kernel/linux.git/drivers/gpu/drm/mediatek/mtk_dp.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/mediatek: Move DP training to hotplug thread

2025-12-30T16:10:30+00:00

By adjusting the order of link training and relocating it to HPD, link training can identify the usability of each lane in the current link. It also supports handling signal instability and weakness due to environmental issues, enabling the acquisition of a stable bandwidth for the current link. Subsequently, DP work can proceed based on the actual maximum bandwidth. It should training in the hpd event thread. Check the mode with lane count and link rate of training. If we're eDP and capabilities were already parsed we can skip reading again because eDP panels aren't hotpluggable hence the caps and training information won't ever change in a boot life Therefore, bridge typec judgment is required for edp training in atomic_enable function. `mtk_dp_parse_capabilities` is related to DP training, it is used in `mtk_dp_hpd_event_thread` before DP training, and then only used by eDP when read edid. -Modify part of in `mtk_dp_bridge_atomic_disable` if (mtk_dp->train_info.cable_plugged_in) { drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3); usleep_range(2000, 3000); } /* power off aux */ mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE, DP_PWR_STATE_BANDGAP_TPLL, DP_PWR_STATE_MASK); -Modify part of in `mtk_dp_aux_panel_poweron(mtk_dp, false);` if (pwron) { .... } else { /* power off panel */ drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3); usleep_range(2000, 3000); /* power off aux */ mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE, DP_PWR_STATE_BANDGAP_TPLL, DP_PWR_STATE_MASK); } The `mtk_dp_aux_panel_poweron` function fails to align. Within the `mtk_dp_hpd_event_thread`, if DP is disconnected, the `mtk_dp_aux_panel_poweron` function will write from `aux` to `DPRX`, causing a failure and thus preventing symmetry. This shows the current timings after the DP cable is plugged in, as well as the modified timings. current timings: Fix timings: mtk_dp_hpd_event_thread() mtk_dp_hpd_event_thread() (including DP link training) | | ... ... mtk_dp_bridge_mode_valid() mtk_dp_bridge_mode_valid() | ... ... mtk_dp_bridge_atomic_check() mtk_dp_bridge_atomic_check() | ... ... mtk_dp_bridge_atomic_enable() mtk_dp_bridge_atomic_enable() (including DP link training) PS: 1. "..." represents ommited steps; 2. `mtk_dp_bridge_mode_valid()` calculates the bandwidth using the current lane count and link rate, and then filters each mode to determine if it supports returning a status. 3. In the `drm_display_mode_to_videomode(&crtc_state->adjusted_mode, &mtk_dp->info.vm);` function, within the `mtk_dp_bridge_atomic_check()` function, `adjusted_mode` sets the currently selected display mode for the DRM. 4. DP link training tests the signal conditions of the link between DPTX and DPRX, and selects the lane count and link rate that meet the signal conditions. 5. For example, the platform support DP 4lane 5.4G, but panel A support DP 2lane 5.4G. This is a time sequence: a).Plug in panel A. According to the platform, it can output 4K60Hz. b).Timing mode set 4K 60Hz(Including in mtk_dp_bridge_atomic_check function). c).Atomic enable(Based on panel A ability, training pass 2lane 5.4G). d).Finally, due to 2lane 5.4G bandwidth limitation, the platform cannot output 4K 60Hz, resulting in a black sreen. If apply this patch. a).Plug in panel A. b).Training pass 2lane 5.4G c).Timing mode set 2K 60Hz(Based on the 2lane 5.4G bandwidth limit and including in mtk_dp_bridge_atomic_che Signed-off-by: Liankun Yang Link: https://patchwork.kernel.org/project/dri-devel/patch/20251223061755.7717-1-liankun.yang@mediatek.com/ Signed-off-by: Chun-Kuang Hu

drm/mediatek: Fix device node reference leak in mtk_dp_dt_parse()

