- 12 Nov, 2018 4 commits
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Lionel Landwerlin authored
subslice_mask is an array indexed by slice, not subslice. Signed-off-by:
Lionel Landwerlin <lionel.g.landwerlin@intel.com> Fixes: 8cc76693 ("drm/i915: store all subslice masks") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108712Reviewed-by:
Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181112123931.2815-1-lionel.g.landwerlin@intel.com
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Ville Syrjälä authored
Pass on the errno all the way from connected_sink_max_bpp(), and make the base_bpp handling in intel_modeset_pipe_config() a bit less ugly. We'll also rename connected_sink_max_bpp() to not give the impression that it return the bpp value, and we'll pimp up the debug message within to include the connector name/id. Signed-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181107213522.17590-3-ville.syrjala@linux.intel.comReviewed-by:
Imre Deak <imre.deak@intel.com>
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Ville Syrjälä authored
We just 'return ret' immediately after jumping to the label. Let's return directly instead. Signed-off-by:
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Ville Syrjälä authored
ironlake_check_fdi_lanes() may try to grab some extra crtc locks. If that fails we need to propagate the -EDEADLK all the way up, and we shouldn't dump out the crtc state or other debug messages either since it wasn't the crtc state that caused the failure. Just hit this on my IVB: [drm:intel_atomic_check [i915]] checking fdi config on pipe C, lanes 3 [drm:intel_atomic_check [i915]] only 2 lanes on pipe C: required 3 lanes [drm:intel_atomic_check [i915]] fdi link bw constraint, reducing pipe bpp to 18 [drm:intel_atomic_check [i915]] checking fdi config on pipe C, lanes 2 [drm:intel_atomic_check [i915]] CRTC bw constrained, retrying [drm:intel_dp_compute_config [i915]] DP link computation with max lane count 4 max rate 270000 max bpp 18 pixel clock 185580KHz [drm:intel_dp_compute_config [i915]] DP lane count 4 clock 162000 bpp 18 [drm:intel_dp_compute_config [i915]] DP link rate required 417555 available 648000 [drm:intel_atomic_check [i915]] checking fdi config on pipe C, lanes 2 WARNING: CPU: 4 PID: 25115 at ../drivers/gpu/drm/drm_modeset_lock.c:241 drm_modeset_lock+0xbc/0xd0 [drm] ... WARNING: CPU: 4 PID: 25115 at ../drivers/gpu/drm/drm_modeset_lock.c:223 drm_modeset_drop_locks+0x4a/0x50 [drm] The warnings are from 'WARN_ON(ctx->contended)'. Signed-off-by:
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- 09 Nov, 2018 24 commits
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Daniele Ceraolo Spurio authored
We dump the info as an array of u8, so we want to know the length in number of bytes. Current code is still safe because the variable we use BITS_PER_TYPE on is a u8. Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Signed-off-by:
Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Reviewed-by:
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Daniele Ceraolo Spurio authored
We have a subslice mask per slice, not per subslice. MAX_SUBSLICES > MAX_SLICES, so the wrong size didn't cause any issue apart from using extra memory. Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Signed-off-by:
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José Roberto de Souza authored
In the past we had hooks to configure HW for VLV/CHV too, in the drop of VLV/CHV support the intel_psr_disable_source() code was not moved to the caller, so doing it here. Suggested-by:
Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Reviewed-by:
José Roberto de Souza <jose.souza@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181106190843.18009-4-jose.souza@intel.com
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José Roberto de Souza authored
All other interruptions gen11 interruptions are reset in gen11_irq_reset() also it is done for other gens that supports PSR. Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by:
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José Roberto de Souza authored
It should always wait for idle state when disabling PSR because PSR could be inactive due a call to intel_psr_exit() and while PSR is still being disabled asynchronously userspace could change the modeset causing a call to psr_disable() that will not wait for PSR idle and then PSR will be enabled again while PSR is still not idle. v2: rebased on top of the patch reusing psr_exit() Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Reviewed-by:
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José Roberto de Souza authored
Both functions have the same code to disable PSR, so let's reuse that code instead of duplicate. Suggested-by:
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Ville Syrjälä authored
Make skl_ddb_allocation_overlaps() useful for other callers besides skl_update_crtcs(). We'll need it to do plane updates as well. And while we're here we can reduce the stack utilization a bit by noting that each struct skl_ddb_entry is 4 bytes whereas a pointer to one is 8 bytes (on 64bit). So we'll switch to an array of structs from the array of pointers we used before. Signed-off-by:
Rodrigo Vivi <rodrigo.vivi@intel.com>
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Ville Syrjälä authored
On skl+ the scaler (when enabled) will take care of the plane output position. Make the code less ugly by just setting crtc_x/y to 0 when the scaler is enabled. Signed-off-by:
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Ville Syrjälä authored
Due to the constant alpha we're going to have to program two of the the tree keying registers anyway, so might as well always program all three. And parametrize the plane constant alpha define while at it. v2: Rebase due to input CSC Signed-off-by:
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Ville Syrjälä authored
If we don't need the PS_PWR_GATE write when programming the pipe scaler I don't see why we'd need it for plane scalers either. Just remove it. Signed-off-by:
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José Roberto de Souza authored
MST is only supported in DDI ports that have this hook, so the null check can be dropped. Suggested-by:
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José Roberto de Souza authored
MST ports did not had the post_pll_disable() hook causing the references get in pre_pll_enable() never being released causing DDI and AUX CH being enabled all the times. v2: renamed intel_mst_post_pll_disable_dp() parameters Reviewed-by:
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José Roberto de Souza authored
intel_dp_detect() caches the aux_domain in the beginning of the function as it is used twice, so lets also use it as the aux_domain don't change in runtime. v3: returning intel_dp_retrain_link() error insted of connector_status_disconnected Cc: Imre Deak <imre.deak@intel.com> Reviewed-by:
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Ville Syrjälä authored
IBX has a documented workaround which states that when we disable the port we must change its transcoder select to A, otherwise it will prevent the other port (DP vs. HDMI/SDVO) from using transcoder A. We implement the workaround during encoder disable, but looks like some BIOSen leave transcoder B selected even when the port wasn't actually enabled by the BIOS. That will trip up our asserts that attempt to make sure we never forget this w/a. Sanitize the transcoder select to A for all disabled PCH DP/HDMI/SDVO ports. We assume that the port was never enabled by the BIOS on transcoder B, because if it had we'd actually have to toggle the port on and back off to properly switch it back to transcoder A. That would cause some display flicker if transcoder A is already enabled on some other port, so it's better not to do it unless absolutely necessary. Since we have no indication that the transcoder select is misbehaving on the affected machines we can assume the port was never actually enabled by the BIOS. This cures warning like this during driver load: IBX PCH DP C still using transcoder B WARNING: CPU: 2 PID: 172 at drivers/gpu/drm/i915/intel_display.c:1279 assert_pch_dp_disabled+0x9e/0xb0 [i915] v2: Add comments to remind the reader that SDVOB==HDMIB (Chris) Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
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Ville Syrjälä authored
