Resetting the GPU doesn't affect the RPS/RC6 state, so we can stop
forcibly reloading the registers.

Ville suggested this many moons ago, I said at that time that sanitizing
was no harm and meant that our bookkeeping was kept consistent with the
HW. However, in a forthcoming series, we want to split rps/rc6 GT
powermanagement and one of the key simplifications is the control of
when we enable it. Performing a crude sanitize in the middle of
i915_gem_reset() is then a huge wart.
Suggested-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NSagar Arun Kamble <sagar.a.kamble@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180410133354.13425-1-chris@chris-wilson.co.uk

Adding a i915_fifo_underrun_reset debugfs file will make it possible
for IGT tests to clear FIFO underrun fallout at the start of each
subtest, and make re-enable FBC so tests always have maximum exposure
to features used by IGT. FIFO underruns and FBC bugs will no longer
hide when an earlier subtests disables both.
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
References: https://bugs.freedesktop.org/show_bug.cgi?id=105685
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105681
Link: https://patchwork.freedesktop.org/patch/msgid/20180328100526.36467-1-maarten.lankhorst@linux.intel.comAcked-by: NJani Nikula <jani.nikula@linux.intel.com>
[mlankhorst: Reset FBC reason if underrun had occurred. (vivijim)]
Reviewed-by: NRodrigo Vivi <rodrigo.vivi@intel.com>

Inside the psr work function, we want to wait for PSR to idle first and
wish to do so without blocking the normal modeset path, so we do so
without holding the PSR lock. However, we first have to find which pipe
PSR was enabled on, which requires chasing into the PSR struct and
requires locking to prevent intel_psr_disable() from concurrently
setting our pointer to NULL.

Fixes: 995d3047 ("drm/i915: VLV/CHV PSR Software timer mode")
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Durgadoss R <durgadoss.r@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: <stable@vger.kernel.org> # v4.0+
Reviewed-by: NJose Roberto de Souza <jose.souza@intel.com>
Acked-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180405114915.29609-1-chris@chris-wilson.co.uk

On GLK sporadic timeouts occur during PHY0 enabling. Based on logs it looks
like they happen sometime after a system suspend/resume cycle, with the
same power well enabling succeeding both before and after the failed
one and no other problems observed. The current timeout in the code is
not actually specified by BSpec, so let's try to increase that until a
BSpec update.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105771Signed-off-by: NImre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180409122716.4055-1-imre.deak@intel.comReviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>

All the references to get_existing_state can be converted to
get_new_state or get_old_state, which means that i915 is now
get_existing_state free.
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180409124656.39886-3-maarten.lankhorst@linux.intel.com
[mlankhorst: Fix alignment in prepare_plane_fb. (Ville)]
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>

get_existing_crtc_state is currently unused, get rid of it.
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180409124656.39886-2-maarten.lankhorst@linux.intel.comReviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>

The get_existing macros are deprecated and should be replaced by
get_old/new_state for clarity.
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180409124656.39886-1-maarten.lankhorst@linux.intel.com
[mlankhorst: Remove useless warn. (Ville)]
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>

Include fence context and seqno in low level tracing so it is easier to
follow flows of individual requests when things go bad.

Also added tracing on the reset side of things.

v2:
 Chris Wilson:
 * Standardize global_seqno and seqno as global.
 * Include current hws seqno in execlists_cancel_port_requests.

v3:
 * Fix port printk format for all builds.
Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> # v2
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180406123514.5809-1-tvrtko.ursulin@linux.intel.com

Enclose for_each_engine_masked macro arguments in parentheses.

v2:
 * Fixup whitespace to satisfy checkpatch.
 * Likewise reformat to 80 chars.
Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180406114407.25360-1-tvrtko.ursulin@linux.intel.com

This patch updates scaler max limit support for NV12

v2: Rebased (me)

v3: Rebased (me)

v4: Missed the Tested-by/Reviewed-by in the previous series
Adding the same to commit message in this version.

v5: Addressed review comments from Ville and rebased
- calculation of max_scale to be made
less convoluted by splitting it up a bit
- Indentation errors to be fixed in the series

v6: Rebased (me)
Fixed review comments from Paauwe, Bob J
Previous version, where a split of calculation
was done, was wrong. Fixed that issue here.