2025-11-19T23:01:28+00:00

The function mtk_dp_dt_parse() calls of_graph_get_endpoint_by_regs() to get the endpoint device node, but fails to call of_node_put() to release the reference when the function returns. This results in a device node reference leak. Fix this by adding the missing of_node_put() call before returning from the function. Found via static analysis and code review. Fixes: f70ac097a2cf ("drm/mediatek: Add MT8195 Embedded DisplayPort driver") Cc: stable@vger.kernel.org Signed-off-by: Miaoqian Lin Reviewed-by: Markus Schneider-Pargmann Reviewed-by: CK Hu Link: https://patchwork.kernel.org/project/dri-devel/patch/20251029072307.10955-1-linmq006@gmail.com/ Signed-off-by: Chun-Kuang Hu

drm/bridge: Pass down connector to drm bridge detect hook

2025-07-14T15:23:18+00:00

In some application scenarios, we hope to get the corresponding connector when the bridge's detect hook is invoked. In most cases, we can get the connector by drm_atomic_get_connector_for_encoder if the encoder attached to the bridge is enabled, however there will still be some scenarios where the detect hook of the bridge is called but the corresponding encoder has not been enabled yet. For instance, this occurs when the device is hot plug in for the first time. Since the call to bridge's detect is initiated by the connector, passing down the corresponding connector directly will make things simpler. Signed-off-by: Andy Yan Reviewed-by: Dmitry Baryshkov Link: https://lore.kernel.org/r/20250703125027.311109-3-andyshrk@163.com [DB: added the chunk to the cdn-dp driver] Signed-off-by: Dmitry Baryshkov

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

2025-06-11T07:01:34+00:00

Backmerging to forward to v6.16-rc1 Signed-off-by: Thomas Zimmermann

treewide, timers: Rename from_timer() to timer_container_of()

2025-06-08T07:07:37+00:00

Move this API to the canonical timer_*() namespace. [ tglx: Redone against pre rc1 ] Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/aB2X0jCKQO56WdMt@gmail.com

drm: convert many bridge drivers from devm_kzalloc() to devm_drm_bridge_alloc() API

2025-05-23T13:03:47+00:00

devm_drm_bridge_alloc() is the new API to be used for allocating (and partially initializing) a private driver struct embedding a struct drm_bridge. For many drivers having a simple code flow in the probe function, this commit does a mass conversion automatically with the following semantic patch. The changes have been reviewed manually for correctness as well as to find any false positives. The patch has been applied with the explicit exclusion of bridge/panel.c, handled by a separate patch. After applying the semantic patch, manually fixed these issues: - 4 drivers need ERR_CAST() instead of PTR_ERR() as the function calling devm_drm_bridge_alloc() returns a pointer - re-added empty lines and comments that the script had removed but that should stay @@ type T; identifier C; identifier BR; expression DEV; expression FUNCS; @@ -T *C; +T *C; ... ( -C = devm_kzalloc(DEV, ...); -if (!C) - return -ENOMEM; +C = devm_drm_bridge_alloc(DEV, T, BR, FUNCS); +if (IS_ERR(C)) + return PTR_ERR(C); | -C = devm_kzalloc(DEV, ...); -if (!C) - return ERR_PTR(-ENOMEM); +C = devm_drm_bridge_alloc(DEV, T, BR, FUNCS); +if (IS_ERR(C)) + return PTR_ERR(C); ) ... -C->BR.funcs = FUNCS; Reviewed-by: Manikandan Muralidharan # microchip-lvds.c Reviewed-by: Douglas Anderson # parade-ps8640 Tested-by: Douglas Anderson # parade-ps8640 Acked-by: Maxime Ripard Link: https://lore.kernel.org/r/20250509-drm-bridge-convert-to-alloc-api-v3-2-b8bc1f16d7aa@bootlin.com [Luca: fixed trivial patch conflict in adv7511_drv.c while applying] Signed-off-by: Luca Ceresoli

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

2025-04-07T12:35:48+00:00

Backmerging to get v6.15-rc1 into drm-misc-next. Also fixes a build issue when enabling CONFIG_DRM_SCHED_KUNIT_TEST. Signed-off-by: Thomas Zimmermann

treewide: Switch/rename to timer_delete[_sync]()

2025-04-05T08:30:12+00:00

timer_delete[_sync]() replaces del_timer[_sync](). Convert the whole tree over and remove the historical wrapper inlines. Conversion was done with coccinelle plus manual fixups where necessary. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar