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Rodrigo Siqueira 47721e8ff0 drm/amd/display: Stop if retimer is not available 
[ Upstream commit a0e40018dc ]

Raven provides retimer feature support that requires i2c interaction in
order to make it work well, all settings required for this configuration
are loaded from the Atom bios which include the i2c address. If the
retimer feature is not available, we should abort the attempt to set
this feature, otherwise, it makes the following line return
I2C_CHANNEL_OPERATION_NO_RESPONSE:

 i2c_success = i2c_write(pipe_ctx, slave_address, buffer, sizeof(buffer));
 ...
 if (!i2c_success)
   ASSERT(i2c_success);

This ends up causing problems with hotplugging HDMI displays on Raven,
and causes retimer settings to warn like so:

WARNING: CPU: 1 PID: 429 at
drivers/gpu/drm/amd/amdgpu/../dal/dc/core/dc_link.c:1998
write_i2c_retimer_setting+0xc2/0x3c0 [amdgpu] Modules linked in:
edac_mce_amd ccp kvm irqbypass binfmt_misc crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel snd_hda_codec_realtek snd_hda_codec_generic
ledtrig_audio snd_hda_codec_hdmi snd_hda_intel amdgpu(+) snd_hda_codec
snd_hda_core snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event
snd_rawmidi aesni_intel snd_seq amd_iommu_v2 gpu_sched aes_x86_64
crypto_simd cryptd glue_helper snd_seq_device ttm drm_kms_helper
snd_timer eeepc_wmi wmi_bmof asus_wmi sparse_keymap drm mxm_wmi snd
k10temp fb_sys_fops syscopyarea sysfillrect sysimgblt soundcore joydev
input_leds mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables
x_tables autofs4 igb i2c_algo_bit hid_generic usbhid i2c_piix4 dca ahci
hid libahci video wmi gpio_amdpt gpio_generic CPU: 1 PID: 429 Comm:
systemd-udevd Tainted: G        W         5.2.0-rc1sept162019+ #1
Hardware name: System manufacturer System Product Name/ROG STRIX B450-F
GAMING, BIOS 2605 08/06/2019
RIP: 0010:write_i2c_retimer_setting+0xc2/0x3c0 [amdgpu]
Code: ff 0f b6 4d ce 44 0f b6 45 cf 44 0f b6 c8 45 89 cf 44 89 e2 48 c7
c6 f0 34 bc c0 bf 04 00 00 00 e8 63 b0 90 ff 45 84 ff 75 02 <0f> 0b 42
0f b6 04 73 8d 50 f6 80 fa 02 77 8c 3c 0a 0f 85 c8 00 00 RSP:
0018:ffffa99d02726fd0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffa99d02727035 RCX: 0000000000000006
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff976acc857440
RBP: ffffa99d02727018 R08: 0000000000000002 R09: 000000000002a600
R10: ffffe90610193680 R11: 00000000000005e3 R12: 000000000000005d
R13: ffff976ac4b201b8 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f14f99e1680(0000) GS:ffff976acc840000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdf212843b8 CR3: 0000000408906000 CR4: 00000000003406e0
Call Trace:
 core_link_enable_stream+0x626/0x680 [amdgpu]
 dce110_apply_ctx_to_hw+0x414/0x4e0 [amdgpu]
 dc_commit_state+0x331/0x5e0 [amdgpu]
 ? drm_calc_timestamping_constants+0xf9/0x150 [drm]
 amdgpu_dm_atomic_commit_tail+0x395/0x1e00 [amdgpu]
 ? dm_plane_helper_prepare_fb+0x20c/0x280 [amdgpu]
 commit_tail+0x42/0x70 [drm_kms_helper]
 drm_atomic_helper_commit+0x10c/0x120 [drm_kms_helper]
 amdgpu_dm_atomic_commit+0x95/0xa0 [amdgpu]
 drm_atomic_commit+0x4a/0x50 [drm]
 restore_fbdev_mode_atomic+0x1c0/0x1e0 [drm_kms_helper]
 restore_fbdev_mode+0x4c/0x160 [drm_kms_helper]
 ? _cond_resched+0x19/0x40
 drm_fb_helper_restore_fbdev_mode_unlocked+0x4e/0xa0 [drm_kms_helper]
 drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
 fbcon_init+0x471/0x630
 visual_init+0xd5/0x130
 do_bind_con_driver+0x20a/0x430
 do_take_over_console+0x7d/0x1b0
 do_fbcon_takeover+0x5c/0xb0
 fbcon_event_notify+0x6cd/0x8a0
 notifier_call_chain+0x4c/0x70
 blocking_notifier_call_chain+0x43/0x60
 fb_notifier_call_chain+0x1b/0x20
 register_framebuffer+0x254/0x360
 __drm_fb_helper_initial_config_and_unlock+0x2c5/0x510 [drm_kms_helper]
 drm_fb_helper_initial_config+0x35/0x40 [drm_kms_helper]
 amdgpu_fbdev_init+0xcd/0x100 [amdgpu]
 amdgpu_device_init+0x1156/0x1930 [amdgpu]
 amdgpu_driver_load_kms+0x8d/0x2e0 [amdgpu]
 drm_dev_register+0x12b/0x1c0 [drm]
 amdgpu_pci_probe+0xd3/0x160 [amdgpu]
 local_pci_probe+0x47/0xa0
 pci_device_probe+0x142/0x1b0
 really_probe+0xf5/0x3d0
 driver_probe_device+0x11b/0x130
 device_driver_attach+0x58/0x60
 __driver_attach+0xa3/0x140
 ? device_driver_attach+0x60/0x60
 ? device_driver_attach+0x60/0x60
 bus_for_each_dev+0x74/0xb0
 ? kmem_cache_alloc_trace+0x1a3/0x1c0
 driver_attach+0x1e/0x20
 bus_add_driver+0x147/0x220
 ? 0xffffffffc0cb9000
 driver_register+0x60/0x100
 ? 0xffffffffc0cb9000
 __pci_register_driver+0x5a/0x60
 amdgpu_init+0x74/0x83 [amdgpu]
 do_one_initcall+0x4a/0x1fa
 ? _cond_resched+0x19/0x40
 ? kmem_cache_alloc_trace+0x3f/0x1c0
 ? __vunmap+0x1cc/0x200
 do_init_module+0x5f/0x227
 load_module+0x2330/0x2b40
 __do_sys_finit_module+0xfc/0x120
 ? __do_sys_finit_module+0xfc/0x120
 __x64_sys_finit_module+0x1a/0x20
 do_syscall_64+0x5a/0x130
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f14f9500839
Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89
f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d 1f f6 2c 00 f7 d8 64 89 01 48
RSP: 002b:00007fff9bc4f5a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 000055afb5abce30 RCX: 00007f14f9500839
RDX: 0000000000000000 RSI: 000055afb5ace0f0 RDI: 0000000000000017
RBP: 000055afb5ace0f0 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000017 R11: 0000000000000246 R12: 0000000000000000
R13: 000055afb5aad800 R14: 0000000000020000 R15: 0000000000000000
---[ end trace c286e96563966f08 ]---