v7: Rebased (me)

v8: Rebased (me)

v9: Rebased (me)

v10: Rebased (me)

v11: Addressed review comments from Shashank Sharma
Alignment issues fixed.
When call to skl_update_scaler is made, 0 was being
sent instead of pixel_format.
When crtc update scaler is called, we dont have the
fb to derive the pixel format. Added the function
parameter bool plane_scaler_check to account for this.

v12: Fixed failure in IGT debugfs_test.
fb is NULL in skl_update_scaler_plane
Due to this, accessing fb->format caused failure.
Patch checks fb before using.

v13: In the previous version there was a flaw.
In skl_update_scaler during plane_scaler_check
if the format was non-NV12, it would set need_scaling
to false. This could reset the previously set need_scaling
from a previous condition check. Patch fixes this.
Patch also adds minimum src height for YUV 420 formats
to 16 (as defined in BSpec) and adds for checking this
range.

v14: Addressed review comments from Maarten
Just add a check for NV12 min src height in
skl_update_scaler and retain the remaining checks
as is. Added Reviewed By from Juha-Pekka Heikkila.

v15: Rebased the series.

v16: Changed fb height restriction to be >= 16 as per
Bspec. Earlier it was > 16.

v17: Adding src width and height to be mult of 4 restriction
to avoid pipe fifo underruns for NV12.

Credits-to: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Tested-by: NClinton Taylor <clinton.a.taylor@intel.com>
Reviewed-by: NClinton Taylor <clinton.a.taylor@intel.com>
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Signed-off-by: NChandra Konduru <chandra.konduru@intel.com>
Signed-off-by: NNabendu Maiti <nabendu.bikash.maiti@intel.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-15-git-send-email-vidya.srinivas@intel.com

This patch adds NV12 to format_is_yuv() function
for sprite planes.

v2:
-Use intel_ prefix for format_is_yuv (Ville)

v3: Rebased (me)

v4: Rebased and addressed review comments from Clinton A Taylor.
"static function in intel_sprite.c is not available
to the primary plane functions".
Changed commit message - function modified for
sprite planes.

v5: Missed the Tested-by/Reviewed-by in the previous series
Adding the same to commit message in this version.

v6: Rebased (me)

v7: Rebased (me)

v8: Rebased (me)

v9: Rebased (me)

v10: Changed intel_format_is_yuv function from
static to non-static. We need to use it later from
other files for check.

v11: Rebased the patch. format_is_yuv has already
been renamed to intel_format_is_yuv in the color
patch series which is already merged. This function
which was previously static has already been made
non-static. So this patch after rebase just adds
NV12 to intel_format_is_yuv function.

v12: Added reviewed by from Juha-Pekka Heikkila

v13/v14/v15: Rebased the series
Tested-by: NClinton Taylor <clinton.a.taylor@intel.com>
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NClinton Taylor <clinton.a.taylor@intel.com>
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Signed-off-by: NChandra Konduru <chandra.konduru@intel.com>
Signed-off-by: NNabendu Maiti <nabendu.bikash.maiti@intel.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-14-git-send-email-vidya.srinivas@intel.com

This patch sets appropriate scaler mode for NV12 format.
In this mode, skylake scaler does either chroma-upsampling or
chroma-upsampling and resolution scaling

v2: Review comments from Ville addressed
NV12 case to be checked first for setting
the scaler

v3: Rebased (me)

v4: Rebased (me)

v5: Missed the Tested-by/Reviewed-by in the previous series
Adding the same to commit message in this version.

v6: Rebased (me)

v7: Rebased (me)

v8: Rebased (me)
Restricting the NV12 change for scaler to BXT and KBL
in this series.

v9: Rebased (me)

v10: As of now, NV12 has been tested on Gen9 and Gen10. However,
code is applicable to all GEN >= 9. Hence making
that change to keep it generic.
Comments under v8 is not valid anymore.

v11: Addressed review comments by Shashank Sharma.
For Gen10+, the scaler mode to be set it planar or normal
(single bit). Changed the code to be applicable to all
Gen.

v12: Addressed review comments from Shashank Sharma
For Gen9 (apart from GLK) bits 28:29 to be programmed
in PS_CTRL for NV12. For GLK and Gen10+, bit 29 to be set
for all Planar.

