linux.git/include/drm/display, branch v6.12.80

drm/dp_mst: Fix drm RAD print

2025-04-10T12:39:13+00:00

[ Upstream commit 6bbce873a9c97cb12f5455c497be279ac58e707f ]

[Why]
The RAD of sideband message printed today is incorrect.
For RAD stored within MST branch
- If MST branch LCT is 1, it's RAD array is untouched and remained as 0.
- If MST branch LCT is larger than 1, use nibble to store the up facing
  port number in cascaded sequence as illustrated below:

  u8 RAD[0] = (LCT_2_UFP << 4) | LCT_3_UFP
     RAD[1] = (LCT_4_UFP << 4) | LCT_5_UFP
     ...

In drm_dp_mst_rad_to_str(), it wrongly to use BIT_MASK(4) to fetch the port
number of one nibble.

[How]
Adjust the code by:
- RAD array items are valuable only for LCT >= 1.
- Use 0xF as the mask to replace BIT_MASK(4)

V2:
- Document how RAD is constructed (Imre)

V3:
- Adjust the comment for rad[] so kdoc formats it properly (Lyude)

Fixes: 2f015ec6eab6 ("drm/dp_mst: Add sideband down request tracing + selftests")
Cc: Imre Deak 
Cc: Ville Syrjälä 
Cc: Harry Wentland 
Cc: Lyude Paul 
Reviewed-by: Lyude Paul 
Signed-off-by: Wayne Lin 
Signed-off-by: Lyude Paul 
Link: https://patchwork.freedesktop.org/patch/msgid/20250113091100.3314533-2-Wayne.Lin@amd.com
Signed-off-by: Sasha Levin

drm: Fix DSC BPP increment decoding

2025-02-21T13:01:21+00:00

[ Upstream commit e00a2e5d485faf53c7a24b9d1b575a642227947f ]

Starting with DPCD version 2.0 bits 6:3 of the DP_DSC_BITS_PER_PIXEL_INC
DPCD register contains the NativeYCbCr422_MAX_bpp_DELTA field, which can
be non-zero as opposed to earlier DPCD versions, hence decoding the
bit_per_pixel increment value at bits 2:0 in the same register requires
applying a mask, do so.

Cc: Ankit Nautiyal 
Fixes: 0c2287c96521 ("drm/display/dp: Add helper function to get DSC bpp precision")
Reviewed-by: Jani Nikula 
Signed-off-by: Imre Deak 
Link: https://patchwork.freedesktop.org/patch/msgid/20250212161851.4007005-1-imre.deak@intel.com
Signed-off-by: Sasha Levin

drm/dp_mst: Fix resetting msg rx state after topology removal

2024-12-14T19:03:28+00:00

commit a6fa67d26de385c3c7a23c1e109a0e23bfda4ec7 upstream.

If the MST topology is removed during the reception of an MST down reply
or MST up request sideband message, the
drm_dp_mst_topology_mgr::up_req_recv/down_rep_recv states could be reset
from one thread via drm_dp_mst_topology_mgr_set_mst(false), racing with
the reading/parsing of the message from another thread via
drm_dp_mst_handle_down_rep() or drm_dp_mst_handle_up_req(). The race is
possible since the reader/parser doesn't hold any lock while accessing
the reception state. This in turn can lead to a memory corruption in the
reader/parser as described by commit bd2fccac61b4 ("drm/dp_mst: Fix MST
sideband message body length check").

Fix the above by resetting the message reception state if needed before
reading/parsing a message. Another solution would be to hold the
drm_dp_mst_topology_mgr::lock for the whole duration of the message
reception/parsing in drm_dp_mst_handle_down_rep() and
drm_dp_mst_handle_up_req(), however this would require a bigger change.
Since the fix is also needed for stable, opting for the simpler solution
in this patch.

Cc: Lyude Paul 
Cc: 
Fixes: 1d082618bbf3 ("drm/display/dp_mst: Fix down/up message handling after sink disconnect")
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/13056
Reviewed-by: Lyude Paul 
Signed-off-by: Imre Deak 
Link: https://patchwork.freedesktop.org/patch/msgid/20241203160223.2926014-2-imre.deak@intel.com
Signed-off-by: Greg Kroah-Hartman

Merge tag 'drm-misc-next-2024-08-29' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

2024-08-30T03:40:38+00:00

drm-misc-next for v6.12:

UAPI Changes:

devfs:
- support device numbers up to MINORBITS limit

Core Changes:

ci:
- increase job timeout

devfs:
- use XArray for minor ids

displayport:
- mst: GUID improvements

docs:
- add fixes and cleanups

panic:
- optionally display QR code

Driver Changes:

amdgpu:
- faster vblank disabling
- GUID improvements

gm12u320
- convert to struct drm_edid

host1x:
- fix syncpoint IRQ during resume
- use iommu_paging_domain_alloc()

imx:
- ipuv3: convert to struct drm_edid

omapdrm:
- improve error handling

panel:
- add support for BOE TV101WUM-LL2 plus DT bindings
- novatek-nt35950: improve error handling
- nv3051d: improve error handling
- panel-edp: add support for BOE NE140WUM-N6G; revert support for
  SDC ATNA45AF01
- visionox-vtdr6130: improve error handling; use
  devm_regulator_bulk_get_const()

renesas:
- rz-du: add support for RZ/G2UL plus DT bindings

sti:
- convert to struct drm_edid

tegra:
- gr3d: improve PM domain handling
- convert to struct drm_edid

Signed-off-by: Dave Airlie 

From: Thomas Zimmermann 
Link: https://patchwork.freedesktop.org/patch/msgid/20240829144654.GA145538@linux.fritz.box

drm/mst: switch to guid_t type for GUID

2024-08-29T08:21:25+00:00

The kernel has a guid_t type for GUIDs. Switch to using it, but avoid
any functional changes here.

Reviewed-by: Daniel Vetter 
Acked-by: Harry Wentland 
Acked-by: Alex Deucher 
Acked-by: Hamza Mahfooz 
Link: https://patchwork.freedesktop.org/patch/msgid/20240812122312.1567046-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula

Merge tag 'drm-intel-next-2024-08-13' of https://gitlab.freedesktop.org/drm/i915/kernel into drm-next

2024-08-16T02:56:42+00:00

- Type-C programming fix for MTL+ (Gustavo)
 - Fix display clock workaround (Mitul)
 - Fix DP LTTPR detection (Imre)
 - Calculate vblank delay more accurately (Ville)
 - Make vrr_{enabling,disabling}() usable outside intel_display.c (Ville)
 - FBC clean-up (Ville)
 - DP link-training fixes and clean-up (Imre)
 - Make I2C terminology more inclusive (Easwar)
 - Make read-only array bw_gbps static const (Colin)
 - HDCP fixes and improvements (Suraj)
 - DP VSC SDP fixes and clean-ups (Suraj, Mitul)
 - Fix opregion leak in Xe code (Lucas)
 - Fix possible int overflow in skl_ddi_calculate_wrpll (Nikita)]
 - General display clean-ups and conversion towards intel_display (Jani)
 - On DP MST, Enable LT fallback for UHBR<->non-UHBR rates (Imre)
 - Add VRR condition for DPKGC Enablement (Suraj)
 - Use backlight power constants (Zimmermann)
 - Correct dual pps handling for MTL_PCH+ (Dnyaneshwar)
 - Dump DSC HW state (Imre)
 - Replace double blank with single blank after comma (Andi)
 - Read display register timeout on BMG (Mitul)

Signed-off-by: Dave Airlie 

From: Rodrigo Vivi 
Link: https://patchwork.freedesktop.org/patch/msgid/ZruWsyTv3nzdArDk@intel.com

Merge drm/drm-next into drm-intel-next

2024-08-01T10:06:09+00:00

Sync with v6.11-rc1 in general, and specifically get the new
BACKLIGHT_POWER_ constants for power states.

Signed-off-by: Jani Nikula

drm/dp_mst: Add a helper to queue a topology probe

2024-07-31T15:45:56+00:00

A follow up i915 patch will need to reprobe the MST topology after the
initial probing, add a helper for this.

Cc: Lyude Paul 
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Lyude Paul 
Signed-off-by: Imre Deak 
Link: https://patchwork.freedesktop.org/patch/msgid/20240722165503.2084999-3-imre.deak@intel.com

drm/dp: Describe target_rr_divider in struct drm_dp_as_sdp

2024-07-31T11:13:28+00:00

Describe newly added parameter target_rr_divider in struct
drm_dp_as_sdp.

-v2:
Remove extra line from commit message.(Lucas)

-v3:
Rebase.

Fixes: a20c6d954d75 ("drm/dp: Add refresh rate divider to struct representing AS SDP")
Cc: Mitul Golani 
Cc: Arun R Murthy 
Cc: Suraj Kandpal 
Cc: Ankit Nautiyal 
Cc: Jani Nikula 
Cc: Stephen Rothwell 
Signed-off-by: Mitul Golani 
Reviewed-by: Ankit Nautiyal 
Acked-by: Maarten Lankhorst 
Signed-off-by: Maarten Lankhorst 
Link: https://patchwork.freedesktop.org/patch/msgid/20240715162514.2836421-1-mitulkumar.ajitkumar.golani@intel.com

Merge drm/drm-next into drm-misc-next

2024-07-29T07:35:54+00:00

Backmerging to get a late RC of v6.10 before moving into v6.11.

Signed-off-by: Thomas Zimmermann