In my haste to remove irq_port[] I accidentally changed the way we deal with hpd pins that are shared by multiple encoders (DP and HDMI for pre-DDI platforms). Previously we would only handle such pins via ->hpd_pulse(), but now we queue up the hotplug work for the HDMI encoder directly. Worse yet, we now count each hpd twice and this increment the hpd storm count twice as fast. This can lead to spurious storms being detected. Go back to the old way of doing things, ie. delegate to ->hpd_pulse() for any pin which has an encoder with that hook implemented. I don't really like the idea of adding irq_port[] back so let's loop through the encoders first to check if we have an encoder with ->hpd_pulse() for the pin, and then go through all the pins and decided on the correct course of action based on the earlier findings. I have occasionally toyed with the idea of unifying the pre-DDI HDMI and DP encoders into a single encoder as well. Besides the hotplug processing it would have the other benefit of preventing userspace from trying to enable both encoders at the same time. That is simply illegal as they share the same clock/data pins. We have some testcases that will attempt that and thus fail on many older machines. But for now let's stick to fixing just the hotplug code. Cc: stable@vger.kernel.org # 4.19+ Cc: Lyude Paul <lyude@redhat.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Fixes: b6ca3eee ("drm/i915: Nuke dev_priv->irq_port[]") Signed-off-by:
Lyude Paul <lyude@redhat.com>
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Imre Deak authored
We shouldn't consider an encoder inactive if it doesn't have a CRTC linked, but has virtual MST encoders with a crtc linked. Fix this. Also we should not sanitize the mapping for MST encoders, as it's always their primary encoder (which could be even in SST mode) whose active state determines if we need the clock being enabled for the corresponding physical port. Fix this too. This fixes at least an existing breakage where we incorrectly disabled the clock for an active DP encoder when sanitizing its MST virtual encoders. Not sure if there are BIOSes that enable an output in MST mode, but our HW readout is mostly missing for it anyway, so just warn for that case. Fixes: 70332ac5 ("drm/i915/icl+: Sanitize port to PLL mapping") Cc: Antonio Argenziano <antonio.argenziano@intel.com> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Reported-by:
Antonio Argenziano <antonio.argenziano@intel.com> Signed-off-by:
Clint Taylor <Clinton.A.Taylor@intel.com> Reviewed-by:
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Imre Deak authored
Check for reserved register field values and conflicting transcoder->port mappings (both MST and non-MST mappings or multiple SST mappings). This is also needed for the next patch to determine if a port is in MST mode during sanitization after HW readout. Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Antonio Argenziano <antonio.argenziano@intel.com> Signed-off-by:
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Chris Wilson authored
While our little rcu worker might be able to be replaced now by the dedicated rcu_work, in the meantime we should mark up the rcu_head for correct debugobjects tracking. Signed-off-by:
Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181108092101.27598-2-chris@chris-wilson.co.uk
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Chris Wilson authored
Make the rcu_head known to the system, in particular for debugobjects. And having declared it for debugobjects, we need to tidy up afterwards. v2: mark the obj->rcu as being destroyed when we reuse its location for the freed list. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108691Signed-off-by:
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José Roberto de Souza authored
All other overlay functions(almost all other functions in i915) follow intel_overlay_verb, so renaming overlay ones that do not match that. Cc: Jani Nikula <jani.nikula@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
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José Roberto de Souza authored
IPC is a display feature, so i915_load_modeset_init() is the right place to initialize it. Cc: Jani Nikula <jani.nikula@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
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José Roberto de Souza authored
Although FBC helps save power it do not belongs to power management also the cleanup was placed in i915_driver_unload() also not a good place. intel_modeset_init()/intel_modeset_cleanup() are better places also this will help make easy disable features that depends in display being enabled in driver. Cc: Jani Nikula <jani.nikula@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
