linux-stable.git/drivers/gpu/drm/sysfb/simpledrm.c, branch v7.2.5

drm/sysfb: simpledrm: Improve stride validation

2026-09-11T09:51:23+00:00

commit df6533f11688aa30be3bb883c7637f4ffdbb7cbd upstream.

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
Signed-off-by: Greg Kroah-Hartman

drm/sysfb: simpledrm: Improve panel-size validation

2026-09-11T09:51:23+00:00

commit 3a75a0761914d01c7362adf1f906cc1d1762c189 upstream.

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
Signed-off-by: Greg Kroah-Hartman

drm/sysfb: simpledrm: Improve framebuffer-size validation

2026-09-11T09:51:23+00:00

commit 03f1a3545b721fa7fdadd00080e237519a286a97 upstream.

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
Signed-off-by: Greg Kroah-Hartman

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

drm/sysfb: Share helpers for integer validation

2025-04-14T08:16:13+00:00

Provide sysfb helpers for validating framebuffer integer values
against limits. Update drivers. If a driver did not specify a limit
for a certain value, use INT_MAX.

v2:
- declare module information near EOF (Javier)

Signed-off-by: Thomas Zimmermann 
Reviewed-by: Javier Martinez Canillas 
Link: https://lore.kernel.org/r/20250410083834.10810-3-tzimmermann@suse.de

drm/sysfb: simpledrm: Remove unused helper simpledrm_device_of_dev()

2025-04-08T07:11:41+00:00

After moving most of the mode-setting pipeline into drm_sysfb_helper.c,
simpledrm_device_of_dev() is no longer being used. Remove it.

Signed-off-by: Thomas Zimmermann 
Reported-by: Jocelyn Falempe 
Closes: https://lore.kernel.org/dri-devel/20250407131344.139878-1-jfalempe@redhat.com/
Fixes: 177dfbdb7e67 ("drm/sysfb: Merge primary-plane functions")
Reviewed-by: Javier Martinez Canillas 
Reviewed-by: Jocelyn Falempe 
Link: https://lore.kernel.org/r/20250407134753.985925-3-tzimmermann@suse.de