kernel.git/drivers/gpu/drm/ast/ast_dp.c, branch linux-rolling-stable

drm/ast: Use msleep instead of mdelay for edid read

2025-10-02T11:48:37Z

commit c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 upstream. The busy-waiting in `mdelay()` can cause CPU stalls and kernel timeouts during boot. Signed-off-by: Nirmoy Das Reviewed-by: Thomas Zimmermann Tested-by: Carol L Soto csoto@nvidia.com Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory Display-Port") Cc: KuoHsiang Chou Cc: Thomas Zimmermann Cc: Dave Airlie Cc: Jocelyn Falempe Cc: dri-devel@lists.freedesktop.org Cc: # v5.19+ Signed-off-by: Thomas Zimmermann Link: https://lore.kernel.org/r/20250917194346.2905522-1-nirmoyd@nvidia.com Signed-off-by: Greg Kroah-Hartman

Merge tag 'drm-misc-next-2025-02-12' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

2025-02-14T00:24:02Z

drm-misc-next for v6.15: UAPI Changes: fourcc: - Add modifiers for MediaTek tiled formats Cross-subsystem Changes: bus: - mhi: Enable image transfer via BHIe in PBL dma-buf: - Add fast-path for single-fence merging Core Changes: atomic helper: - Allow full modeset on connector changes - Clarify semantics of allow_modeset - Clarify semantics of drm_atomic_helper_check() buddy allocator: - Fix multi-root cleanup ci: - Update IGT display: - dp: Support Extendeds Wake Timeout - dp_mst: Fix RAD-to-string conversion panic: - Encode QR code according to Fido 2.2 probe helper: - Cleanups scheduler: - Cleanups ttm: - Refactor pool-allocation code - Cleanups Driver Changes: amdxdma: - Fix error handling - Cleanups ast: - Refactor detection of transmitter chips - Refactor support of VBIOS display-mode handling - astdp: Fix connection status; Filter unsupported display modes bridge: - adv7511: Report correct capabilities - it6505: Fix HDCP V compare - sn65dsi86: Fix device IDs - Cleanups i915: - Enable Extendeds Wake Timeout imagination: - Check job dependencies with DRM-sched helper ivpu: - Improve command-queue handling - Use workqueue for IRQ handling - Add suport for HW fault injection - Locking fixes - Cleanups mgag200: - Add support for G200eH5 chips msm: - dpu: Add concurrent writeback support for DPU 10.x+ nouveau: - Move drm_slave_encoder interface into driver - nvkm: Refactor GSP RPC omapdrm: - Cleanups panel: - Convert several panels to multi-style functions to improve error handling - edp: Add support for B140UAN04.4, BOE NV140FHM-NZ, CSW MNB601LS1-3, LG LP079QX1-SP0V, MNE007QS3-7, STA 116QHD024002, Starry 116KHD024006, Lenovo T14s Gen6 Snapdragon - himax-hx83102: Add support for CSOT PNA957QT1-1, Kingdisplay kd110n11-51ie, Starry 2082109qfh040022-50e panthor: - Expose sizes of intenral BOs via fdinfo - Fix race between reset and suspend - Cleanups qaic: - Add support for AIC200 - Cleanups renesas: - Fix limits in DT bindings rockchip: - rk3576: Add HDMI support - vop2: Add new display modes on RK3588 HDMI0 up to 4K - Don't change HDMI reference clock rate - Fix DT bindings solomon: - Set SPI device table to silence warnings - Fix pixel and scanline encoding v3d: - Cleanups vc4: - Use drm_exec - Use dma-resv for wait-BO ioctl - Remove seqno infrastructure virtgpu: - Support partial mappings of GEM objects - Reserve VGA resources during initialization - Fix UAF in virtgpu_dma_buf_free_obj() - Add panic support vkms: - Switch to a managed modesetting pipeline - Add support for ARGB8888 xlnx: - Set correct DMA segment size - Fix error handling - Fix docs Signed-off-by: Dave Airlie From: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20250212090625.GA24865@linux.fritz.box

