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

drm/ast: Swap framebuffer writes on big-endian machines

2026-03-04T12:19:55Z

[ Upstream commit 50c26c301c5176cc8b431044390e10ec862b9b77 ] Swap the pixel data when writing to framebuffer memory on big-endian machines. Fixes incorrect output. Aspeed graphics does not appear to support big-endian framebuffers after AST2400, although the feature has been documented. There's a lengthy discussion at [1]. v5: - avoid restricted cast from __be16 (kernel test robot) Signed-off-by: René Rebe Link: https://lore.kernel.org/dri-devel/20251202.170626.2134482663677806825.rene@exactco.de/ # [1] Reviewed-by: Thomas Zimmermann Signed-off-by: Thomas Zimmermann Link: https://patch.msgid.link/20251212.210504.1355099120650239629.rene@exactco.de Signed-off-by: Sasha Levin

drm/ast: Handle framebuffer from dma-buf

2025-11-10T15:02:13Z

In the atomic update callback, ast should call drm_gem_fb_begin_cpu_access() to make sure it can read the framebuffer from the CPU, otherwise the data might not be there due to cache, and synchronization. Tested on a Lenovo SE100, while rendering on the ArrowLake GPU with i915 driver, and using ast for display. Suggested-by: Thomas Zimmermann Reviewed-by: Thomas Zimmermann Link: https://patch.msgid.link/20251030091627.340780-1-jfalempe@redhat.com Signed-off-by: Jocelyn Falempe

drm: include drm_print.h where needed

2025-10-31T08:34:52Z

There are a gazillion files that depend on drm_print.h being indirectly included via drm_buddy.h, drm_mm.h, or ttm/ttm_resource.h. In preparation for removing those includes, explicitly include drm_print.h where needed. Cc: Thomas Zimmermann Reviewed-by: Thomas Zimmermann Signed-off-by: Jani Nikula Link: https://lore.kernel.org/r/5fe67395907be33eb5199ea6d540e29fddee71c8.1761734313.git.jani.nikula@intel.com

Merge tag 'drm-misc-next-2025-10-21' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

2025-10-24T11:25:20Z

drm-misc-next for v6.19: UAPI Changes: amdxdna: - Support reading last hardware error Cross-subsystem Changes: dma-buf: - heaps: Create heap per CMA reserved location; Improve user-space documentation Core Changes: atomic: - Clean up and improve state-handling interfaces, update drivers bridge: - Improve ref counting buddy: - Optimize block management Driver Changes: amdxdna: - Fix runtime power management - Support firmware debug output ast: - Set quirks for each chip model atmel-hlcdc: - Set LCDC_ATTRE register in plane disable - Set correct values for plane scaler bochs: - Use vblank timer bridge: - synopsis: Support CEC; Init timer with correct frequency cirrus-qemu: - Use vblank timer imx: - Clean up ivu: - Update JSM API to 3.33.0 - Reset engine on more job errors - Return correct error codes for jobs komeda: - Use drm_ logging functions panel: - edp: Support AUO B116XAN02.0 panfrost: - Embed struct drm_driver in Panfrost device - Improve error handling - Clean up job handling panthor: - Support custom ASN_HASH for mt8196 renesas: - rz-du: Fix dependencies rockchip: - dsi: Add support for RK3368 - Fix LUT size for RK3386 sitronix: - Fix output position when clearing screens qaic: - Support dma-buf exports - Support new firmware's READ_DATA implementation - Replace kcalloc with memdup - Replace snprintf() with sysfs_emit() - Avoid overflows in arithmetics - Clean up - Fixes qxl: - Use vblank timer rockchip: - Clean up mode-setting code vgem: - Fix fence timer deadlock virtgpu: - Use vblank timer Signed-off-by: Simona Vetter From: Thomas Zimmermann Link: https://lore.kernel.org/r/20251021111837.GA40643@linux.fritz.box

Merge tag 'drm-misc-next-2025-10-02' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

