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Factor out a function to check for 128b/132b channel coding support used
by a follow-up patch in the patchset.
v2: s/drm_dp_uhbr_channel_coding_supported()/drm_dp128b132b_supported()
(Jani)
Cc: dri-devel@lists.freedesktop.org
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Manasi Navare <navaremanasi@chromium.org>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240417141936.457796-1-imre.deak@intel.com
- Fix documentation of DP tunnel functions (Imre)
- DP MST read sideband messaging cap (Jani)
- Preparation patches for Adaptive Sync SDP Support for DP (Mitul)
Driver Changes:
i915 core (non-display):
- Documentation improvements (Nirmoy)
- Add includes for BUG_ON/BUILD_BUG_ON in i915_memcpy.c (Joonas)
- Do not print 'pxp init failed with 0' when it succeed (Jose)
- Clean-up, including removal of dead code for unsupported platforms (Lucas)
- Adding new DG2 PCI ID (Ravi)
{i915,xe} display:
- Spelling fix (Colin Ian)
- Document CDCLK components (Gustavo)
- Lunar Lake display enabling, including cdclk and other refactors (Gustavo, Bala)
- BIOS/VBT/opregion related refactor (Jani, Ville, RK)
- Save a few bytes of memory using {kstrdup,kfree}_const variant (Christophe)
- Digital port related refactor/clean-up (Ville)
- Fix 2s boot time regression on DP panel replay init (Animesh)
- Remove redundant drm_rect_visible() overlay use (Arthur)
- DSC HW state readout fixes (Imre)
- Remove duplication on audio enable/disable on SDVO and g4x+ DP (Ville)
- Disable AuxCCS framebuffers if built for Xe (Juha-Pekka)
- Fix DSI init order (Ville)
- DRRS related refactor and fixes (Bhanuprakash)
- Fix DSB vblank waits with VRR (Ville)
- General improvements on register name and use of REG_BIT (Ville)
- Some display power well related improvements (Ville)
- FBC changes for better w/a handling (Ville)
- Make crtc disable more atomic (Ville)
- Fix hwmon locking inversion in sysfs getter (Janusz)
- Increase DP idle pattern wait timeout to 2ms (Shekhar)
- PSR related fixes and improvents (Jouni)
- Start using container_of_const() for some extra const safety (Ville)
- Use drm_printer more on display code (Ville)
- Fix Jasper Lake boot freeze (Jonathon)
- Update Pipe src size check in skl_update_scaler (Ankit)
- Enable MST mode for 128b/132b single-stream sideband (Jani)
- Pass encoder around more for port/phy checks (Jani)
- Some initial work to make display code more independent from i915 (Jani)
- Pre-populate the cursor physical dma address (Ville)
- Do not bump min backlight brightness to max on enable (Gareth)
- Fix MTL supported DP rates - removal of UHBR13.5 (Arun)
- Fix the computation for compressed_bpp for DISPLAY < 1 (Ankit)
- Bigjoiner modeset sequence redesign and MST support (Ville)
- Enable Adaptive Sync SDP Support for DP (Mitul)
- Implemnt vblank sycnhronized mbus joining changes (Ville, Stanislav)
- HDCP related fixes (Suraj)
- Fix i915_display_info debugfs when connectors are not active (Ville)
- Clean up on Xe compat layer (Jani)
- Add jitter WAs for MST/FEC/DSC links (Imre)
- DMC wakelock implementation (Luca)
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Merge tag 'drm-intel-next-2024-04-17-1' of https://anongit.freedesktop.org/git/drm/drm-intel into drm-next
Core Changes (DRM):
- Fix documentation of DP tunnel functions (Imre)
- DP MST read sideband messaging cap (Jani)
- Preparation patches for Adaptive Sync SDP Support for DP (Mitul)
Driver Changes:
i915 core (non-display):
- Documentation improvements (Nirmoy)
- Add includes for BUG_ON/BUILD_BUG_ON in i915_memcpy.c (Joonas)
- Do not print 'pxp init failed with 0' when it succeed (Jose)
- Clean-up, including removal of dead code for unsupported platforms (Lucas)