drm/ast: astdp: Validate display modes

2025-02-11T07:29:54Z

Validate each display mode against the astdp transmitter chips. Filters out modes that the chip does not support. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://patchwork.freedesktop.org/patch/msgid/20250204133209.403327-5-tzimmermann@suse.de

drm/ast: astdp: Store mode index in connector state

2025-02-11T07:29:26Z

Look up the mode index for the astdp transmitter ship in the encoder's atomic check and report an error if the display mode is not supported. The lookup uses the DRM display mode instead of the driver's internal VBIOS mode. Both are equivalent. The modesetting code later reads the calculated index from the connector state to avoid recalculating it. v2: - fix typo in commit message (Jocelyn) Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://patchwork.freedesktop.org/patch/msgid/20250204133209.403327-4-tzimmermann@suse.de

drm/ast: astdp: Inline mode-index calculation

2025-02-11T07:28:30Z

Programming the astdp transmitter chip requires a magic value for individual modes. Inline the helper for calculating the value into its only caller (i.e., the encoder's atomic_mode_set). With further refactoring, the atomic check will be able to detect invalid modes before attempting to program them. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://patchwork.freedesktop.org/patch/msgid/20250204133209.403327-3-tzimmermann@suse.de

drm/ast: astdp: Add connector state

2025-02-11T07:28:30Z

Add dedicated connector state for ASTDP connectors. The state will store values for programming the transmitter chip. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://patchwork.freedesktop.org/patch/msgid/20250204133209.403327-2-tzimmermann@suse.de

drm/ast: Remove struct ast_vbios_mode_info

2025-02-03T13:01:15Z

The type struct ast_vbios_mode_info used to store information about the color format and display mode. It has outlived its purpose. Inline its fields into struct ast_crtc_state and replace all instances. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://patchwork.freedesktop.org/patch/msgid/20250131092257.115596-16-tzimmermann@suse.de

drm/ast: astdp: Look up mode index from table

2025-02-03T13:01:15Z

Replace the large switch statement with a look-up table when selecting the mode index. Makes the code easier to read. The table is sorted by resolutions; if run-time overhead from traversal becomes significant, binary search would be a possible optimization. The mode index requires a refresh-rate index to be added or subtracted, which still requires a minimal switch. In the original code, some of the indices did not contain this computation. Those cases would have been equivalent to adding 0, so they are now all subsumed in the switch's default branch. Signed-off-by: Thomas Zimmermann Suggested-by: Jocelyn Falempe Reviewed-by: Jocelyn Falempe v3: - explain the semantics of the new switch statement (Jocelyn) Link: https://patchwork.freedesktop.org/patch/msgid/20250131092257.115596-15-tzimmermann@suse.de

drm/ast: astdp: Rework display-mode setting

2025-02-03T13:01:14Z

ASTDP requires a mode index, depending on the resolution. Move the look-up code from ast_dp_set_mode() into a separate helper. Inline the rest of the function into its only caller. Rename the variable names and register constants to match the programming manual. As before, the mode-index lookup still happens during the update's atomic commit. Right now, there's no way of doing it during the atomic check. The lookup requires the VBIOS mode, which is not available at the atomic check's invocation. At least warn now if the mode index could not be found. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://patchwork.freedesktop.org/patch/msgid/20250131092257.115596-14-tzimmermann@suse.de

drm/ast: Add helpers for VBIOS mode lookup

2025-02-03T13:01:12Z

Mode lines are independent from hardware Gen or TX chip, so hide all VBIOS mode tables in ast_vbios.c. Move the look-up code for VBIOS modes from ast_vbios_get_mode_info() to ast_vbios_find_mode(). The new look-up function respects the supported-mode flags in struct ast_device. For example, if a device does not have struct ast_device.support_fullhd set, the helper does not return a valid mode for 1920x1080. Taking the supported-mode flags into account allows for making the VBIOS tables the single reference for validating and setting display modes against hardware capabilities. v2: - replace mode switch with look-up table (Jocelyn) Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://patchwork.freedesktop.org/patch/msgid/20250131092257.115596-11-tzimmermann@suse.de