomic_check_only+0x44d/0x640
Jun 27 00:00:38 quark kernel: ? drm_atomic_set_property+0x6a/0x680
Jun 27 00:00:38 quark kernel: ? drm_mode_atomic_ioctl+0x64c/0x9f0
Jun 27 00:00:38 quark kernel: ? drm_atomic_set_property+0x680/0x680
Jun 27 00:00:38 quark kernel: ? drm_ioctl_kernel+0x9c/0xe0
Jun 27 00:00:38 quark kernel: ? drm_ioctl+0x1e1/0x380
Jun 27 00:00:38 quark kernel: ? drm_atomic_set_property+0x680/0x680
Jun 27 00:00:38 quark kernel: ? __set_current_blocked+0x38/0x50
Jun 27 00:00:38 quark kernel: ? _raw_spin_unlock_irq+0xe/0x20
Jun 27 00:00:38 quark kernel: ? amdgpu_drm_ioctl+0x44/0x80
Jun 27 00:00:38 quark kernel: ? do_vfs_ioctl+0x9f/0x610
Jun 27 00:00:38 quark kernel: ? recalc_sigpending+0x11/0x40
Jun 27 00:00:38 quark kernel: ? _copy_from_user+0x37/0x60
Jun 27 00:00:38 quark kernel: ? ksys_ioctl+0x35/0x70
Jun 27 00:00:38 quark kernel: ? __x64_sys_ioctl+0x11/0x20
Jun 27 00:00:38 quark kernel: ? do_syscall_64+0x43/0xf0
Jun 27 00:00:38 quark kernel: ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
Jun 27 00:00:38 quark kernel: Modules linked in:
Jun 27 00:00:38 quark kernel: ---[ end trace c37f846a2d1ee561 ]---
Jun 27 00:00:38 quark kernel: RIP: 0010:dm_update_crtcs_state+0x45b/0x4e0
Jun 27 00:00:38 quark kernel: Code: ff ff 48 85 db 0f 84 ea fe ff ff 48 c7
44 24 18 00 00 00 00 48 c7 44 24 08 00 00 00 00 48 c7 04 24 00 00 00 00 e9
34 fe ff ff <0f> 0b 48 83 c4 30 b8 ea ff ff ff 5b 5d 41 5c 41 5d 41 5e 41
5f c3
Jun 27 00:00:38 quark kernel: RSP: 0018:ffffc900004fbb08 EFLAGS: 00010246
Jun 27 00:00:38 quark kernel: RAX: ffff880818642401 RBX: ffff88081b354000
RCX: 0000000000000000
Jun 27 00:00:38 quark kernel: RDX: 00000000000022d2 RSI: 00000000000022d2
RDI: ffff880818641800
Jun 27 00:00:38 quark kernel: RBP: ffff880806659f80 R08: 0000000000022ac0
R09: ffffffff815bf644
Jun 27 00:00:38 quark kernel: R10: ffffea0020619000 R11: ffff88083e806e80
R12: 0000000000000000
Jun 27 00:00:38 quark kernel: R13: ffff880818642000 R14: ffff880818646800
R15: ffff88081b360800
Jun 27 00:00:38 quark kernel: FS: 00007f5529f3df80(0000)
GS:ffff88083ec80000(0000) knlGS:0000000000000000
Jun 27 00:00:38 quark kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Jun 27 00:00:38 quark kernel: CR2: 00007fb043f26610 CR3: 0000000811394000
CR4: 00000000003406a0
On Wed, 27 Jun 2018 at 00:06 Mike Lothian <mike at fireburn.co.uk> wrote:
> That patch doesn't work for me on Raven - I'm not sure what the DCE
> version is
>
> On Tue, 26 Jun 2018 at 19:34 Zuo, Jerry <Jerry.Zuo at amd.com> wrote:
>
>> Hi Mike:
>>
>>
>>
>> I’ve got the patch updated by checking ASIC ycbcr_420 capability. It
>> will eliminate the support to any ASIC with DCE version < 112.
>>
>> Please use DCE112 or higher ASIC as well.
>>
>>
>>
>> Regards,
>>
>> Jerry
>>
>>
>>
>> *From:* Zuo, Jerry
>> *Sent:* June 26, 2018 2:15 PM
>> *To:* 'Mike Lothian' <mike at fireburn.co.uk>; Michel Dänzer <
>> michel at daenzer.net>
>> *Cc:* Emil Velikov <emil.l.velikov at gmail.com>; xorg-devel at lists.x.org;
>> Lipski, Mikita <Mikita.Lipski at amd.com>; Wentland, Harry <
>> Harry.Wentland at amd.com>
>> *Subject:* RE: 4K at 60 YCbCr420 missing mode in usermode
>>
>>
>>
>> Hi Mike:
>>
>>
>>
>> It is my bad that I need to check DCE version > 112 to add this flag on.
>> Since I am testing on Vega10, I didn’t realize that. Anything like Carrizo,
>> Fiji doesn’t apply to the ycbcr420_only patch.