- Adding new DG2 PCI ID (Ravi)
{i915,xe} display:
- Spelling fix (Colin Ian)
- Document CDCLK components (Gustavo)
- Lunar Lake display enabling, including cdclk and other refactors (Gustavo, Bala)
- BIOS/VBT/opregion related refactor (Jani, Ville, RK)
- Save a few bytes of memory using {kstrdup,kfree}_const variant (Christophe)
- Digital port related refactor/clean-up (Ville)
- Fix 2s boot time regression on DP panel replay init (Animesh)
- Remove redundant drm_rect_visible() overlay use (Arthur)
- DSC HW state readout fixes (Imre)
- Remove duplication on audio enable/disable on SDVO and g4x+ DP (Ville)
- Disable AuxCCS framebuffers if built for Xe (Juha-Pekka)
- Fix DSI init order (Ville)
- DRRS related refactor and fixes (Bhanuprakash)
- Fix DSB vblank waits with VRR (Ville)
- General improvements on register name and use of REG_BIT (Ville)
- Some display power well related improvements (Ville)
- FBC changes for better w/a handling (Ville)
- Make crtc disable more atomic (Ville)
- Fix hwmon locking inversion in sysfs getter (Janusz)
- Increase DP idle pattern wait timeout to 2ms (Shekhar)
- PSR related fixes and improvents (Jouni)
- Start using container_of_const() for some extra const safety (Ville)
- Use drm_printer more on display code (Ville)
- Fix Jasper Lake boot freeze (Jonathon)
- Update Pipe src size check in skl_update_scaler (Ankit)
- Enable MST mode for 128b/132b single-stream sideband (Jani)
- Pass encoder around more for port/phy checks (Jani)
- Some initial work to make display code more independent from i915 (Jani)
- Pre-populate the cursor physical dma address (Ville)
- Do not bump min backlight brightness to max on enable (Gareth)
- Fix MTL supported DP rates - removal of UHBR13.5 (Arun)
- Fix the computation for compressed_bpp for DISPLAY < 1 (Ankit)
- Bigjoiner modeset sequence redesign and MST support (Ville)
- Enable Adaptive Sync SDP Support for DP (Mitul)
- Implemnt vblank sycnhronized mbus joining changes (Ville, Stanislav)
- HDCP related fixes (Suraj)
- Fix i915_display_info debugfs when connectors are not active (Ville)
- Clean up on Xe compat layer (Jani)
- Add jitter WAs for MST/FEC/DSC links (Imre)
- DMC wakelock implementation (Luca)
Signed-off-by: Dave Airlie <airlied@redhat.com>
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# gpg: Signature made Wed 17 Apr 2024 23:22:09 AEST
# gpg: using RSA key 6D207068EEDD65091C2CE2A3FA625F640EEB13CA
# gpg: Good signature from "Rodrigo Vivi <rodrigo.vivi@intel.com>" [unknown]
# gpg: aka "Rodrigo Vivi <rodrigo.vivi@gmail.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 6D20 7068 EEDD 6509 1C2C E2A3 FA62 5F64 0EEB 13CA
From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/Zh_Q72gYKMMbge9A@intel.com
Add structure representing Adaptive Sync Secondary Data Packet (AS SDP).
Also, add Adaptive Sync SDP logging in drm_dp_helper.c to facilitate
debugging.
--v2:
- Update logging. [Jani, Ankit]
- Use 'as_sdp' instead of 'async' [Ankit]
- Correct define placeholders to where they are actually used. [Jani]
- Update members in 'as_sdp' structure to make it uniform. [Jani]
--v3:
- Added changes to dri-devel mailing list. No code changes.
--v4:
- Instead of directly using operation mode, use an enum to accommodate
all operation modes (Ankit).
--v5:
Nit-pick changes to commit message.
--v6:
- Add correct place holder and name change for AS_SDP_OP_MODE.
- Separate i915 changes from drm changes.
- Remove extra lines.
--v7:
- Add drm/dp in subject line (Ankit)
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240322031157.3823909-3-mitulkumar.ajitkumar.golani@intel.com
Add an API that indicates support for Adaptive Sync SDP in
the sink, which can be utilized by the rest of the DP programming.
