kernel/linux.git/include/drm/drm_format_helper.h, branch v6.19.11

drm/format-helper: Remove drm_fb_blit()

2025-09-23T13:06:06+00:00

The function is unused; remove it. Instead of relying on a general blit helper, drivers should pick a blit function by themselves from their list of supported color formats. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Link: https://lore.kernel.org/r/20250918154207.84714-4-tzimmermann@suse.de

drm/format-helper: introduce drm_fb_xrgb8888_to_gray2()

2025-09-01T13:35:07+00:00

Convert XRGB8888 to 2bit grayscale. It uses drm_fb_xrgb8888_to_gray8() to convert the pixels to gray8 as an intermediate step before converting to gray2. Signed-off-by: Marcus Folkesson Reviewed-by: Javier Martinez Canillas Acked-by: Thomas Zimmermann Link: https://lore.kernel.org/r/20250721-st7571-format-v2-5-159f4134098c@gmail.com Signed-off-by: Javier Martinez Canillas

drm/format-helper: Split off byte swapping from drm_fb_xrgb8888_to_rgb565()

2025-06-27T13:59:23+00:00

Move big-endian support from drm_fb_xrgb8888_to_rgb565() into the new helper drm_xrgb8888_to_rgb565be(). The functionality is required for displays with big-endian byte order. Update all callers. With the change applied, drm_fb_xrgb8888_to_rgb565() has the same signature as the other conversion functions, which is required for further updates to drm_fb_blit(). Also makes the format-conversion helper available to panic handlers, if necessary. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://lore.kernel.org/r/20250625114911.1121301-1-tzimmermann@suse.de

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/tests: Do not use drm_fb_blit() in format-helper tests

2025-06-18T08:46:02+00:00

Export additional helpers from the format-helper library and open-code drm_fb_blit() in tests. Prepares for the removal of drm_fb_blit(). Only sysfb drivers use drm_fb_blit(). The function will soon be removed from format helpers and be refactored within sysfb helpers. Signed-off-by: Thomas Zimmermann Reviewed-by: José Expósito Acked-by: Maxime Ripard Link: https://lore.kernel.org/r/20250616083846.221396-2-tzimmermann@suse.de

drm/format-helper: Add conversion from XRGB8888 to BGR888

2025-03-03T15:13:33+00:00

Add XRGB8888 emulation helper for devices that only support BGR888. Signed-off-by: Kerem Karabay Signed-off-by: Aditya Garg Reviewed-by: Thomas Zimmermann Signed-off-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/9A67EA95-9BC7-4D56-8F87-05EAC1C166AD@live.com

drm/ast: cursor: Move format conversion to shared helper

2025-02-20T07:38:33+00:00

User-space cursor-image data is encoded in ARBG8888, while hardware supports ARGB4444. Implement the format conversion as part of the format-helper framework, so that other drivers can benefit. This allows to respect the damage area of the cursor update. In previous code, all cursor image data had to be converted on each update. Now, only the changed areas require an update. The hardware image is always updated completely, as it is required for the checksum update. The format-conversion helper still contains the old implementation's optimization of writing 2 output pixels at the same time. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://patchwork.freedesktop.org/patch/msgid/20250217122336.230067-3-tzimmermann@suse.de

drm: fix drm_format_helper.h kernel-doc warnings

2024-03-07T15:17:25+00:00

As the documentation says, all the fields are considered private. Mark them private also for kernel-doc to silence warnings. Reviewed-by: Thomas Zimmermann Signed-off-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/6dc5b1df34abc10d416c2db5b390440cf56e21ce.1709749576.git.jani.nikula@intel.com

drm/format-helper: Pass format-conversion state to helpers

2023-11-14T09:16:53+00:00

Pass an instance of struct drm_format_conv_state to DRM's format conversion helpers. Update all callers. Most drivers can use the format-conversion state from their shadow- plane state. The shadow plane's destroy function releases the allocated buffer. Drivers will later be able to allocate a buffer of appropriate size in their plane's atomic_check code. The gud driver uses a separate thread for committing updates. For now, the update worker contains its own format-conversion state. Images in the format-helper tests are small. The tests preallocate a static page for the temporary buffer. Unloading the module releases the memory. v6: * update patch for ssd132x support v5: * avoid using unusupported shadow-plane state in repaper (Noralf) * fix documentation (Noralf, kernel test robot) v3: * store buffer in shadow-plane state (Javier, Maxime) * replace ARRAY_SIZE() with sizeof() (Jani) Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Tested-by: Javier Martinez Canillas # ssd130x Cc: Noralf Trønnes Cc: Javier Martinez Canillas Cc: Gerd Hoffmann Cc: David Lechner Link: https://patchwork.freedesktop.org/patch/msgid/20231009141018.11291-4-tzimmermann@suse.de

drm/format-helper: Cache buffers with struct drm_format_conv_state

2023-11-14T09:01:12+00:00

Hold temporary memory for format conversion in an instance of struct drm_format_conv_state. Update internal helpers of DRM's format-conversion code accordingly. Drivers will later be able to maintain this cache by themselves. Besides caching, struct drm_format_conv_state will be useful to hold additional information for format conversion, such as palette data or foreground/background colors. This will enable conversion from indexed color formats to component-based formats. v5: * improve documentation (Javier, Noralf) v3: * rename struct drm_xfrm_buf to struct drm_format_conv_state (Javier) * remove managed cleanup * add drm_format_conv_state_copy() for shadow-plane support Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Acked-by: Noralf Trønnes Tested-by: Javier Martinez Canillas Link: https://patchwork.freedesktop.org/patch/msgid/20231009141018.11291-2-tzimmermann@suse.de