linux.git/drivers/gpu/drm/amd/display/dc/dml, branch master

drm/amd/display: Increase fclk change latency on dcn351

2026-08-06T16:42:21+00:00

[Why]
fclk change latency is longer than expected on dcn351.

[How]
Increate fclk change latency from 24us to 32us.

Reviewed-by: Dillon Varone 
Signed-off-by: Sung-huai Wang 
Signed-off-by: Roman Li 
Tested-by: Dan Wheeler 
Signed-off-by: Alex Deucher

drm/amd/display: dispatch compressed FRL cap check inside dml1_frl_cap_chk_inter

2026-07-28T23:17:31+00:00

[why]
DSC over HDMI FRL (e.g. 4k144) was pruned by DML mode support
because the compressed FRL cap check was never reached.

dml32_TruncToValidBPP() validates the FRL output by calling
dml1_frl_cap_chk_inter() directly. The compressed-vs-uncompressed
dispatch (if params->compressed -> dml1_frl_cap_chk_compressed()) had
been moved up into the top-level dml1_frl_cap_chk() wrapper, leaving
dml1_frl_cap_chk_inter() as uncompressed-only. As a result a DSC stream
routed through TruncToValidBPP was validated against the full
uncompressed bandwidth, failed the cap check, and the mode was pruned
(vlevel == num_states).

[how]
Move the compressed dispatch back into dml1_frl_cap_chk_inter() so every
caller of _inter() (including TruncToValidBPP) honours params->compressed.
This matches the internal DAL tree.

Reviewed-by: Harry Wentland 
Signed-off-by: Fangzhi Zuo 
Tested-by: Dan Wheeler 
Signed-off-by: Alex Deucher

drm/amd/display: Fix 4018 warning

2026-07-01T15:16:03+00:00

[Why]
It is required by Security Guidance for All Software Components.

[How]
Change variable type to unsigned in dc\dml\dcn314\display_mode_vba_31.c
and dc\dml\dcn31\display_mode_vba_314.c.
Explicit cast to unsigned in dc\link\protocols\link_hdmi_frl.c.
Move warning from UNSOLVED set to SOLVED set.

Reviewed-by: Dillon Varone 
Signed-off-by: Piotr Maziarz 
Signed-off-by: George Zhang 
Tested-by: Dan Wheeler 
Signed-off-by: Alex Deucher

drm/amd/display: Refactor surface_update_flags to flat struct with helpers

2026-06-17T20:15:51+00:00

[Why]
The union surface_update_flags type uses a union with a raw
uint32_t member to allow bulk clear/set/test operations on the
bitfield. This couples the struct layout to a specific integer
width, breaks when the number of flag bits exceeds 32, and
scatters raw-access patterns across many call sites. Replacing
the union with a plain struct and adding explicit helper
functions makes the intent clearer and prepares the code for
future flag-set expansion.

[How]
Rename union surface_update_flags to struct pipe_update_bits
and remove the union wrapper, the .bits sub-struct, and the
.raw member. Add inline helpers in dc.h:
surface_update_flags_clear(), surface_update_flags_set_full(),
and surface_update_flags_is_any_set() that operate on the new
struct via memset/memcmp. Add stream_update_flags_clear() and
stream_update_flags_set_full() in dc_stream.h for the stream
update flags union. Update all callers: change the type name,
replace .bits.field with .field, replace .raw = 0 with the
clear helper, replace .raw = 0xFFFFFFFF with the set_full
helper, and replace .raw boolean tests with is_any_set.

Reviewed-by: Nicholas Kazlauskas 
Signed-off-by: Rafal Ostrowski 
Signed-off-by: Chenyu Chen 
Tested-by: Daniel Wheeler 
Signed-off-by: Alex Deucher

drm/amd/display: use unsigned types for local pipe and REG_GET counters

2026-06-04T19:24:45+00:00

Two small type fixes that match how the values are actually consumed:

- decide_zstate_support() iterates from 0 to pipe_count, which is
  unsigned. Make the loop index unsigned int.

- hpo_enc401_read_state() reads HDMI_PIXEL_ENCODING and
  HDMI_DEEP_COLOR_DEPTH via REG_GET_2(), which internally casts the
  output pointer to (uint32_t *). Passing the address of an int is a
  strict-aliasing wart even when the sizes match. Declare the locals
  as uint32_t.

No behavioural change since the values are only compared against small
non-negative constants.

Signed-off-by: Aurabindo Pillai 
Reviewed-by: Alex Hung 
Signed-off-by: Alex Deucher

drm/amd/display: add HDMI 2.1 DSC over FRL support

2026-06-03T17:44:59+00:00

Add all the bits to enable DSC over FRL.

Signed-off-by: Harry Wentland 
Reviewed-by: Fangzhi Zuo 
Tested-by: Dan Wheeler 
Signed-off-by: Alex Deucher

drm/amd/display: Add DML changes to support HDMI FRL

2026-06-03T17:44:26+00:00

This adds DML support for HDMI FRL.

Signed-off-by: Harry Wentland 
Reviewed-by: Fangzhi Zuo 
Tested-by: Dan Wheeler 
Signed-off-by: Alex Deucher

drm/amd/display: Add HDMI FRL definitions to includes

2026-06-03T17:44:21+00:00

This patch adds all relevant includes in DC that are
used by the HDMI FRL implementation in DC.

Signed-off-by: Harry Wentland 
Reviewed-by: Fangzhi Zuo 
Tested-by: Dan Wheeler 
Signed-off-by: Alex Deucher

drm/amd/display: Fix warnings

2026-05-11T20:10:34+00:00

[Why & How]
Fix various warnings related to unsigned/signed mismatches
-  Consistently use the same signedness for a given value
-  Explcitly cast between types when needed

Reviewed-by: Dillon Varone 
Signed-off-by: Clay King 
Signed-off-by: James Lin 
Tested-by: Daniel Wheeler 
Signed-off-by: Alex Deucher

drm/amd/display: Fix multiple compiler warnings

2026-05-11T20:10:30+00:00

[Why]
Unreachable Code;
Copy Constructor Deleted;
Local Declaration Hides Parameter;
Local Declaration Hides Outer Scope;
Uninitialized or Suspicious Memory Use.

[How]
- Removed or refactored unreachable code paths
- Ensured proper copy constructors in C++ classes
- Renamed local variables that shadowed function parameters
- Renamed inner loop/block variables to avoid shadowing outer scope
  Fixed in 8 files across several FPU layers
  Also fixed in color_gamma and cs_funcs modules
- Reordered guard conditions to validate pipe type before accessing stream
- Ensures safe memory access patterns in DC DMUB service layer

All changes maintain backward compatibility and preserve functional behavior.

Reviewed-by: Dillon Varone 
Signed-off-by: Gaghik Khachatrian 
Signed-off-by: James Lin 
Tested-by: Daniel Wheeler 
Signed-off-by: Alex Deucher