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José Roberto de Souza authored
i915_load_modeset_init() is a more suitable place than i915_driver_load() as vblank is part of modeset. Cc: Jani Nikula <jani.nikula@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
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Paulo Zanoni authored
This reduces the size of struct skl_wm_level from 6 to 4, which reduces the size of struct skl_plane_wm from 104 to 70, which reduces the size of struct skl_pipe_wm from 524 to 356. A reduction of 168 padding bytes per pipe. This will increase even more the next time we bump I915_MAX_PLANES. v2: Paste the pahole output provided by Lucas: $ pahole -s -C skl_wm_level drivers/gpu/drm/i915/i915.o struct skl_wm_level { bool plane_en; /* 0 1 */ /* XXX 1 byte hole, try to pack */ uint16_t plane_res_b; /* 2 2 */ uint8_t plane_res_l; /* 4 1 */ /* size: 6, cachelines: 1, members: 3 */ /* sum members: 4, holes: 1, sum holes: 1 */ /* padding: 1 */ /* last cacheline: 6 bytes */ }; Reviewed-by:Lucas De Marchi <lucas.demarchi@intel.com> Signed-off-by:
Paulo Zanoni <paulo.r.zanoni@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181016220133.26991-3-paulo.r.zanoni@intel.com
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- 08 Nov, 2018 7 commits
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Chris Wilson authored
We have multiple instances of VCS but only remember to invalidate the BSD caches on the first, ignoring the stale caches of any other engine. Signed-off-by:
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Imre Deak authored
On ICL DMC/PCODE retains the HW context only for port A across DC transitions, for the other port B combo PHY, it doesn't. So we need to do this manually after exiting from DC6. Do the reinit even after exiting from DC5, it won't hurt since we only reinit the PHY in case it's needed (in case it was disabled to begin with). As can be guessed from the bugzilla report leaving the PHY uninited will lead to a later timeout during the port B specific AUX and DDI_IO power well enabling. v2: - Apply the fix on all GEN>=11 platforms. (Rodrigo) Bspec: 21257 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108070 Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by:
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Imre Deak authored
Bspec says we should skip the initialization of combo PHYs that are already initialized. We'll need to reinit the PHYs more frequently when exiting from DC6 (after the next patch), so let's make sure the uninit sequence complies with the spec. For safety skip the init only if all the PHY register fields have their expected values. v2: - Print 'Port X' as we do elsewhere instead of 'Port-X'. (Jose) Bspec: 21257 Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by:
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Imre Deak authored
Verify on CNL, ICL that the combo PHY HW state stayed intact after PHY initialization. v2: - Print 'Port X' as we do elsewhere instead of 'Port-X'. (Jose) Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by:
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Imre Deak authored
Similarly to the GEN9_LP DPIO PHY code keep the CNL+ combo PHY code in a separate file. No functional change. v2: - Use SPDX license tag instead of boilerplate. (Rodrigo) v3: - Use MIT instead of GPL-2.0 license. (Ville) Suggested-by:
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Imre Deak authored
BSpec says to clear the comp init HW flag too during combo PHY uninit, so do that. The lack of this could badly interact with the PHY reinit after a DC6/9 transition at least, where (after a follow-up patch fixing the init code) we'd skip the initialization incorrectly due to this flag being set. BSpec: 21257 Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by:
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Chris Wilson authored
Ensure that the writes into the context image are completed prior to the register mmio to trigger execution. Although previously we were assured by the SDM that all writes are flushed before an uncached memory transaction (our mmio write to submit the context to HW for execution), we have empirical evidence to believe that this is not actually the case. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108656 References: https://bugs.freedesktop.org/show_bug.cgi?id=108315 References: https://bugs.freedesktop.org/show_bug.cgi?id=106887Signed-off-by:
