linux-next.git/drivers/gpu/drm/sysfb/simpledrm.c, branch master

drm/sysfb: simpledrm: Validate mmap size against framebuffer size

2026-06-30T09:14:21+00:00

The size of the mmap'ed framebuffer could be smaller than the minimum required framebuffer size. Validate the resource size against the framebuffer size. Buggy firmware that triggers this check should be fixed up with a quirk on a case-by-case base. v3: - fix size checks (Sashiko) - improve error message for alignment check (Thierry) - do not store aligned size value Signed-off-by: Thomas Zimmermann Suggested-by: Sashiko Reviewed-by: Thierry Reding Reviewed-by: Maxime Ripard Reviewed-by: Javier Martinez Canillas Link: https://patch.msgid.link/20260625094509.157581-6-tzimmermann@suse.de

drm/sysfb: simpledrm: Improve stride validation

2026-06-30T09:14:17+00:00

Validate the computed stride against the maximum value INT_MAX. Signed-off-by: Thomas Zimmermann Reviewed-by: Thierry Reding Reviewed-by: Maxime Ripard Reviewed-by: Javier Martinez Canillas Fixes: 7bfa5c7b28d6 ("drm/simpledrm: Compute linestride with drm_format_info_min_pitch()") Cc: # v6.1+ Link: https://patch.msgid.link/20260625094509.157581-5-tzimmermann@suse.de

drm/sysfb: simpledrm: Inline simplefb_get_validated_int()

2026-06-30T09:14:14+00:00

The helper simplefb_get_validated_int() is only a wrapper around drm_sysfb_get_validated_int(). Inline the function into its callers. Signed-off-by: Thomas Zimmermann Reviewed-by: Thierry Reding Reviewed-by: Maxime Ripard Reviewed-by: Javier Martinez Canillas Link: https://patch.msgid.link/20260625094509.157581-4-tzimmermann@suse.de

drm/sysfb: simpledrm: Improve panel-size validation

2026-06-30T09:14:10+00:00

Validate the panel size from the device-tree node against the limitations of struct drm_display_mode. The type only stores sizes in 16-bit fields. Fail transparently on errors; do not warn. v3: - move comments to a more prominent place (Thierry) v2: - only use initialized values in debugging output (Sashiko) Signed-off-by: Thomas Zimmermann Reviewed-by: Thierry Reding Reviewed-by: Maxime Ripard Reviewed-by: Javier Martinez Canillas Fixes: 2a6d731a8f16 ("drm/simpledrm: Allow physical width and height configuration via panel node") Cc: Rayyan Ansari Cc: # v6.4+ Link: https://patch.msgid.link/20260625094509.157581-3-tzimmermann@suse.de

drm/sysfb: simpledrm: Improve framebuffer-size validation

2026-06-30T09:13:41+00:00

Validate the framebuffer size from the firmware against the limitations of struct drm_display_mode. The type only stores sizes in 16-bit fields. Fail probing on errors. v2: - remove unused function simplefb_get_validated_int0() (Sashiko) Signed-off-by: Thomas Zimmermann Reviewed-by: Thierry Reding Reviewed-by: Maxime Ripard Reviewed-by: Javier Martinez Canillas Fixes: 11e8f5fd223b ("drm: Add simpledrm driver") Cc: # v5.14+ Fixes: 11e8f5fd223b ("drm: Add simpledrm driver") Link: https://patch.msgid.link/20260625094509.157581-2-tzimmermann@suse.de

drm/sysfb: simpledrm: Support power management

2026-05-04T12:31:00+00:00

Set PM ops for the simpledrm driver. Suspend and resume the DRM state on systems that support it. Many systems lose the hardware's framebuffer settings on suspend, hence resuming doesn't work there. Yet some systems, most notably emulators, keep the hardware state across suspend/resume cycles. There, DRM's suspend and resume helpers bring back the display on resume. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Link: https://patch.msgid.link/20260408120722.328769-5-tzimmermann@suse.de

drm: include drm_print.h where needed

2025-10-31T08:34:52+00:00

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

drm/sysfb: simpledrm: Sort headers correctly

2025-09-23T13:59:01+00:00

Make sure the headers are sorted alphabetically to ensure consistent code. Signed-off-by: Luca Weiss Reviewed-by: Javier Martinez Canillas Reviewed-by: Thomas Zimmermann Signed-off-by: Thomas Zimmermann

drm/simpledrm: Use of_reserved_mem_region_to_resource() for "memory-region"

2025-08-13T22:12:45+00:00

Use the newly added of_reserved_mem_region_to_resource() function to handle "memory-region" properties. Reviewed-by: Javier Martinez Canillas Acked-by: Thomas Zimmermann Link: https://lore.kernel.org/r/20250703183447.2073902-1-robh@kernel.org Signed-off-by: Rob Herring (Arm)

drm/format-helper: Move drm_fb_build_fourcc_list() to sysfb helpers

2025-06-18T08:46:03+00:00

Only sysfb drivers use drm_fb_build_fourcc_list(). Move the function to sysfb helpers and rename it accordingly. Update drivers and tests. v3: - update naming in tests v2: - select DRM_SYSFB_HELPER (kernel test robot) Signed-off-by: Thomas Zimmermann Reviewed-by: José Expósito Acked-by: Maxime Ripard Acked-by: Javier Martinez Canillas Link: https://lore.kernel.org/r/20250616083846.221396-4-tzimmermann@suse.de