Re: [PATCH v7 00/10] drm/amd/display: Use drm_edid for more code

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Hi Mario and Melissa,

There are three regressions identified during the test, and improvement is required before the patches can be merged. Please see details below.

1. null pointer when hot-plugging a dsc hub (+ three 4k60 monitors).

This may point to "drm/amd/display: use drm_edid_product_id for parsing EDID product info" since that's the only patch calling drm_edid_get_product_id.


[  227.797361] RIP: 0010:drm_edid_get_product_id+0x1d/0x50 [drm]
[ 227.797388] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 e5 48 85 ff 74 24 48 8b 47 08 48 85 c0 74 1b 48 83 3f 7f 76 15 <48> 8b 50 08 5d 48 89 16 0f b7 40 10 66 89 46 08 e9 a9 47 ee ce 31
[  227.797391] RSP: 0018:ffffac58126f7930 EFLAGS: 00010216
[ 227.797394] RAX: 000000000000372d RBX: ffff8eaeaf8ac808 RCX: ffff8eaeaf8ac107 [ 227.797396] RDX: 0000000000000002 RSI: ffffac58126f7944 RDI: ffff8eaeeeaf9f80 [ 227.797398] RBP: ffffac58126f7930 R08: ffff8eae8e500d00 R09: 0000000000000001 [ 227.797400] R10: ffffac58126f7978 R11: 000000000017f81b R12: ffff8eae84cb0000 [ 227.797402] R13: ffff8eaeeeaf9f80 R14: 0000000000000000 R15: 0000000000000100 [ 227.797405] FS: 00007f031a616ac0(0000) GS:ffff8eb57cd80000(0000) knlGS:0000000000000000
[  227.797407] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 227.797409] CR2: 0000000000003735 CR3: 000000014decc000 CR4: 0000000000750ef0
[  227.797411] PKRU: 55555554
[  227.797413] Call Trace:
[  227.797415]  <TASK>
[  227.797417]  ? show_regs+0x64/0x70
[  227.797423]  ? __die+0x24/0x70
[  227.797427]  ? page_fault_oops+0x160/0x520
[  227.797435]  ? do_user_addr_fault+0x2e9/0x6a0
[  227.797438]  ? dc_link_add_remote_sink+0x20/0x30 [amdgpu]
[  227.797654]  ? dm_dp_mst_get_modes+0xee/0x520 [amdgpu]
[ 227.797882] ? drm_helper_probe_single_connector_modes+0x1b5/0x670 [drm_kms_helper]
[  227.797894]  ? exc_page_fault+0x7f/0x190
[  227.797899]  ? asm_exc_page_fault+0x27/0x30
[  227.797906]  ? drm_edid_get_product_id+0x1d/0x50 [drm]
[  227.797932]  dm_helpers_parse_edid_caps+0x69/0x260 [amdgpu]
[ 227.798139] amdgpu 0000:0b:00.0: [drm:drm_dp_dpcd_write [drm_display_helper]] AMDGPU DM aux hw bus 2: 0x02003 AUX <- (ret= 1) 10
[  227.798158]  link_add_remote_sink+0xa8/0x1a0 [amdgpu]
[  227.798402]  dc_link_add_remote_sink+0x20/0x30 [amdgpu]
[  227.798615]  dm_dp_mst_get_modes+0xee/0x520 [amdgpu]
[  227.798843]  ? srso_alias_return_thunk+0x5/0xfbef5
[ 227.798848] drm_helper_probe_single_connector_modes+0x1b5/0x670 [drm_kms_helper]


2. DP2 Display is not listed as an audio device

Steps to reproduce:
- Attach display to system.
- Boot to Desktop (Wayland)
- Attempt to select display as an audio device.

This points to patch "drm/amd/display: get SAD from drm_eld when parsing EDID caps"


3. IGT amd_mem_leak'sconnector-suspend-resume fails on Navi 31.

This points to the patch "drm/amd/display: remove dc_edid handler from dm_helpers_parse_edid_caps".