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- 07 Nov, 2018 5 commits
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Imre Deak authored
To enable DC5/6 power well 2 has to be disabled as for previous platforms, so fix things up. Bspec: 4234 Fixes: 67ca07e7 ("drm/i915/icl: Add power well support") Cc: Animesh Manna <animesh.manna@intel.com> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
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Lyude Paul authored
Unfortunately, it seems that the HPD IRQ storm problem from the early days of Intel GPUs was never entirely solved, only mostly. Within the last couple of days, I got a bug report from one of our customers who had been having issues with their machine suddenly booting up very slowly after having updated. The amount of time it took to boot went from around 30 seconds, to over 6 minutes consistently. After some investigation, I discovered that i915 was reporting massive amounts of short HPD IRQ spam on this system from the DisplayPort port, despite there not being anything actually connected. The symptoms would start with one "long" HPD IRQ being detected at boot: [ 1.891398] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00440000, dig 0x00440000, pins 0x000000a0 [ 1.891436] [drm:intel_hpd_irq_handler [i915]] digital hpd port B - long [ 1.891472] [drm:intel_hpd_irq_handler [i915]] Received HPD interrupt on PIN 5 - cnt: 0 [ 1.891508] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - long [ 1.891544] [drm:intel_hpd_irq_handler [i915]] Received HPD interrupt on PIN 7 - cnt: 0 [ 1.891592] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port B - long [ 1.891628] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port D - long … followed by constant short IRQs afterwards: [ 1.895091] [drm:intel_encoder_hotplug [i915]] [CONNECTOR:66:DP-1] status updated from unknown to disconnected [ 1.895129] [drm:i915_hotplug_work_func [i915]] Connector DP-3 (pin 7) received hotplug event. [ 1.895165] [drm:intel_dp_detect [i915]] [CONNECTOR:72:DP-3] [ 1.895275] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00200000, dig 0x00200000, pins 0x00000080 [ 1.895312] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short [ 1.895762] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00200000, dig 0x00200000, pins 0x00000080 [ 1.895799] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short [ 1.896239] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status 0x71450085 [ 1.896293] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00200000, dig 0x00200000, pins 0x00000080 [ 1.896330] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short [ 1.896781] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00200000, dig 0x00200000, pins 0x00000080 [ 1.896817] [drm:intel_hpd_irq_handler [i915]] digital hpd port D - short [ 1.897275] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00200000, dig 0x00200000, pins 0x00000080 The customer's system in question has a GM45 GPU, which is apparently well known for hotplugging storms. So, workaround this impressively broken hardware by changing the default HPD storm threshold from 5 to 50. Then, make long IRQs count for 10, and short IRQs count for 1. This makes it so that 5 long IRQs will trigger an HPD storm, and on systems with short HPD storm detection 50 short IRQs will trigger an HPD storm. 50 short IRQs amounts to 100ms of constant pulsing, which seems like a good middleground between being too sensitive and not being sensitive enough (which would cause visible stutters in userspace every time a storm occurs). And just to be extra safe: we don't enable this by default on systems with MST support. There's too high of a chance of MST support triggering storm detection, and systems that are new enough to support MST are a lot less likely to have issues with IRQ storms anyway. As a note: this patch was tested using a ThinkPad T450s and a Chamelium to simulate the short IRQ storms. Changes since v1: - Don't use two separate thresholds, just make long IRQs count for 10 each and short IRQs count for 1. This simplifies the code a bit - Ville Syrjälä Changes since v2: - Document @long_hpd in intel_hpd_irq_storm_detect, no functional changes Changes since v4: - Remove !! in long_hpd assignment - Ville Syrjälä - queue_hp = true - Ville Syrjälä Signed-off-by:
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Lyude Paul authored
This is rather confusing to look at as-is: dev_priv->display.hpd_irq_setup(dev_priv); in intel_hpd_irq_handler() handles disabling the actual HPD IRQ, while intel_hpd_irq_storm_disable() handles moving the HPD pin state over from MARK_DISABLED to DISABLED along with enabling polling for it. Changes since v3: - Rename i915_hpd_irq_storm_disable() to i915_hpd_irq_storm_switch_to_polling() - Rodrigo Vivi Signed-off-by:
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Lyude Paul authored
Currently in intel_hpd_irq_storm_detect() when we detect that the last recorded hotplug wasn't within the period defined by HPD_STORM_DETECT_DELAY, we make the mistake of resetting the HPD count to 0 without incrementing it. This results in us only enabling storm detection when we go +2 above the threshold, e.g. an HPD threshold of 5 would not trigger a storm until we reach a total of 7 hotplugs. So: rework the code a bit so we reset the HPD count when HPD_STORM_DETECT_DELAY has passed, then increment the count afterwards. Also, clean things up a bit to make it easier to undertand. Signed-off-by:
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Lyude Paul authored
Turns out that if you trigger an HPD storm on a system that has an MST topology connected to it, you'll end up causing the kernel to eventually hit a NULL deref: [ 332.339041] BUG: unable to handle kernel NULL pointer dereference at 00000000000000ec [ 332.340906] PGD 0 P4D 0 [ 332.342750] Oops: 0000 [#1] SMP PTI [ 332.344579] CPU: 2 PID: 25 Comm: kworker/2:0 Kdump: loaded Tainted: G O 4.18.0-rc3short-hpd-storm+ #2 [ 332.346453] Hardware name: LENOVO 20BWS1KY00/20BWS1KY00, BIOS JBET71WW (1.35 ) 09/14/2018 [ 332.348361] Workqueue: events intel_hpd_irq_storm_reenable_work [i915] [ 332.350301] RIP: 0010:intel_hpd_irq_storm_reenable_work.cold.3+0x2f/0x86 [i915] [ 332.352213] Code: 00 00 ba e8 00 00 00 48 c7 c6 c0 aa 5f a0 48 c7 c7 d0 73 62 a0 4c 89 c1 4c 89 04 24 e8 7f f5 af e0 4c 8b 04 24 44 89 f8 29 e8 <41> 39 80 ec 00 00 00 0f 85 43 13 fc ff 41 0f b6 86 b8 04 00 00 41 [ 332.354286] RSP: 0018:ffffc90000147e48 EFLAGS: 00010006 [ 332.356344] RAX: 0000000000000005 RBX: ffff8802c226c9d4 RCX: 0000000000000006 [ 332.358404] RDX: 0000000000000000 RSI: 0000000000000082 RDI: ffff88032dc95570 [ 332.360466] RBP: 0000000000000005 R08: 0000000000000000 R09: ffff88031b3dc840 [ 332.362528] R10: 0000000000000000 R11: 000000031a069602 R12: ffff8802c226ca20 [ 332.364575] R13: ffff8802c2268000 R14: ffff880310661000 R15: 000000000000000a [ 332.366615] FS: 0000000000000000(0000) GS:ffff88032dc80000(0000) knlGS:0000000000000000 [ 332.368658] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 332.370690] CR2: 00000000000000ec CR3: 000000000200a003 CR4: 00000000003606e0 [ 332.372724] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 332.374773] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 332.376798] Call Trace: [ 332.378809] process_one_work+0x1a1/0x350 [ 332.380806] worker_thread+0x30/0x380 [ 332.382777] ? wq_update_unbound_numa+0x10/0x10 [ 332.384772] kthread+0x112/0x130 [ 332.386740] ? kthread_create_worker_on_cpu+0x70/0x70 [ 332.388706] ret_from_fork+0x35/0x40 [ 332.390651] Modules linked in: i915(O) vfat fat joydev btusb btrtl btbcm btintel bluetooth ecdh_generic iTCO_wdt wmi_bmof i2c_algo_bit drm_kms_helper intel_rapl syscopyarea sysfillrect x86_pkg_temp_thermal sysimgblt coretemp fb_sys_fops crc32_pclmul drm psmouse pcspkr mei_me mei i2c_i801 lpc_ich mfd_core i2c_core tpm_tis tpm_tis_core thinkpad_acpi wmi tpm rfkill video crc32c_intel serio_raw ehci_pci xhci_pci ehci_hcd xhci_hcd [last unloaded: i915] [ 332.394963] CR2: 00000000000000ec This appears to be due to the fact that with an MST topology, not all intel_connector structs will have ->encoder set. So, fix this by skipping connectors without encoders in intel_hpd_irq_storm_reenable_work(). For those wondering, this bug was found on accident while simulating HPD storms using a Chamelium connected to a ThinkPad T450s (Broadwell). Changes since v1: - Check intel_connector->mst_port instead of intel_connector->encoder Signed-off-by:
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