kernel/linux.git/drivers/gpu/drm/msm/dp/dp_ctrl.c, branch linux-7.0.y

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

drm/msm/dp: Avoid division by zero in msm_dp_ctrl_config_msa()

2026-01-21T00:12:34+00:00

An (admittedly problematic) optimization change in LLVM 20 [1] turns known division by zero into the equivalent of __builtin_unreachable(), which invokes undefined behavior if it is encountered in a control flow graph, destroying code generation. When compile testing for x86_64, objtool flags an instance of this optimization triggering in msm_dp_ctrl_config_msa(), inlined into msm_dp_ctrl_on_stream(): drivers/gpu/drm/msm/msm.o: warning: objtool: msm_dp_ctrl_on_stream(): unexpected end of section .text.msm_dp_ctrl_on_stream The zero division happens if the else branch in the first if statement in msm_dp_ctrl_config_msa() is taken because pixel_div is initialized to zero and it is not possible for LLVM to eliminate the else branch since rate is still not known after inlining into msm_dp_ctrl_on_stream(). Transform the if statements into a switch statement with a default case with the existing error print and an early return to avoid the invalid division. Add a comment to note this helps the compiler, even though the case is known to be unreachable. With this, pixel_dev's default zero initialization can be dropped, as it is dead with this change. Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Link: https://github.com/llvm/llvm-project/commit/37932643abab699e8bb1def08b7eb4eae7ff1448 [1] Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202601081959.9UVJEOfP-lkp@intel.com/ Suggested-by: Konrad Dybcio Signed-off-by: Nathan Chancellor Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/698355/ Link: https://lore.kernel.org/r/20260113-drm-msm-dp_ctrl-avoid-zero-div-v2-1-f1aa67bf6e8e@kernel.org Signed-off-by: Dmitry Baryshkov

drm/msm/dp: Enable support for eDP v1.4+ link rates table

2026-01-06T03:30:08+00:00

The MSM DRM driver currently does not support panels which report their supported link rates via the SUPPORTED_LINK_RATES table. For panels which do not offer the optional eDP v1.3 fallback via MAX_LINK_RATE, this will cause a panel probe failure (e.g. Samsung ATNA30DW01-1 as found in Microsoft Surface Pro 11). Detect eDP v1.4 panels and parse the SUPPORTED_LINK_RATES table when present. Additionally, set the rate using LINK_RATE_SET instead of LINK_BW_SET, but only if LINK_BW_SET hasn't already been written to. Signed-off-by: Dale Whinham Tested-by: Jérôme de Bretagne Tested-by: Steev Klimaszewski Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/695064/ Link: https://lore.kernel.org/r/20251218-drm-msm-edp14-v2-1-2e56c2338ab1@gmail.com Signed-off-by: Dmitry Baryshkov

drm/msm/dp: Add support for lane mapping configuration

2025-11-14T14:59:27+00:00

QCS615 platform requires non-default logical-to-physical lane mapping due to its unique hardware routing. Unlike the standard mapping sequence <0 1 2 3>, QCS615 uses <3 2 0 1>, which necessitates explicit configuration via the data-lanes property in the device tree. This ensures correct signal routing between the DP controller and PHY. For partial definitions, fill remaining lanes with unused physical lanes in ascending order. Signed-off-by: Xiangxu Yin Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/675645/ Link: https://lore.kernel.org/r/20250919-add-displayport-support-for-qcs615-platform-v5-14-eae6681f4002@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov

drm/msm/dp: drop the msm_dp_catalog module

2025-07-04T13:35:19+00:00

Now as the msm_dp_catalog module became nearly empty, drop it, accessing registers directly from the corresponding submodules. Reviewed-by: Stephen Boyd Tested-by: Stephen Boyd # sc7180-trogdor Signed-off-by: Dmitry Baryshkov Signed-off-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/654332/ Link: https://lore.kernel.org/r/20250518-fd-dp-audio-fixup-v6-11-2f0ec3ec000d@oss.qualcomm.com

drm/msm/dp: move interrupt handling to dp_ctrl

2025-07-04T13:35:19+00:00

It makes it easier to keep all interrupts-related code in dp_ctrl submodule. Move all functions to dp_ctrl.c. Reviewed-by: Stephen Boyd Tested-by: Stephen Boyd # sc7180-trogdor Signed-off-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/654330/ Link: https://lore.kernel.org/r/20250518-fd-dp-audio-fixup-v6-10-2f0ec3ec000d@oss.qualcomm.com

drm/msm/dp: move more AUX functions to dp_aux.c

2025-07-04T13:35:18+00:00

Move several misnamed functions accessing AUX bus to dp_aux.c, further cleaning up dp_catalog submodule. Reviewed-by: Stephen Boyd Tested-by: Stephen Boyd # sc7180-trogdor Signed-off-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/654333/ Link: https://lore.kernel.org/r/20250518-fd-dp-audio-fixup-v6-9-2f0ec3ec000d@oss.qualcomm.com

drm/msm/dp: move/inline ctrl register functions

2025-07-04T13:35:18+00:00

Move CTRL-related functions to dp_ctrl.c, inlining one line wrappers during this process. The enable/disable functions have been split to the enable/disable or enter/exit pairs. The IRQ and HPD related functions are left in dp_catalog.c, pending later cleanup. Reviewed-by: Stephen Boyd Tested-by: Stephen Boyd # sc7180-trogdor Signed-off-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/654328/ Link: https://lore.kernel.org/r/20250518-fd-dp-audio-fixup-v6-8-2f0ec3ec000d@oss.qualcomm.com

drm/msm/dp: move/inline panel related functions

2025-07-04T13:35:18+00:00

Move panel-related functions to dp_panel.c, following up the cleanup done by the rest of the submodules. Reviewed-by: Stephen Boyd Tested-by: Stephen Boyd # sc7180-trogdor Signed-off-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/654321/ Link: https://lore.kernel.org/r/20250518-fd-dp-audio-fixup-v6-6-2f0ec3ec000d@oss.qualcomm.com