--v1:
- Format commit message properly.
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240322031157.3823909-2-mitulkumar.ajitkumar.golani@intel.com
While most display helpers Kconfig symbols have the DRM_DISPLAY prefix,
the DisplayPort CEC tunnelling implementation uses CONFIG_DRM_DISPLAY_DP_AUX_CEC.
Since the number of users is limited, we can easily rename it to make it
consistent.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20240327-kms-kconfig-helpers-v3-4-eafee11b84b3@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>
In response to my patch removing the "wait for HPD" logic at the
beginning of the MSM DP transfer() callback [1], we had some debate
about what the "This is an optional function" meant in the
documentation of the wait_hpd_asserted() callback. Let's clarify.
As talked about in the MSM DP patch [1], before wait_hpd_asserted()
was introduced there was no great way for panel drivers to wait for
HPD in the case that the "built-in" HPD signal was used. Panel drivers
could only wait for HPD if a GPIO was used. At the time, we ended up
just saying that if we were using the "built-in" HPD signal that DP
AUX controllers needed to wait for HPD themselves at the beginning of
their transfer() callback. The fact that the wait for HPD at the
beginning of transfer() was awkward/problematic was the whole reason
wait_hpd_asserted() was added.
Let's make it obvious that if a DP AUX controller implements
wait_hpd_asserted() that they don't need a loop waiting for HPD at the
start of their transfer() function. We'll still allow DP controllers
to work the old way but mark it as deprecated.
[1] https://lore.kernel.org/r/20240315143621.v2.3.I535606f6d4f7e3e5588bb75c55996f61980183cd@changeid
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240319135836.v2.1.I521dad0693cc24fe4dd14cba0c7048d94f5b6b41@changeid
If an eDP panel is not powered on then any attempts to talk to it over
the DP AUX channel will timeout. Unfortunately these attempts may be
quite slow. Userspace can initiate these attempts either via a
/dev/drm_dp_auxN device or via the created i2c device.
Making the DP AUX drivers timeout faster is a difficult proposition.
In theory we could just poll the panel's HPD line in the AUX transfer
function and immediately return an error there. However, this is
easier said than done. For one thing, there's no hard requirement to
hook the HPD line up for eDP panels and it's OK to just delay a fixed
amount. For another thing, the HPD line may not be fast to probe. On
parade-ps8640 we need to wait for the bridge chip's firmware to boot
before we can get the HPD line and this is a slow process.
The fact that the transfers are taking so long to timeout is causing
real problems. The open source fwupd daemon sometimes scans DP busses
looking for devices whose firmware need updating. If it happens to
scan while a panel is turned off this scan can take a long time. The
fwupd daemon could try to be smarter and only scan when eDP panels are
turned on, but we can also improve the behavior in the kernel.
Let's let eDP panels drivers specify that a panel is turned off and
then modify the common AUX transfer code not to attempt a transfer in
this case.
Tested-by: Steev Klimaszewski <steev@kali.org>
Reviewed-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Eizan Miyamoto <eizan@chromium.org>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240202141109.1.I24277520ac754ea538c9b14578edc94e1df11b48@changeid
Copy intel_dp_max_data_rate() to DRM core. It will be needed by a
follow-up DP tunnel patch, checking the maximum rate the DPRX (sink)
supports. Accordingly use the drm_dp_max_dprx_data_rate() name for
clarity. This patchset will also switch calling the new DRM function
in i915 instead of intel_dp_max_data_rate().
While at it simplify the function documentation/comments, removing
parts described already by drm_dp_bw_channel_coding_efficiency().
v2: (Ville)
- Remove max_link_rate_kbps.
- Simplify the function documentation.
v3:
- Rebased on latest drm-tip.
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240226185246.1276018-1-imre.deak@intel.com
YUV420 format is supported only in the VSC SDP packet and not through
MSA. Hence add an API which indicates the sink support which can be used
by the rest of the DP programming.
changes in v5:
- rebased on top of drm-tip
changes in v4:
- bail out early if dpcd rev check fails
changes in v3:
- fix the commit title prefix to drm/dp
- get rid of redundant !!