This commit reworks the way that we handle i2c write for retimer in the
way that we abort this configuration if the feature is not available in
the device. For debug sake, we kept a simple log message in case the
retimer is not available.

Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-10-01 13:14:36 +02:00
arch x86/pkeys: Add check for pkey "overflow" 2020-10-01 13:14:34 +02:00
block block: ensure bdi->io_pages is always initialized 2020-09-12 13:40:22 +02:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock() 2020-07-09 09:37:10 +02:00
Documentation kbuild: support LLVM=1 to switch the default tools to Clang/LLVM 2020-09-26 18:01:32 +02:00
drivers drm/amd/display: Stop if retimer is not available 2020-10-01 13:14:36 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs ext4: fix a data race at inode->i_disksize 2020-10-01 13:14:36 +02:00
include skbuff: fix a data race in skb_queue_len() 2020-10-01 13:14:32 +02:00
init printk: queue wake_up_klogd irq_work only if per-CPU areas are ready 2020-07-22 09:32:13 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:18:40 +02:00
kernel timekeeping: Prevent 32bit truncation in scale64_check_overflow() 2020-10-01 13:14:36 +02:00
lib lib/string.c: implement stpcpy 2020-10-01 13:14:25 +02:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm mm: avoid data corruption on CoW fault into PFN-mapped VMA 2020-10-01 13:14:36 +02:00
net Bluetooth: guard against controllers sending zero'd events 2020-10-01 13:14:35 +02:00
samples samples: bpf: Fix build error 2020-06-03 08:19:31 +02:00
scripts checkpatch: fix the usage of capture group ( ... ) 2020-09-09 19:04:32 +02:00
security selinux: sel_avc_get_stat_idx should increase position index 2020-10-01 13:14:33 +02:00
sound ALSA: usb-audio: Don't create a mixer element with bogus volume range 2020-10-01 13:14:34 +02:00
tools perf jevents: Fix leak of mapfile memory 2020-10-01 13:14:36 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: fix overflow of zero page refcount with ksm running 2020-10-01 13:14:32 +02:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS Documentation/llvm: add documentation on building w/ Clang/LLVM 2020-09-26 18:01:31 +02:00
Makefile Linux 4.19.148 2020-09-26 18:01:33 +02:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.