i915->hotplug.dig_port_work can be queued from intel_hpd_irq_handler
called by IRQ handler or by intel_hpd_trigger_irq called from dp_mst.
Since dp_mst is suspended after irq handler uninstall, a cleaner approach
is to cancel hpd work after intel_dp_mst_suspend, otherwise we risk
use-after-free.
It should fix following WARNINGS:
[283.405824] cpu_latency_qos_update_request called for unknown object
[283.405866] WARNING: CPU: 2 PID: 240 at kernel/power/qos.c:296 cpu_latency_qos_update_request+0x2d/0x100
[283.405912] CPU: 2 PID: 240 Comm: kworker/u64:9 Not tainted 5.18.0-rc6-Patchwork_103738v3-g1672d1c43e43+ #1
[283.405915] Hardware name: Intel Corporation Raptor Lake Client Platform/RPL-S ADP-S DDR5 UDIMM CRB, BIOS RPLSFWI1.R00.2397.A01.2109300731 09/30/2021
[283.405916] Workqueue: i915-dp i915_digport_work_func [i915]
[283.406020] RIP: 0010:cpu_latency_qos_update_request+0x2d/0x100
...
[283.406040] Call Trace:
[283.406041] <TASK>
[283.406044] intel_dp_aux_xfer+0x60e/0x8e0 [i915]
[283.406131] ? finish_swait+0x80/0x80
[283.406139] intel_dp_aux_transfer+0xc5/0x2b0 [i915]
[283.406218] drm_dp_dpcd_access+0x79/0x130 [drm_display_helper]
[283.406227] drm_dp_dpcd_read+0xe2/0xf0 [drm_display_helper]
[283.406233] intel_dp_hpd_pulse+0x134/0x570 [i915]
[283.406308] ? __down_killable+0x70/0x140
[283.406313] i915_digport_work_func+0xba/0x150 [i915]
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/4586
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5558
Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220826141929.189681-2-andrzej.hajda@intel.com
Use a more standard form for the VT version number comments.
One slight oddball case is the dp_max_link_rate that had two
version numbers (216/230) and a platform name (GLK). The
story goes that the field was introduced in the spec in
version 216, along with a note that it's used on CNL+. Later
in version 230 the definition of the bit was changed in
bacakwards incompatible ways and the CNL note disappeard.
For us the original CNL+ note in the header got changed to
to GLK+ when all CNL support was dropped from the codebase.
We do still need (and have) handling for both the 216+ and
the 230+ defintions (parse_bdb_216_dp_max_link_rate() vs.
parse_bdb_230_dp_max_link_rate()).
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220715202044.11153-2-ville.syrjala@linux.intel.com
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
On machins without an i915 opregion the acpi_video driver immediately
probes the ACPI video bus and used to also immediately register
acpi_video# backlight devices when supported.
Once the drm/kms driver then loaded later and possibly registered
a native backlight device then the drivers/acpi/video_detect.c code
unregistered the acpi_video0 device to avoid there being 2 backlight
devices (when acpi_video_get_backlight_type()==native).
This means that userspace used to briefly see 2 devices and the
disappearing of acpi_video0 after a brief time confuses the systemd
backlight level save/restore code, see e.g.:
https://bbs.archlinux.org/viewtopic.php?id=269920
To fix this the ACPI video code has been modified to make backlight class
device registration a separate step, relying on the drm/kms driver to
ask for the acpi_video backlight registration after it is done setting up
its native backlight device.
Add a call to the new acpi_video_register_backlight() after the i915 calls
acpi_video_register() (after setting up the i915 opregion) so that the
acpi_video backlight devices get registered on systems where the i915
native backlight device is not registered.
Changes in v2:
-Only call acpi_video_register_backlight() when a panel is detected
Changes in v3:
-Add a new intel_acpi_video_register() helper which checks if a panel
is present and then calls acpi_video_register_backlight()
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
A lot of modern laptops use the Parade PS8461E MUX for eDP
switching. The MUX can operate in jitter cleaning mode or
redriver mode, the first one resulting in higher link
quality. The jitter cleaning mode needs to know the link
rate used and the MUX achieves this by snooping the
LINK_BW_SET, LINK_RATE_SELECT and SUPPORTED_LINK_RATES
DPCD accesses.
When the MUX is powered down (seems this can happen whenever
the display is turned off) it loses track of the snooped
link rates so when we do the LINK_RATE_SELECT write it no
longer knowns which link rate we're selecting, and thus it
falls back to the lower quality redriver mode. This results
in unstable high link rates (eg. usually 8.1Gbps link rate
no longer works correctly).
In order to avoid all that let's re-snoop SUPPORTED_LINK_RATES
from the sink at the start of every link training.
Unfortunately we don't have a way to detect the presence of
the MUX. It looks like the set of laptops equipped with this
MUX is fairly large and contains devices from multiple
manufacturers. It may also still be growing with new models.
So a quirk doesn't seem like a very easily maintainable
option, thus we shall attempt to do this unconditionally on
all machines that use LINK_RATE_SELECT. Hopefully this extra
DPCD read doesn't cause issues for any unaffected machine.
If that turns out to be the case we'll need to convert this
into a quirk in the future.
Cc: stable@vger.kernel.org
Cc: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6205
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220902070319.15395-1-ville.syrjala@linux.intel.com
Tested-by: Aaron Ma <aaron.ma@canonical.com>
Tested-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
The current scheme for generating the LFP data table pointers
(when the block including them is missing from the VBT) expects
the 0xffff sequence to only appear in the fp_timing terminator
entries. However some VBTs also have extra 0xffff sequences
elsewhere in the LFP data. When looking for the terminators
we may end up finding those extra sequeneces insted, which means
we deduce the wrong size for the fp_timing table. The code
then notices the inconsistent looking values and gives up on
the generated data table pointers, preventing us from parsing
the LFP data table entirely.
Let's give up on the "search for the terminators" approach
and instead just hardcode the expected size for the fp_timing
table.
We have enough sanity checks in place to make sure we
shouldn't end up parsing total garbage even if that size
should change in the future (although that seems unlikely
as the fp_timing and dvo_timing tables have been declared
obsolete as of VBT version 229).
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6592
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220818192223.29881-3-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Turns out the MIPI sequence block version number and
new block size fields are considered part of the block
header and are not included in the reported new block size
field itself. Bump up the block size appropriately so that
we'll copy over the last five bytes of the block as well.
For this particular machine those last five bytes included
parts of the GPIO op for the backlight on sequence, causing
the backlight no longer to turn back on:
Sequence 6 - MIPI_SEQ_BACKLIGHT_ON
Delay: 20000 us
- GPIO index 0, number 0, set 0 (0x00)
+ GPIO index 1, number 70, set 1 (0x01)
Cc: stable@vger.kernel.org
Fixes: e163cfb4c9 ("drm/i915/bios: Make copies of VBT data blocks")
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6652
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220829135834.8585-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Sync drm-intel-next with v6.0-rc as well as recent drm-intel-gt-next.
Since drm-next does not have commit f0c70d41e4 ("drm/i915/guc: remove
runtime info printing from time stamp logging") yet, only
drm-intel-gt-next, will need to do that as part of the merge here to
build.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