Using IGT_SRANDOM=1727192429 for randomisation
Opened device: /dev/dri/card0
Starting subtest: connector-suspend-resume
[cmd] rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Sep 24 15:40:50 2024
unreferenced object 0xffff95c683517b00 (size 256):
  comm "kworker/u64:30", pid 3636, jiffies 4295452761
  hex dump (first 32 bytes):
    00 ff ff ff ff ff ff 00 22 0e c2 36 00 00 00 00  ........"..6....
    33 1d 01 04 b5 3c 22 78 3b 28 91 a7 55 4e a3 26  3....<"x;(..UN.&
  backtrace (crc 5800a91d):
    [<ffffffffbb73502a>] kmemleak_alloc+0x4a/0x80
    [<ffffffffbabbde07>] kmalloc_node_track_caller_noprof+0x337/0x410
    [<ffffffffbab631f8>] krealloc_noprof+0x58/0xb0
    [<ffffffffc04e8e38>] _drm_do_get_edid+0x138/0x410 [drm]
    [<ffffffffc04e9155>] drm_edid_read_custom+0x35/0xd0 [drm]
    [<ffffffffc04e9244>] drm_edid_read_ddc+0x44/0x80 [drm]
    [<ffffffffc1061808>] dm_helpers_read_local_edid+0x1d8/0x340 [amdgpu]
    [<ffffffffc11b7446>] detect_link_and_local_sink+0x356/0x1230 [amdgpu]
    [<ffffffffc11b8366>] link_detect+0x36/0x4f0 [amdgpu]
    [<ffffffffc13667a0>] dc_link_detect+0x20/0x30 [amdgpu]
    [<ffffffffc10536f0>] dm_resume+0x1e0/0x7d0 [amdgpu]
    [<ffffffffc0d25908>] amdgpu_device_ip_resume_phase2+0x58/0xd0 [amdgpu]
    [<ffffffffc0d29cb7>] amdgpu_device_resume+0xa7/0x2e0 [amdgpu]
    [<ffffffffc0d2467c>] amdgpu_pmops_resume+0x4c/0x90 [amdgpu]
    [<ffffffffbb02e121>] pci_pm_resume+0x71/0x100
    [<ffffffffbb22c551>] dpm_run_callback+0x91/0x1e0
unreferenced object 0xffff95c6c58dd0c0 (size 16):
  comm "kworker/u64:30", pid 3636, jiffies 4295452764
  hex dump (first 16 bytes):
    00 01 00 00 00 00 00 00 00 7b 51 83 c6 95 ff ff  .........{Q.....
  backtrace (crc 70d89717):
    [<ffffffffbb73502a>] kmemleak_alloc+0x4a/0x80
    [<ffffffffbabbbf3e>] kmalloc_trace_noprof+0x28e/0x300
    [<ffffffffc04e6845>] _drm_edid_alloc+0x35/0x60 [drm]
    [<ffffffffc04e9175>] drm_edid_read_custom+0x55/0xd0 [drm]
    [<ffffffffc04e9244>] drm_edid_read_ddc+0x44/0x80 [drm]
    [<ffffffffc1061808>] dm_helpers_read_local_edid+0x1d8/0x340 [amdgpu]
    [<ffffffffc11b7446>] detect_link_and_local_sink+0x356/0x1230 [amdgpu]
    [<ffffffffc11b8366>] link_detect+0x36/0x4f0 [amdgpu]
    [<ffffffffc13667a0>] dc_link_detect+0x20/0x30 [amdgpu]
    [<ffffffffc10536f0>] dm_resume+0x1e0/0x7d0 [amdgpu]
    [<ffffffffc0d25908>] amdgpu_device_ip_resume_phase2+0x58/0xd0 [amdgpu]
    [<ffffffffc0d29cb7>] amdgpu_device_resume+0xa7/0x2e0 [amdgpu]
    [<ffffffffc0d2467c>] amdgpu_pmops_resume+0x4c/0x90 [amdgpu]
    [<ffffffffbb02e121>] pci_pm_resume+0x71/0x100
    [<ffffffffbb22c551>] dpm_run_callback+0x91/0x1e0
    [<ffffffffbb22ca76>] device_resume+0xb6/0x2c0
Stack trace:
  #0 ../lib/igt_core.c:2051 __igt_fail_assert()
  #1 ../tests/amdgpu/amd_mem_leak.c:202 __igt_unique____real_main208()
  #2 ../tests/amdgpu/amd_mem_leak.c:208 main()
  #3 ../sysdeps/nptl/libc_start_call_main.h:74 __libc_start_call_main()
  #4 ../csu/libc-start.c:128 __libc_start_main@@GLIBC_2.34()
  #5 [_start+0x25]
Subtest connector-suspend-resume: FAIL (9.535s)

On 9/18/24 15:38, Mario Limonciello wrote:
This is the successor of Melissa's v5 series that was posted [1] as well
as my series that was posted [2].

Melissa's patches are mostly unmodified from v5, but the series has been
rebase on the new 6.10 based amd-staging-drm-next.

As were both touching similar code for fetching the EDID, I've merged the
pertinent parts of my series into this one in allowing the connector to
fetch the EDID from _DDC if available for eDP as well.

There are still some remaining uses of drm_edid_raw() but they touch pure
DC code, so a wrapper or macro will probably be needed to convert them.
This can be for follow ups later on.

Link: https://lore.kernel.org/amd-gfx/20240807203207.2830-1-mwen@xxxxxxxxxx/ [1]
Link: https://lore.kernel.org/dri-devel/20240214215756.6530-1-mario.limonciello@xxxxxxx/ [2]

v7:
  * Rebase on amd-staging-drm-next which is now 6.10 based
  * Fix the two LKP robot reported issues

Mario Limonciello (1):
   drm/amd/display: Fetch the EDID from _DDC if available for eDP

Melissa Wen (9):
   drm/amd/display: switch amdgpu_dm_connector to use struct drm_edid
   drm/amd/display: switch to setting physical address directly
   drm/amd/display: always call connector_update when parsing
     freesync_caps
   drm/amd/display: remove redundant freesync parser for DP
   drm/amd/display: use drm_edid_product_id for parsing EDID product info
   drm/amd/display: parse display name from drm_eld
   drm/amd/display: get SAD from drm_eld when parsing EDID caps
   drm/amd/display: get SADB from drm_eld when parsing EDID caps
   drm/amd/display: remove dc_edid handler from
     dm_helpers_parse_edid_caps

  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 200 ++++++------------
  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |   4 +-
  .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 172 +++++++++------
  .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  34 +--
  drivers/gpu/drm/amd/display/dc/dm_helpers.h   |   1 -
  .../drm/amd/display/dc/link/link_detection.c  |   6 +-
  drivers/gpu/drm/amd/include/amd_shared.h      |   5 +
  7 files changed, 200 insertions(+), 222 deletions(-)


base-commit: 0569603f945225067d963c8ba4fda31d967ab584




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