v13: Addressed review comments from Juha-Pekka Heikkila
"NV12 not to be supported by SKL"
Adding Reviewed by tag from Shashank Shamr

v14: Added reviewed by from Juha-Pekka Heikkila

v15: Rebased the series
Tested-by: NClinton Taylor <clinton.a.taylor@intel.com>
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Reviewed-by: NClinton Taylor <clinton.a.taylor@intel.com>
Signed-off-by: NChandra Konduru <chandra.konduru@intel.com>
Signed-off-by: NNabendu Maiti <nabendu.bikash.maiti@intel.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-13-git-send-email-vidya.srinivas@intel.com

If the fb format is YUV, enable the plane CSC mode bits
for the conversion.

v2: Addressed review comments from Shashank Sharma
Alignment issue fixed in i915_reg.h

v3: Adding Reviewed By from Shashank Sharma

v4: Rebased the patch. As part of rebasing, re-using
the color series defines which are already merged.
plane_state->base.color_encoding might not be set for
NV12. For now, just using PLANE_COLOR_CSC_MODE_YUV709_TO_RGB709
in glk_plane_color_ctl if format is NV12.

v5: Added reviewed by from Juha-Pekka Heikkila

v6: Rebased the series
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-12-git-send-email-vidya.srinivas@intel.com

Display WA 827 applies to GEN9 (excluede GLK) and CNL.
Switching the plane format from NV12 to RGB and leaving system idle
results in display underrun and corruption.
WA: Set the bit 15 & bit 19 to 1b in the CLKGATE_DIS_PSL
register for the pipe in which NV12 plane is enabled.

v2: Addressed review comments from Maarten and
Juha-Pekka Heikkila. Added reviewed by from
Juha-Pekka Heikkila.

v3: Rebased the series
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Signed-off-by: NChandra Konduru <chandra.konduru@intel.com>
Signed-off-by: NNabendu Maiti <nabendu.bikash.maiti@intel.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-11-git-send-email-vidya.srinivas@intel.com

This patch splits skl_compute_wm/ddb functions into two parts.
One adds all affected pipes after the commit to atomic_state structure
and second part does compute the DDB.

v2: Added reviewed by tag from Shashank Sharma

v3: Added reviewed by from Juha-Pekka Heikkila

v4: Rebased the series

v5: Fixed checkpatch error. Changed *changed = true
to (*changed) = true;
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-10-git-send-email-vidya.srinivas@intel.com

Display Workaround #0826 (SKL:ALL BXT:ALL) & #1059(CNL:A)
Hardware sometimes fails to wake memory from pkg C states fetching the
last few lines of planar YUV 420 (NV12) planes. This causes
intermittent underflow and corruption.
WA: Disable package C states or do not enable latency levels 1 through 7
(WM1 - WM7) on NV12 planes.

v2: Addressed review comments by Maarten.

v3: Adding reviewed by tag from Shashank Sharma

v4: Added reviewed by from Juha-Pekka Heikkila

v5: Rebased the series
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-9-git-send-email-vidya.srinivas@intel.com

DDB allocation optimization algorithm requires/assumes ddb allocation for
any memory C-state level DDB value to be as high as level below the
current level. Render decompression requires level WM to be as high as
wm level-0. This patch fulfils both the requirements.

v2: Changed plane_num to plane_id in skl_compute_wm_levels

v3: Addressed review comments from Shashank Sharma
Changed the commit message "statement can be more clear,
"DDB value to be as high as level below " what is level below ?"

v4: Added reviewed by tag from Shashank Sharma

v5: Added reviewed by from Juha-Pekka Heikkila

v6: Rebased the series
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-8-git-send-email-vidya.srinivas@intel.com

This patch passes skl_wm_level structure itself to watermark
computation function skl_compute_plane_wm function (instead
of its internal parameters). It reduces number of arguments
required to be passed.

v2: Addressed review comments by Shashank Sharma

v3: Adding reviewed by tag from Shashank Sharma

v4: Added reviewed by from Juha-Pekka Heikkila

v5: Rebased the series
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-7-git-send-email-vidya.srinivas@intel.com

NV12 requires WM calculation for UV plane as well.
UV plane WM should also fulfill all the WM related restrictions.

v2: Addressed review comments from Shashank Sharma.

v3: Addressed review comments from Shashank Sharma
Changed plane_num to plane_id in skl_compute_plane_wm_params
and skl_compute_plane_wm.
Adding reviewed by tag from Shashank Sharma

v4: Added reviewed by from Juha-Pekka Heikkila

v5: Rebased the series
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-6-git-send-email-vidya.srinivas@intel.com