- break out this change from series [1] to get acks from drm core
maintainers
Changes in v2:
- Move VSC SDP support check API from dp_panel.c to
drm_dp_helper.c
[1]: https://patchwork.freedesktop.org/series/129180/
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Paloma Arellano <quic_parellan@quicinc.com>
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240215191556.3227259-1-quic_abhinavk@quicinc.com
Currently the size parameter of drm_dp_vsc_sdp_pack() is always
the size of struct dp_sdp. Hence lets drop this parameter and
use sizeof() directly.
Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240220195348.1270854-2-quic_abhinavk@quicinc.com
intel_dp_vsc_sdp_pack() can be re-used by other DRM drivers as well.
Lets move this to drm_dp_helper to achieve this.
changes in v2:
- rebased on top of drm-tip
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240220195348.1270854-1-quic_abhinavk@quicinc.com
The current way of calculating the pbn_div value, the link BW per each
MTP slot, worked only for DP 1.4 link rates. Fix things up for UHBR
rates calculating with the correct channel coding efficiency based on
the link rate.
v2:
- Return the fractional pbn_div value from drm_dp_get_vc_payload_bw().
v3:
- Fix rounding up quotient while calculating req_slots. (Ville)
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231117150929.1767227-1-imre.deak@intel.com
Add helpers drivers can use to calculate the BW allocation overhead -
due to SSC, FEC, DSC and data alignment on symbol cycles - and the
channel coding efficiency - due to the 8b/10b, 128b/132b encoding. On
128b/132b links the FEC overhead is part of the coding efficiency, so
not accounted for in the BW allocation overhead.
The drivers can use these functions to calculate a ratio, controlling
the stream symbol insertion rate of the source device in each SST TU
or MST MTP frame. Drivers can calculate this
m/n = (pixel_data_rate * drm_dp_bw_overhead()) /
(link_data_rate * drm_dp_bw_channel_coding_efficiency())
ratio for a given link and pixel stream and with that the
slots_per_mtp = CEIL(64 * m / n)
allocated slots per MTP for the stream in a link frame and with
that the
pbn = slots_per_mtp * drm_mst_get_pbn_divider()
allocated PBNs for the stream on the MST link path.
Take drm_dp_bw_overhead() into use in drm_dp_calc_pbn_mode(), for
drivers calculating the PBN value directly.
v2:
- Add dockbook description to drm_dp_bw_channel_coding_efficiency().
(LKP).
- Clarify the way m/n ratio is calculated in the commit log.
v3:
- Fix compile breakage for !CONFIG_BACKLIGHT_CLASS_DEVICE. (LKP)
- Account for FEC_PM overhead (+ 0.0015625 %), add comment
with the formula to calculate the total FEC overhead. (Ville)
v4:
- Rename DRM_DP_OVERHEAD_SSC to DRM_DP_OVERHEAD_SSC_REF_CLK. (Ville)
v5:
- Clarify in the commit log what MTP means.
- Simplify the commit log's formula to calculate PBN.
Cc: Lyude Paul <lyude@redhat.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: kernel test robot <lkp@intel.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> (v2)
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231107001505.3370108-1-imre.deak@intel.com
Add a quirk for Synaptics MST hubs, which require a workaround - at leat
on i915 - for some modes, on which the hub applies HBLANK expansion.
These modes will only work by enabling DSC decompression for them, a
follow-up patch will do this in i915.
v2:
- Fix the quirk name in its DocBook description.
Cc: Lyude Paul <lyude@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231030155843.2251023-9-imre.deak@intel.com
Connectors have source physical address available in display
info. There's no need to parse the EDID again for this. Add
drm_dp_cec_attach() to do this.
Seems like the set_edid/unset_edid naming is a bit specific now that
there's no need to pass the EDID at all, so aim for attach/detach going
forward.
v2: Fix the embarrashing build failures
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: linux-media@vger.kernel.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230825130120.1250089-1-jani.nikula@intel.com
The operator precedence between << and & is wrong, leading to the high
byte being completely ignored. For example, with the 6.4 format, 32
becomes 0 and 24 becomes 8. Fix it, and remove the slightly confusing
and unnecessary DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT macro while at it.
