On 08/03/2016 08:09 AM, Daniel Vetter wrote:
On Wed, Aug 03, 2016 at 01:07:12PM +1000, Dave Airlie wrote:
On 6 July 2016 at 20:05, Mario Kleiner <mario.kleiner.de@xxxxxxxxx> wrote:
For DP sinks which don't expose color depth via EDID, use
the drm_dp_sink_bpc() helper to derive the bpc of the sink.
This should handle DP native sinks with the "Assume 6 bpc if EDID
doesn't tell us" as mandated by DP spec. It gives more accurate
values for DP->legacy converters for HDMI, DVI and VGA.
Haswell says no.
Yup indeed, sorry for missing that. Tomeu and Mika Kahola are working on
some fancy new dp helper to probe all that, and as part of that suitably
fill out connector->display_info, too. That would allow both the
inversion, and the dpcd transaction from within atomic_check (which is
kinda not that cool either).
-Daniel
Ups, sorry. They were only successfully tested with Ironlake and
Ivybridge, non-MST, all the Intel hw i have here.
Anyway, patches 1+2 and 5 are independent of those and will fix existing
bugs and regressions in stable kernels. Patch 1 fixes what the commit
reverted in patch 2 was fixing. Patch 2 fixes the DP->legacy regressions
which affect my users, patch 5 adds robustness for DVI sinks in general,
making full use of EDID 1.3 info.
Maybe the logic in patch 3 can be somehow useful for Tomeu and Mika, as
it was tested with different dp -> xx adapters. Happy to review or test
once they have stuff ready.
thanks,
-mario
ug 03 12:58:46 tyrion-bne-redhat-com kernel: fbcon: inteldrmfb (fb0)
is primary device
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: BUG: unable to handle
kernel NULL pointer dereference at 000000000000011b
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: IP: [<ffffffffa00e6cf5>]
drm_dp_sink_bpc+0x5/0xb0 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: PGD 0
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Oops: 0000 [#1] SMP
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Modules linked in: i915
ccm xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun
ip6t_rpfilter ip6t_
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: videobuf2_core
snd_hda_codec videodev mei_me mei snd_hwdep snd_seq snd_hda_core
rtsx_pci media i2c_i
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: CPU: 1 PID: 752 Comm:
kworker/1:3 Not tainted 4.7.0+ #12
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Hardware name: LENOVO
20ARS25701/20ARS25701, BIOS GJET72WW (2.22 ) 02/21/2014
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Workqueue: events_long
drm_dp_mst_link_probe_work [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: task: ffff880308583a80
task.stack: ffff880309f20000
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RIP:
0010:[<ffffffffa00e6cf5>] [<ffffffffa00e6cf5>]
drm_dp_sink_bpc+0x5/0xb0 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RSP:
0018:ffff880309f23b48 EFLAGS: 00010202
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RAX: 000000000000000a
RBX: 0000000000000006 RCX: 0000000000000000
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RDX: 0000000000000000
RSI: 0000000000000127 RDI: 0000000000000116
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RBP: ffff880309f23b50
R08: ffff880309734800 R09: 0000000000000024
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: R10: 0000000000000000
R11: 0000000000000000 R12: ffff880309737800
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: R13: ffff88030a334000
R14: ffff880309737000 R15: ffff880309737800
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: FS:
0000000000000000(0000) GS:ffff88031e240000(0000)
knlGS:0000000000000000
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: CS: 0010 DS: 0000 ES:
0000 CR0: 0000000080050033
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: CR2: 000000000000011b
CR3: 0000000001c06000 CR4: 00000000001406e0
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Stack:
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: ffffffffa09d4295
ffff880309f23bd8 ffffffffa09a7c1f ffffffff8122544d
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: ffff880306660258
ffff880306660000 0000000009737800 ffff88030a331000
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: 0100880300000024
ffff880309f23bb8 ffffffff00000024 ffff880309737800
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Call Trace:
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa09d4295>] ?
intel_dp_sink_bpc+0x25/0x30 [i915]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa09a7c1f>]
intel_atomic_check+0xacf/0x1250 [i915]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff8122544d>] ?
__kmalloc_track_caller+0x12d/0x210
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa0097ea7>]
drm_atomic_check_only+0x187/0x610 [drm]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa0098857>] ?
drm_atomic_add_affected_connectors+0x27/0xf0 [drm]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa0098347>]
drm_atomic_commit+0x17/0x60 [drm]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00f4e0c>]
restore_fbdev_mode+0x14c/0x260 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00f6a23>]
drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00f6a9d>]
drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00f69b8>]
drm_fb_helper_hotplug_event+0x148/0x180 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa09c238a>]
intel_fbdev_output_poll_changed+0x1a/0x20 [i915]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00e79c7>]
drm_kms_helper_hotplug_event+0x27/0x30 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa09cafa5>]
intel_dp_mst_hotplug+0x15/0x20 [i915]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00ee31a>]
drm_dp_send_link_address+0x19a/0x220 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810df553>] ?
put_prev_entity+0x33/0x410
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff8111280b>] ?
add_timer_on+0xdb/0x1b0
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff8102c766>] ?
__switch_to+0x2b6/0x600
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810e361e>] ?
pick_next_task_fair+0x10e/0x4d0
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00ee44d>]
drm_dp_check_and_send_link_address+0xad/0xc0 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00ee4b7>]
drm_dp_mst_link_probe_work+0x57/0xb0 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c086f>]
process_one_work+0x15f/0x410
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c0b6e>]
worker_thread+0x4e/0x480
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c0b20>] ?
process_one_work+0x410/0x410
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c0b20>] ?
process_one_work+0x410/0x410
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c64c8>]
kthread+0xd8/0xf0
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff817d527f>]
ret_from_fork+0x1f/0x40
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c63f0>] ?
kthread_worker_fn+0x170/0x170
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Code: b8 b0 1e 04 00 48
89 e5 74 11 40 80 ff 14 ba d0 78 02 00 b8 60 3d 08 00 0f 45 c2 5d c3
66 0f 1f
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RIP
[<ffffffffa00e6cf5>] drm_dp_sink_bpc+0x5/0xb0 [drm_kms_helper]
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RSP <ffff880309f23b48>
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: CR2: 000000000000011b
Aug 03 12:58:46 tyrion-bne-redhat-com kernel: ---[ end trace
d3270996301ba013 ]---
Possibly MST related.
Dave.
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