>>
>>
>>
>> I’ll get the patch updated soon.
>>
>>
>>
>> Regard,
>>
>> Jerry
>>
>>
>>
>> *From:* Mike Lothian [mailto:mike at fireburn.co.uk <mike at fireburn.co.uk>]
>> *Sent:* June 26, 2018 12:41 PM
>> *To:* Michel Dänzer <michel at daenzer.net>
>> *Cc:* Emil Velikov <emil.l.velikov at gmail.com>; Zuo, Jerry <
>> Jerry.Zuo at amd.com>; xorg-devel at lists.x.org; Lipski, Mikita <
>> Mikita.Lipski at amd.com>; Wentland, Harry <Harry.Wentland at amd.com>
>> *Subject:* Re: 4K at 60 YCbCr420 missing mode in usermode
>>
>>
>>
>> With AMDGPU DDX I'm not seeing 4k at 60Hz with this patch and allowing >8bpc
>>
>>
>>
>> With modesetting X doesn't start and I get the following in dmesg:
>>
>>
>>
>> [ 105.397875] ------------[ cut here ]------------
>>
>> [ 105.397877] kernel BUG at
>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4796!
>>
>> [ 105.397882] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
>>
>> [ 105.397884] CPU: 0 PID: 334 Comm: Xorg Tainted: G W
>> 4.18.0-rc1-agd5f+ #187
>>
>> [ 105.397885] Hardware name: System manufacturer System Product Name/ROG
>> STRIX X470-I GAMING, BIOS 0601 04/19/2018
>>
>> [ 105.397890] RIP: 0010:dm_update_crtcs_state+0x45b/0x4e0
>>
>> [ 105.397890] Code: ff ff 48 85 db 0f 84 ea fe ff ff 48 c7 44 24 18 00
>> 00 00 00 48 c7 44 24 08 00 00 00 00 48 c7 04 24 00 00 00 00 e9 34 fe ff ff
>> <0f> 0b 48 83 c4 30 b8 ea ff ff ff 5b 5d 41 5c 41 5d 41 5e 41 5f c3
>>
>> [ 105.397908] RSP: 0018:ffffc9000063b8f8 EFLAGS: 00010246
>>
>> [ 105.397910] RAX: ffff880819942001 RBX: ffff88081b317000 RCX:
>> 0000000000000000
>>
>> [ 105.397911] RDX: 0000000000007690 RSI: 0000000000007690 RDI:
>> ffff880819943800
>>
>> [ 105.397911] RBP: ffff880805bd0a80 R08: 0000000000022ac0 R09:
>> ffffffff815bf6f4
>>
>> [ 105.397912] R10: ffffea0020665000 R11: ffff88083e806e80 R12:
>> 0000000000000000
>>
>> [ 105.397913] R13: ffff880819942400 R14: ffff880819940400 R15:
>> ffff88081b32e800
>>
>> [ 105.397914] FS: 00007f0374519f80(0000) GS:ffff88083ec00000(0000)
>> knlGS:0000000000000000
>>
>> [ 105.397914] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>
>> [ 105.397915] CR2: 0000561ac61e0e10 CR3: 000000081acc6000 CR4:
>> 00000000003406b0
>>
>> [ 105.397916] Call Trace:
>>
>> [ 105.397920] ? amdgpu_dm_atomic_check+0x1b7/0x3d0
>>
>> [ 105.397922] ? _raw_spin_lock_irqsave+0x12/0x40
>>
>> [ 105.397923] ? _raw_spin_unlock_irqrestore+0xf/0x30
>>
>> [ 105.397926] ? drm_atomic_check_only+0x44d/0x640
>>
>> [ 105.397928] ? drm_atomic_commit+0xe/0x50
>>
>> [ 105.397930] ? restore_fbdev_mode_atomic+0x1b9/0x1d0
>>
>> [ 105.397932] ? drm_fb_helper_restore_fbdev_mode_unlocked+0x40/0x90
>>
>> [ 105.397933] ? drm_fb_helper_set_par+0x24/0x50
>>
>> [ 105.397936] ? fb_set_var+0x20f/0x3e0
>>
>> [ 105.397938] ? sugov_should_update_freq+0x42/0x60
>>
>> [ 105.397940] ? sugov_update_single+0x6e/0x1f0
>>
>> [ 105.397942] ? fbcon_blank+0x246/0x320
>>
>> [ 105.397944] ? try_to_wake_up+0x1f1/0x370
>>
>> [ 105.397948] ? do_unblank_screen+0x96/0x150
>>
>> [ 105.397949] ? vt_ioctl+0x35e/0x10f0
>>
>> [ 105.397952] ? path_parentat.isra.63+0x40/0x80
>>
>> [ 105.397954] ? tty_ioctl+0x217/0x890
>>
>> [ 105.397956] ? do_vfs_ioctl+0x9f/0x610
>>
>> [ 105.397957] ? dput.part.36+0x9a/0x120
>>
>> [ 105.397959] ? __fput+0x11a/0x1e0
>>
>> [ 105.397960] ? ksys_ioctl+0x35/0x70
>>
>> [ 105.397962] ? __x64_sys_ioctl+0x11/0x20
>>
>> [ 105.397963] ? do_syscall_64+0x43/0xf0
>>
>> [ 105.397965] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>
>> [ 105.397966] Modules linked in:
>>
>> [ 105.397967] ---[ end trace 82b2adbb705155c8 ]---
>>
>>
>>
>>
>>
>> On Tue, 26 Jun 2018 at 17:27 Mike Lothian <mike at fireburn.co.uk> wrote:
>>
>> Hi
>>
>>
>>