Fixes: 0575650077ea ("drm/dp: DRM DP helper/macros to get DP sink DSC parameters")
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: Manasi Navare <navaremanasi@google.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: <stable@vger.kernel.org> # v5.0+
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230406134615.1422509-1-jani.nikula@intel.com
Add helper to check if the DP sink supports DSC with the given
o/p format.
v2: Add documentation for the helper. (Uma Shankar)
v3: /** instead of /* (Uma Shankar)
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230309062855.393087-2-suraj.kandpal@intel.com
Add a helper for getting the DP PHY name. In the interest of caller
simplicity and to avoid allocations and passing in of buffers, duplicate
the const strings to return. It's a minor penalty to pay for simplicity
in all the call sites.
v2: Rebase, add kernel-doc, ensure non-NULL always
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b08dc12a7e621a48ec35546d6cd1ed4b1434810d.1660553850.git.jani.nikula@intel.com
When doing DP AUX transfers there are two actors that need to be
powered in order for the DP AUX transfer to work: the DP source and
the DP sink. Commit bacbab58f09d ("drm: Mention the power state
requirement on side-channel operations") added some documentation
saying that the DP source is required to power itself up (if needed)
to do AUX transfers. However, that commit doesn't talk anything about
the DP sink.
For full fledged DP the sink isn't really a problem. It's expected
that if an external DP monitor isn't plugged in that attempting to do
AUX transfers won't work. It's also expected that if a DP monitor is
plugged in (and thus asserting HPD) then AUX transfers will work.
When we're looking at eDP, however, things are less obvious. Let's add
some documentation about expectations. Here's what we'll say:
1. We don't expect the DP AUX transfer function to power on an eDP
panel. If an eDP panel is physically connected but powered off then it
makes sense for the transfer to fail.
2. We'll document that the official way to power on a panel is via the
bridge chain, specifically by making sure that the panel's prepare
function has been called (which is called by
panel_bridge_pre_enable()). It's already specified in the kernel doc
of drm_panel_prepare() that this is the way to power the panel on and
also that after this call "it is possible to communicate with any
integrated circuitry via a command bus."
3. We'll also document that for code running in the panel driver
itself that it is legal for the panel driver to power itself up
however it wants (it doesn't need to officially call
drm_panel_pre_enable()) and then it can do AUX bus transfers. This is
currently the way that edp-panel works when it's running atop the DP
AUX bus.
NOTE: there was much discussion of all of this in response to v1 [1]
of this patch. A summary of that is:
* With the Intel i195 driver, apparently eDP panels do get powered
up. We won't forbid this but it is expected that code that wants to
run on a variety of platforms should ensure that the drm_panel's
prepare() function has been called.
* There is at least a reasonable amount of agreement that the
transfer() functions itself shouldn't be responsible for powering
the panel. It's proposed that if we need the DP AUX dev nodes to be
robust for eDP that the code handling the DP AUX dev nodes could
handle powering the panel by ensuring that the panel's prepare()
call was made. Potentially drm_dp_aux_dev_get_by_minor() could be a
good place to do this. This is left as a future exercise. Until
that's fixed the DP AUX dev nodes for eDP are probably best just
used for debugging.
* If a panel could be in PSR and DP AUX via the dev node needs to be
reliable then we need to be able to pull the panel out of PSR. On
i915 this is also apparently handled as part of the transfer()
function.
[1] https://lore.kernel.org/r/20220503162033.1.Ia8651894026707e4fa61267da944ff739610d180@changeid
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220509161733.v2.1.Ia8651894026707e4fa61267da944ff739610d180@changeid
Move DisplayPort protocol constants and structures into the new
header drm_dp.h, which can be used by DRM core components. The
existing header drm_dp_helper.h now only contains helper code for
graphics drivers. No functional changes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220421073108.19226-5-tzimmermann@suse.de
Rename dp/ to display/ to account for additional display-related
helpers, such as HDMI. Update all related include statements. No
functional changes.
Various drivers, such as i915 and amdgpu, use similar naming scheme
by putting code for video-output standards into a local display/
directory. The new directory's name is aligned with this convention.
v2:
* update commit message (Javier)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220421073108.19226-3-tzimmermann@suse.de
