This is a superset of the current i2c_dp_aux bus functionality and can
be used to transfer native AUX in addition to I2C-over-AUX messages.

Helpers are provided to read and write the DPCD, either blockwise or
byte-wise. Many of the existing helpers for DisplayPort take a copy of a
portion of the DPCD and operate on that, without a way to write data
back to the DPCD (e.g. for configuration of the link).

Subsequent patches will build upon this infrastructure to provide common
functionality in a generic way.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NJani Nikula <jani.nikula@intel.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>
---
Changes in v5:
- move comments partially to struct drm_dp_aux_msg in header file
- return -EPROTO on short reads in DPCD helpers

Changes in v4:
- fix a typo in a comment

Changes in v3:
- reorder drm_dp_dpcd_writeb() arguments to be more intuitive
- return number of bytes transferred in drm_dp_dpcd_write()
- factor out drm_dp_dpcd_access()
- describe error codes

  - DP_TEST_LINK_PATTERN is ambiguous, rename to DP_TEST_LINK_VIDEO_PATTERN to clarify
  - Added DP_TEST_LINK_FAUX_PATTERN to support automated testing of Fast AUX
Signed-off-by: NTodd Previte <tprevite@gmail.com>
Reviewed-by: NJani Nikula <jani.nikula@intel.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

The current values seem to be defined in a format that's specific to the
i915, gma500 and radeon drivers. To make this more generally useful, use
the values as defined in the specification.

While at it, prefix the constants with DP_ for improved namespacing.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

None of the DP DPCD helpers need to modify the DPCD.
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Detailed cap info at address 80h is not available with DPCD ver
1.0. Whether such devices exist in the wild I don't know, but there
should be no harm done in having the defines for downstream port 0 in
address 05h.
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Reviewed-by: NTodd Previte <tprevite@gmail.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

SDP header and SDP VSC header as per eDP 1.3 spec, section 3.5,
chapter "PSR Secondary Data Package Support".

v2: Modified and corrected the structures to be more in line for
kernel coding guidelines and rebased the code on Paulo's DP patchset
v3: removing unecessary identation at DP_RECEIVER_CAP_SIZE
v4: moving them to include/drm/drm_dp_helper.h and also already
    icluding EDP_PSR_RECEIVER_CAP_SIZE to add everything needed
    for PSR at once at drm_dp_helper.h
v5: Fix SDP VSC header and identation by (Paulo Zanoni) and
    remove i915 from title (Daniel Vetter)
v6: Fix spec version and move comments from code to commit message
    since numbers might change in the future (by Paulo Zanoni).

CC: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NSateesh Kavuri <sateesh.kavuri@intel.com>
Signed-off-by: NShobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: NRodrigo Vivi <rodrigo.vivi@gmail.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

I didn't bother with documenting the really trivial new "extract
something from dpcd" helpers, but the i2c over aux ch is now
documented a bit.

v2: Clarify the comment for i2c_dp_aux_add_bus a bit.

v3: Fix more spelling fail spotted by Laurent Pinchart.
Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

This requires a few changes since that dpcd value is above the
range currently cached by radeon. I've check the dp specs, and
above 0xf there's a big gap and nothing that looks like we should
cache it while a given device is plugged in. It's also the same value
that i915.ko uses.

Hence extend the various dpcd arrays in the radeon driver, use
proper symbolic constants where applicable (one place overallocated
the dpcd array to 25 bytes). Then also drop the rd_interval cache -
radeon_dp_link_train_init re-reads the dpcd block, so the values we'll
consume in train_cr and train_ce will always be fresh.

To avoid needless diff-churn, #define the old size of dpcd as the new
one and keep it around.

v2: Alex Deucher noticed one place where I've forgotten to replace 8
with DP_RECEIVER_CAP_SIZE.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Safe for the minor difference that the intel versions get an offset
into the link_status as an argument, both are the same again.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

radeon and intel use the exact same definition.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Acked-by: NDave Airlie <airlied@gmail.com>

v2: Kill 2 more helpers in intel_dp.c that I've missed.
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

radeon and intel use the exact same definition.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Signed-off-by: NAdam Jackson <ajax@redhat.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Note with a comment anything newer than DP 1.1a.

Obviously this needs some work still...
Signed-off-by: NAdam Jackson <ajax@redhat.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Sources: DP, eDP, and DP interop specs, and a VESA slideshow about DP
1.2 for the MST bits.
Tested-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NAdam Jackson <ajax@redhat.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: NJani Nikula <jani.nikula@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Signed-off-by: NAdam Jackson <ajax@redhat.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Note with a comment anything newer than DP 1.1a.

Obviously this needs some work still...
Signed-off-by: NAdam Jackson <ajax@redhat.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Sources: DP, eDP, and DP interop specs, and a VESA slideshow about DP
1.2 for the MST bits.
Tested-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NAdam Jackson <ajax@redhat.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: NJani Nikula <jani.nikula@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Low four bits are downstream port count.  High bit indicates peer OUI
support.  OUI matching will allow us to do additional per-sink handling
for things like DP->VGA bandwidth limits or (hopefully) the iMac-as-
display hack.
Signed-off-by: NAdam Jackson <ajax@redhat.com>
Reviewed-by: NJerome Glisse <jglisse@redhat.com>
Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

DisplayPort has an escape hatch by which sources and sinks can identify
each other.  We would prefer not to notice this, but I suspect we're
going to need to.
Signed-off-by: NAdam Jackson <ajax@redhat.com>
Reviewed-by: NJerome Glisse <jglisse@redhat.com>
Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

This should make eDP more reliable.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@kernel.org
Signed-off-by: NDave Airlie <airlied@redhat.com>

DPCD 1.1+ adds some automated test infrastructure support.  Add support
for reading the IRQ source and jumping to a test handling routine if
needed.  Subsequent patches will handle particular tests; this patch
just ACKs any requested tests by default.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NKeith Packard <keithp@keithp.com>

Add the addresses and definitions I care about for Panel Self Refresh, as
documented in the eDP spec.

I'm sending these out before some other patches because this should be a fairly
simple one to get upstream and not require too much fuss (where the others may
have some fuss).

This file is a mess with white spacing. I tried to stay consistent with the
surrounding code.

v2: had some silly mistakes in v1 which Keith caught

Cc: Dave Airlie <airlied@redhat.com>
Cc: Keith Packard <keithp@keithp.com>
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NKeith Packard <keithp@keithp.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

We need to use some of these values in eDP configurations, so be sure to
fetch them and store them in the i915 private structure.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

- dpcp -> dpcd
- fix up dig encoder routing
- aux transaction table takes delay in 10 usec units
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

This is enough to retrieve EDID and DPCP.
Signed-off-by: NDave Airlie <airlied@redhat.com>

Both radeon and nouveau can re-use this code so move it up a level
so they can. However the hw interfaces for aux ch are different
enough that the code to translate from mode, address, bytes
to actual hw interfaces isn't generic, so move that code into the
Intel driver.
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NKeith Packard <keithp@keithp.com>