>> I'm happy to test this when I get home
>>
>>
>>
>> I'm currently reverting that patch that enables >8bit colour to get 60Hz
>> back
>>
>>
>>
>> Cheers
>>
>>
>>
>> Mike
>>
>>
>>
>> On Tue, 26 Jun 2018 at 17:23 Michel Dänzer <michel at daenzer.net> wrote:
>>
>> On 2018-06-26 05:43 PM, Emil Velikov wrote:
>> > Hi Jerry,
>> >
>> > On 25 June 2018 at 22:45, Zuo, Jerry <Jerry.Zuo at amd.com> wrote:
>> >> Hello all:
>> >>
>> >>
>> >>
>> >> We are working on an issue affecting 4K at 60 HDMI display not to light
>> up, but
>> >> only showing up 4K at 30 from:
>> >> https://bugs.freedesktop.org/show_bug.cgi?id=106959 and others.
>> >>
>> >>
>> >>
>> >> Some displays (e.g., ASUS PA328) HDMI port shows YCbCr420 CEA extension
>> >> block with 4K at 60 supported. Such HDMI 4K at 60 is not real HDMI 2.0, but
>> still
>> >> following HDMI 1.4 spec. with maximum TMDS clock of 300MHz instead of
>> >> 600MHz.
>> >>
>> >> To get such 4K at 60 supported, it needs to limit the bandwidth by
>> reducing the
>> >> color space to YCbCr420 only. We’ve already raised YCbCr420 only flag
>> >> (attached patch) from kernel side to pass the mode validation, and
>> expose it
>> >> to user space.
>> >>
>> >>
>> >>
>> >> We think that one of the issues that causes this problem is due to
>> >> usermode pruning the 4K at 60 mode from the modelist (attached
>> Xorg.0.log). It
>> >> seems like when usermode receives all the modes, it doesn't take in
>> account
>> >> the 4K at 60 YCbCr4:2:0 specific mode. In order to pass validation of
>> being
>> >> added to usermode modelist, its pixel clk needs to be divided by 2 so
>> that
>> >> it won't exceed TMDS max physical pixel clk (300MHz). That might
>> explain the
>> >> difference in modes between our usermode and modeset.
>> >>
>> >>
>> >>
>> >> Such YCbCr4:2:0 4K at 60 special mode is marked in DRM by raising a
>> flag
>> >> (y420_vdb_modes) inside connector's display_info which can be seen in
>> >> do_y420vdb_modes(). Usermode could rely on that flag to pick up such
>> mode
>> >> and halve the required pclk to prevent such mode getting pruned out.
>> >>
>> >>
>> >>
>> >> We were hoping for someone helps to look at it from usermode
>> perspective.
>> >> Thanks a lot.
>> >>
>> > Just some observations, while going through some coffee. Take them
>> > with a pinch of salt.
>> >
>> > Currently the kernel edid parser (in drm core) handles the
>> > EXT_VIDEO_DATA_BLOCK_420 extended block.
>> > Additionally, the kernel allows such modes only as the (per connector)
>> > ycbcr_420_allowed bool is set by the driver.
>> >
>> > Quick look shows that it's only enabled by i915 on gen10 && geminilake
>> hardware.
>> >
>> > At the same time, X does it's own fairly partial edid parsing and
>> > doesn't handle any(?) extended blocks.
>> >
>> > One solution is to update the X parser, although it seems like a
>> > endless game of cat and mouse.
>> > IMHO a much better approach is to not use edid codepaths for KMS
>> > drivers (where AMDGPU is one).
>> > On those, the supported modes is advertised by the kernel module via
>> > drmModeGetConnector.
>>
>> We are getting the modes from the kernel; the issue is they are then
>> pruned (presumably by xf86ProbeOutputModes => xf86ValidateModesClocks)
>> due to violating the clock limits, as described by Jerry above.
>>
>>
>> --
>> Earthling Michel Dänzer | http://www.amd.com
>> Libre software enthusiast | Mesa and X developer
>> _______________________________________________
>> xorg-devel at lists.x.org: X.Org development
>> Archives: http://lists.x.org/archives/xorg-devel
>> Info: https://lists.x.org/mailman/listinfo/xorg-devel
>>
>>
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