For YUV 420 Planar formats like NV12,
buffer allocation is done for Y and UV surfaces separately.
For NV12 plane formats, the UV buffer
allocation must be programmed in the Plane Buffer Config register
and the Y buffer allocation must be programmed in the
Plane NV12 Buffer Config register. Both register values
should be verified during verify_wm_state.

v2: Addressed review comments by Maarten.

v3: Addressed review comments by Shashank Sharma.

v4: Adding reviewed by tag from Shashank Sharma

v5: Added reviewed by from Juha-Pekka Heikkila

v6: Rebased the series
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-5-git-send-email-vidya.srinivas@intel.com

Add support of recognizing DRM_FORMAT_NV12 from plane_format
register value.

v2: Added reviewed by tag from Mika Kahola

v3: Added reviewed by from Juha-Pekka Heikkila

v4: Rebased the series
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NMika Kahola <mika.kahola@intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-4-git-send-email-vidya.srinivas@intel.com

Current code calculates DDB for planar formats in such a way that we
store DDB of plane-0 in plane 1 & vice-versa.
In order to make this clean this patch refactors WM/DDB calculation for
NV12 planar formats.

v2: Addressed review comments by Maarten

v3: Rebased and addressed review comments by Maarten

v4: Fixed a compilation issue of string replacement is_nv12 to
is_planar

v5: Added reviewed by from Juha-Pekka Heikkila

v6: Rebased the series
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: NVidya Srinivas <vidya.srinivas@intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-3-git-send-email-vidya.srinivas@intel.com

skl_wm_values struct contains values of pipe/plane DDB only.
so rename it for better readability of code. Similarly
skl_copy_wm_for_pipe copies DDB values.

s/skl_wm_values/skl_ddb_values
s/skl_copy_wm_for_pipe/skl_copy_ddb_for_pipe

Changes since V1:
 - also change name of skl_copy_wm_for_pipe

v2: Added reviewed by from Juha-Pekka Heikkila

v3: Rebased the series
Reviewed-by: NJuha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-2-git-send-email-vidya.srinivas@intel.com

When doing a modeset where the sink is transitioning from D3 to D0 , it
would sometimes be possible for the initial power_up_phy() to start
timing out. This would only be observed in the last action before the
sink went into D3 mode was intel_dp_sink_dpms(DRM_MODE_DPMS_OFF). We
originally thought this might be an issue with us accidentally shutting
off the aux block when putting the sink into D3, but since the DP spec
mandates that sinks must wake up within 1ms while we have 100ms to
respond to an ESI irq, this didn't really add up. Turns out that the
problem is more subtle then that:

It turns out that the timeout is from us not enabling DPMS on the MST
hub before actually trying to initiate sideband communications. This
would cause the first sideband communication (power_up_phy()), to start
timing out because the sink wasn't ready to respond. Afterwards, we
would call intel_dp_sink_dpms(DRM_MODE_DPMS_ON) in
intel_ddi_pre_enable_dp(), which would actually result in waking up the
sink so that sideband requests would work again.

Since DPMS is what lets us actually bring the hub up into a state where
sideband communications become functional again, we just need to make
sure to enable DPMS on the display before attempting to perform sideband
communications.

Changes since v1:
- Remove comment above if (!intel_dp->is_mst) - vsryjala
- Move intel_dp_sink_dpms() for MST into intel_dp_post_disable_mst() to
  keep enable/disable paths symmetrical
- Improve commit message - dhnkrn
Changes since v2:
- Only send DPMS off when we're disabling the last sink, and only send
  DPMS on when we're enabling the first sink - dhnkrn
Changes since v3:
- Check against is_mst, not intel_dp->is_mst - dhnkrn/vsyrjala
Signed-off-by: NLyude Paul <lyude@redhat.com>
Reviewed-by: NDhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: NLaura Abbott <labbott@redhat.com>
Cc: stable@vger.kernel.org
Fixes: ad260ab3 ("drm/i915/dp: Write to SET_POWER dpcd to enable MST hub.")
Link: https://patchwork.freedesktop.org/patch/msgid/20180407011053.22437-1-lyude@redhat.com

Currently, we rely on inspecting the hangcheck state from within the
i915_reset() routines to determine which engines were guilty of the
hang. This is problematic for cases where we want to run
i915_handle_error() and call i915_reset() independently of hangcheck.
Instead of relying on the indirect parameter passing, turn it into an
explicit parameter providing the set of stalled engines which then are
treated as guilty until proven innocent.