2025-10-21T08:16:34Z

drm-misc-next for v6.19: UAPI Changes: Cross-subsystem Changes: - fbcon cleanups. - Make drivers depend on FB_TILEBLITTING instead of selecting it, and hide FB_MODE_HELPERS. Core Changes: - More preparations for rust. - Throttle dirty worker with vblank - Use drm_for_each_bridge_in_chain_scoped in drm's bridge code and assorted fixes. - Ensure drm_client_modeset tests are enabled in UML. - Rename ttm_bo_put to ttm_bo_fini, as a further step in removing the TTM bo refcount. - Add POST_LT_ADJ_REQ training sequence. - Show list of removed but still allocated bridges. - Add a simulated vblank interrupt for hardware without it, and add some helpers to use them in vkms and hypervdrm. Driver Changes: - Assorted small fixes, cleanups and updates to host1x, tegra, panthor, amdxdna, gud, vc4, ssd130x, ivpu, panfrost, panthor, sysfb, bridge/sn65dsi86, solomon, ast, tidss. - Convert drivers from using .round_rate() to .determine_rate() - Add support for KD116N3730A07/A12, chromebook mt8189, JT101TM023, LQ079L1SX01, raspberrypi 5" panels. - Improve reclocking on tegra186+ with nouveau. - Improve runtime pm in amdxdna. - Add support for HTX_PAI in imx. - Use a helper to calculate dumb buffer sizes in most drivers. Signed-off-by: Simona Vetter From: Maarten Lankhorst Link: https://lore.kernel.org/r/b412fb91-8545-466a-8102-d89c0f2758a7@linux.intel.com

drm/ast: Store HSync adjustment in device quirks

2025-10-15T07:59:47Z

Add the add4 flag to struct ast_device_quirks and set it on AST2600. Replaces a call to IS_AST_GEN7() in ast_set_crtc_reg(). Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe > Link: https://lore.kernel.org/r/20251007150343.273718-6-tzimmermann@suse.de

drm/ast: Store precatch settings in struct ast_device_quirks

2025-10-15T07:59:44Z

Add a precatch flag in struct ast_device_info and set it on AST2500 and AST2600. Remove calls to IS_AST_GENn() from ast_set_crtc_reg(). Also fix the coding style in several places. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://lore.kernel.org/r/20251007150343.273718-5-tzimmermann@suse.de

drm/ast: Store CRTC memory request threshold in device quirks

2025-10-15T07:59:43Z

Store each hardware's CRTC memory threshold in the specific instance of struct ast_device_quirks. Removes the calls to IS_AST_GENn() from ast_set_crtthd_reg(). The values stored in the registers appear to be plain limits. Hence write them in the driver in decimal format instead of hexadecimal. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://lore.kernel.org/r/20251007150343.273718-4-tzimmermann@suse.de

drm/ast: Store DRAM clock table in struct ast_device

2025-10-15T07:59:40Z

Init the new field dclk_table in struct ast_device to the per-gen table of DRAM clock parameters. Use the field during modesetting. The table is static, so a setup is only required once. Removes the call to IS_AST_GEN() from the atomic commit's code path. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://lore.kernel.org/r/20251007150343.273718-2-tzimmermann@suse.de

drm/ast: Blank with VGACR17 sync enable, always clear VGACRB6 sync off

2025-10-15T07:55:35Z

Blank the display by disabling sync pulses with VGACR17<7>. Unblank by reenabling them. This VGA setting should be supported by all Aspeed hardware. Ast currently blanks via sync-off bits in VGACRB6. Not all BMCs handle VGACRB6 correctly. After disabling sync during a reboot, some BMCs do not reenable it after the soft reset. The display output remains dark. When the display is off during boot, some BMCs set the sync-off bits in VGACRB6, so the display remains dark. Observed with Blackbird AST2500 BMCs. Clearing the sync-off bits unconditionally fixes these issues. Also do not modify VGASR1's SD bit for blanking, as it only disables GPU access to video memory. v2: - init vgacrb6 correctly (Jocelyn) Signed-off-by: Thomas Zimmermann Fixes: ce3d99c83495 ("drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers") Tested-by: Nick Bowler Reported-by: Nick Bowler Closes: https://lore.kernel.org/dri-devel/wpwd7rit6t4mnu6kdqbtsnk5bhftgslio6e2jgkz6kgw6cuvvr@xbfswsczfqsi/ Cc: Douglas Anderson Cc: Dave Airlie Cc: Thomas Zimmermann Cc: Jocelyn Falempe Cc: dri-devel@lists.freedesktop.org Cc: # v6.7+ Reviewed-by: Jocelyn Falempe Link: https://lore.kernel.org/r/20251014084743.18242-1-tzimmermann@suse.de