While we are removing the implicit stalled parameter, also make the
reason into an explicit parameter to i915_reset(). We still need a
back-channel for i915_handle_error() to hand over the task to the locked
waiter, but let's keep that its own channel rather than incriminate
another.

This leaves stalled/seqno as being private to hangcheck, with no more
nefarious snooping by reset, be it whole-device or per-engine. \o/

The only real issue now is that this makes it crystal clear that we
don't actually do any testing of hangcheck per se in
drv_selftest/live_hangcheck, merely of resets!
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Jeff McGee <jeff.mcgee@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: NMichel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180406220354.18911-2-chris@chris-wilson.co.uk

If we are resetting just one engine, we know it has stalled. So we can
pass the stalled parameter directly to i915_gem_reset_engine(), which
alleviates the necessity to poke at the generic engine->hangcheck.stalled
magic variable, leaving that under control of hangcheck as its name
implies. Other than simplifying by removing the indirect parameter along
this path, this allows us to introduce new reset mechanisms that run
independently of hangcheck.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Jeff McGee <jeff.mcgee@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: NMichel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180406220354.18911-1-chris@chris-wilson.co.uk

We will want to park GEM before disengaging the drive^W^W^W unwedging.
Since we already do the work for idling, expose the guts as a new
function that we can then reuse.

v2: Just skip if already parked; makes it more forgiving to use by
future callers.
v3: Extract mark_busy, rename it to i915_gem_unpark and place it next to
i915_gem_park so that we can evaluate it for symmetry more easily.
Calling GEM from inside i915_request looks to be a bit of a layering
violation, for the moment I am imaging them as being notify_cb.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> #v1
Reviewed-by: NMichal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180406155144.27791-1-chris@chris-wilson.co.uk

Tvrtko mentioned that wait_for_hang() was confusing as it does not
actually wait for the aforementioned hang, just until the request is
running and we are *ready* to inject a hang. A quick
s/wait_for_hang/wait_until_running/ removes that confusion without
having to rethink the naming scheme, immediately at least.
Suggested-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180406100950.19033-1-chris@chris-wilson.co.uk

AFAICT, once the new interrupt is in place, the rest should behave the
same as Gen10.

v2: Update ring frequencies (Sagar)
v3: Rebase.

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NOscar Mateo <oscar.mateo@intel.com>
Reviewed-by: NMichel Thierry <michel.thierry@intel.com>
Signed-off-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180405140052.10682-5-mika.kuoppala@linux.intel.com

BSpec says:

"Second level interrupt events are stored in the GT INT DW. GT INT DW is
a double buffered structure. A snapshot of events is taken when SW reads
GT INT DW. From the time of read to the time of SW completely clearing
GT INT DW (to indicate end of service), all incoming interrupts are logged
in a secondary storage structure. this guarantees that the record of
interrupts SW is servicing will not change while under service".

We read GT INT DW in several places now:

- The IRQ handler (banks 0 and 1) where, hopefully, it is completely
  cleared (operation now covered with the irq lock).
- The 'reset' interrupts functions for RPS and GuC logs, where we clear
  the bit we are interested in and leave the others for the normal
  interrupt handler.
- The 'enable' interrupts functions for RPS and GuC logs, as a measure
  of precaution. Here we could relax a bit and don't check GT INT DW
  at all or, if we do, at least we should clear the offending bit
  (which is what this patch does).

Note that, if every bit is cleared on reading GT INT DW, the register
won't be locked. Also note that, according to the BSpec, GT INT DW
cannot be cleared without first servicing the Selector & Shared IIR
registers.

v2:
  - Remove some code duplication (Tvrtko)
  - Make sure GT_INTR_DW are protected by the irq spinlock, since it's a
    global resource (Tvrtko)

v3: Optimize the spinlock (Tvrtko)

v4: Rebase.
v5:
  - take spinlock on outer scope to please sparse (Mika)
  - use raw_reg accessors (Mika)
v6: omit the continue in looping banks (Michel)

Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: NOscar Mateo <oscar.mateo@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> (v4)
Signed-off-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: NMichel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180406093237.14548-1-mika.kuoppala@linux.intel.com

Using the new hierarchical interrupt infrastructure.

v2: Rebase
v3: Rebase
v4: use class/instance handler (Mika)

Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NOscar Mateo <oscar.mateo@intel.com>
Signed-off-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: NMichel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180405140052.10682-3-mika.kuoppala@linux.intel.com

Interrupt identity register we already read from hardware
contains engine class and instance fields. Leverage
these fields to find correct engine to handle the interrupt.

v3: rebase on top of rps intr
    use correct class / instance limits (Michel)
v4: split engine/other handling
v5: empty iir is not err (Daniele, Michel)
Suggested-by: NDaniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: NDaniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: NMichel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180406093145.14389-1-mika.kuoppala@linux.intel.com

The bits used to reset the different engines/domains have changed in
GEN11, this patch maps the reset engine mask bits with the new bits
in the reset control register.

v2: Use shift-left instead of BIT macro to match the file style (Paulo).
v3: Reuse gen8_reset_engines (Daniele).
v4: Do not call intel_uncore_forcewake_reset after reset, we may be
using the forcewake to read protected registers elsewhere and those
results may be clobbered by the concurrent dropping of forcewake.

bspec: 19212
Cc: Oscar Mateo <oscar.mateo@intel.com>
Cc: Antonio Argenziano <antonio.argenziano@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Acked-by: NDaniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: NMichel Thierry <michel.thierry@intel.com>
Reviewed-by: NOscar Mateo <oscar.mateo@intel.com>
Signed-off-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180405140052.10682-1-mika.kuoppala@linux.intel.com

Now that "DOC: User command execution" of i915_gem_execbuffer.c is included
in the i915.rst, it is benecifial (for new developers) to read what happens
at the bottom of the driver stack (in terms of bytes written to be read
by the GPU) when processing a user-space batchbuffer.

v5:
  Typo correction of lacking double tick.
Signed-off-by: NKevin Rogovin <kevin.rogovin@intel.com>
Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
[Joonas: correcting the patch title]
Signed-off-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523001957-6427-4-git-send-email-kevin.rogovin@intel.com

Add the documentation of "DOC: User command execution" of
i915_gem_execbuffer.c into a new section in i915.rst.
Signed-off-by: NKevin Rogovin <kevin.rogovin@intel.com>
Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
[Joonas: correcting the patch title]
Signed-off-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523001957-6427-3-git-send-email-kevin.rogovin@intel.com

Add a narration to i915.rst about Intel GEN GPU's: engines,
driver context and relocation. Also do minor reorder to improve
narration.

v5:
  More type fixes.
  Flow bullet list so lines are not too long.
Signed-off-by: NKevin Rogovin <kevin.rogovin@intel.com>
Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com>
[Joonas: correcting the patch title]
Signed-off-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523001957-6427-2-git-send-email-kevin.rogovin@intel.com

We don't handle resetting the kernel context very well, or presumably any
context executing its breadcrumb commands in the ring as opposed to the
batchbuffer and flush. If we trigger a device reset twice in quick
succession while the kernel context is executing, we may end up skipping
the breadcrumb.  This is really only a problem for the selftest as
normally there is a large interlude between resets (hangcheck), or we
focus on resetting just one engine and so avoid repeatedly resetting
innocents.

Something to try would be a preempt-to-idle to quiesce the engine before
reset, so that innocent contexts would be spared the reset.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
CC: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180330131801.18327-1-chris@chris-wilson.co.uk

On Apollolake, with stress test warm reboot, audio card was not getting
enumerated after reboot. This was a spurious issue happening on
Apollolake. HW codec and HD audio controller link was going out of sync
for which there was a fix in i915 driver but was not getting invoked for
BXT. Extending this fix to BXT as well.

Tested on apollolake chromebook by stress test warm reboot with 2500
iterations.

Bspec: 21829
Signed-off-by: NGaurav K Singh <gaurav.k.singh@intel.com>
Reviewed-by: NDhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1522946544-11524-1-git-send-email-gaurav.k.singh@intel.com

Static code analysis tool reported memory leak in
intel_hdcp_auth_downstream. Fixing the memory leak.

v2: Rebase, move free to a cleanup label(Jani)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: NRadhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: NAnusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180404225957.7457-1-radhakrishna.sripada@intel.com

If we skip the intel_prepare_reset(), we should also skip the
intel_display_reset(). If we we use a flag set by intel_prepare_reset()
then we do not have to second guess based on external user controlled
state whether or not the prepare was called before deciding to finish
it after the reset. igt/gem_eio is one such example that may tweak
i915.reset faster than the code is expecting, leading to

[  190.233528] =====================================
[  190.233534] WARNING: bad unlock balance detected!
[  190.233540] 4.16.0-rc7-g335ef9849310-drmtip_10+ #1 Tainted: G     U
[  190.233547] -------------------------------------
[  190.233553] gem_eio/1348 is trying to release lock (crtc_ww_class_acquire) at:
[  190.233569] [<ffffffff895c7810>] drm_modeset_acquire_fini+0x0/0x60
[  190.233575] but there are no more locks to release!
[  190.233580]
               other info that might help us debug this:
[  190.233588] 3 locks held by gem_eio/1348:
[  190.233592]  #0:  (&f->f_pos_lock){+.+.}, at: [<00000000ab90c784>] __fdget_pos+0x3a/0x50
[  190.233607]  #1:  (sb_writers#11){.+.+}, at: [<00000000e1529265>] vfs_write+0x188/0x1a0
[  190.233622]  #2:  (&attr->mutex){+.+.}, at: [<0000000011f40afe>] simple_attr_write+0x36/0xd0
[  190.233635]
               stack backtrace:
[  190.233644] CPU: 0 PID: 1348 Comm: gem_eio Tainted: G     U           4.16.0-rc7-g335ef9849310-drmtip_10+ #1
[  190.233655] Hardware name: Dell Inc.                 OptiPlex GX280               /0G8310, BIOS A04 02/09/2005
[  190.233664] Call Trace:
[  190.233674]  dump_stack+0x67/0x95
[  190.233682]  ? drm_modeset_backoff+0x1b0/0x1b0
[  190.233690]  print_unlock_imbalance_bug+0xd2/0xe0
[  190.233698]  ? drm_modeset_backoff+0x1b0/0x1b0
[  190.233704]  lock_release+0x23e/0x300
[  190.233712]  drm_modeset_acquire_fini+0x16/0x60
[  190.233835]  intel_finish_reset+0x72/0x160 [i915]
[  190.233894]  i915_reset_device+0x1e9/0x240 [i915]
[  190.233953]  ? __intel_get_crtc_scanline+0x1c0/0x1c0 [i915]
[  190.233962]  ? work_on_cpu_safe+0x50/0x50
[  190.234020]  i915_handle_error+0x1f2/0x470 [i915]
[  190.234031]  ? __might_fault+0x39/0x90
[  190.234037]  ? __might_fault+0x39/0x90
[  190.234099]  i915_wedged_set+0x7f/0xc0 [i915]
[  190.234107]  simple_attr_write+0xb0/0xd0
[  190.234117]  full_proxy_write+0x51/0x80
[  190.234125]  __vfs_write+0x21/0x140
[  190.234133]  ? rcu_read_lock_sched_held+0x6f/0x80
[  190.234140]  ? rcu_sync_lockdep_assert+0x29/0x50
[  190.234147]  ? __sb_start_write+0x152/0x1f0
[  190.234152]  ? __sb_start_write+0x168/0x1f0
[  190.234159]  vfs_write+0xbd/0x1a0
[  190.234166]  SyS_write+0x40/0xa0
[  190.234173]  ? do_syscall_64+0x19/0x1b0
[  190.234180]  do_syscall_64+0x6b/0x1b0
[  190.234188]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[  190.234196] RIP: 0033:0x7f84c1b392b7
[  190.234201] RSP: 002b:00007f84b6755b00 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
[  190.234211] RAX: ffffffffffffffda RBX: 0000000000000046 RCX: 00007f84c1b392b7
[  190.234218] RDX: 0000000000000002 RSI: 000055ec20abc8d6 RDI: 0000000000000046
[  190.234225] RBP: 000055ec20abc8d6 R08: 0000000000000000 R09: 0000000000000000
[  190.234231] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
[  190.234238] R13: 0000000000000000 R14: 00007f84b0000b20 R15: 000055ec20ce4eb8

Testcase: igt/gem_eio
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180405123714.3638-1-chris@chris-wilson.co.uk