Ville Syrjälä c6fbb6bca1 drm: Fix color LUT rounding ... The current implementation of drm_color_lut_extract() generates weird results. Eg. if we go through all the values for 16->8bpc conversion we see the following pattern: in out (count) 0 - 7f -> 0 (128) 80 - 17f -> 1 (256) 180 - 27f -> 2 (256) 280 - 37f -> 3 (256) ... fb80 - fc7f -> fc (256) fc80 - fd7f -> fd (256) fd80 - fe7f -> fe (256) fe80 - ffff -> ff (384) So less values map to 0 and more values map 0xff, which doesn't seem particularly great. To get just the same number of input values to map to the same output values we'd just need to drop the rounding entrirely. But perhaps a better idea would be to follow the OpenGL int<->float conversion rules, in which case we get the following results: in out (count) 0 - 80 -> 0 (129) 81 - 181 -> 1 (257) 182 - 282 -> 2 (257) 283 - 383 -> 3 (257) ... fc7c - fd7c -> fc (257) fd7d - fe7d -> fd (257) fe7e - ff7e -> fe (257) ff7f - ffff -> ff (129) Note that since the divisor is constant the compiler is able to optimize away the integer division in most cases. The only exception is the _ULL() case on 32bit architectures since that gets emitted as inline asm via do_div() and thus the compiler doesn't get to optimize it. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231013131402.24072-2-ville.syrjala@linux.intel.com Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Acked-by: Maxime Ripard <mripard@kernel.org>		2023-11-23 15:11:47 +02:00
..
bridge	drm: bridge: samsung-dsim: Fix waiting for empty cmd transfer FIFO on older Exynos	2023-08-11 14:54:05 +02:00
display	drm/dp_mst: Fix PBN divider calculation for UHBR rates	2023-11-21 16:32:44 +02:00
i2c	…
ttm	drm/ttm: Remove two unused function declarations	2023-08-10 09:12:08 +02:00
amd_asic_type.h	…
drm_accel.h	drm/debugfs: rework debugfs directory creation v5	2023-09-01 08:51:18 +02:00
drm_aperture.h	drm/aperture: Remove primary argument	2023-04-16 14:17:41 +02:00
drm_atomic.h	drm/bridge: Fix kernel-doc typo in desc of output_bus_cfg in drm_bridge_state	2023-08-21 10:01:04 +02:00
drm_atomic_helper.h	drm/atomic-helper: Add atomic_enable plane-helper callback	2023-02-20 15:19:23 +01:00
drm_atomic_state_helper.h	drm/atomic-helper: Add an analog TV atomic_check implementation	2022-11-24 12:42:40 +01:00
drm_atomic_uapi.h	drm: handle kernel fences in drm_gem_plane_helper_prepare_fb v2	2022-05-02 09:01:51 +02:00
drm_audio_component.h	drm/audio: make drm_audio_component.h self-contained	2022-11-29 14:14:51 +02:00
drm_auth.h	…
drm_blend.h	…
drm_bridge.h	drm/bridge: Drop conditionals around of_node pointers	2023-09-06 08:32:37 -07:00
drm_bridge_connector.h	drm/bridge_connector: drop drm_bridge_connector_en/disable_hpd()	2023-01-05 15:08:10 +01:00
drm_buddy.h	drm/buddy: Improve contiguous memory allocation	2023-09-11 20:18:00 +02:00
drm_cache.h	LoongArch: Add writecombine support for drm	2022-06-03 20:09:27 +08:00
drm_client.h	drm/debugfs: rework debugfs directory creation v5	2023-09-01 08:51:18 +02:00
drm_color_mgmt.h	drm: Fix color LUT rounding	2023-11-23 15:11:47 +02:00
drm_connector.h	Merge drm/drm-next into drm-intel-next	2023-10-04 18:06:27 +03:00
drm_crtc.h	drm: Remove references to removed transitional helpers	2023-07-29 21:25:16 +02:00
drm_crtc_helper.h	drm/crtc-helper: Remove most include statements from drm_crtc_helper.h	2023-01-18 09:25:32 +01:00
drm_damage_helper.h	…
drm_debugfs.h	drm/gpuvm: rename struct drm_gpuva_manager to struct drm_gpuvm	2023-09-26 01:51:28 +02:00
drm_debugfs_crc.h	…
drm_device.h	drm/debugfs: remove dev->debugfs_list and debugfs_mutex v2	2023-09-01 08:53:05 +02:00
drm_displayid.h	drm/displayid: provide access to DisplayID version and primary use case	2023-02-27 02:58:38 +03:00
drm_drv.h	drm/debugfs: Add inline to drm_debugfs_dev_init() to suppres -Wunused-function	2023-09-08 17:23:31 -03:00
drm_edid.h	Merge drm/drm-next into drm-intel-next	2023-09-15 11:23:38 +03:00
drm_encoder.h	drm/encoder: Introduce drmm_encoder_init	2022-07-13 10:46:05 +02:00
drm_encoder_slave.h	drm: Remove linux/i2c.h from drm_crtc.h	2022-07-05 21:15:23 +03:00
drm_exec.h	drm/drm_exec: Work around a WW mutex lockdep oddity	2023-09-07 10:30:12 +02:00
drm_fb_dma_helper.h	drm/gem: rename GEM CMA helpers to GEM DMA helpers	2022-08-03 18:31:49 +02:00
drm_fb_helper.h	drm/fb-helper: Remove unused inline function drm_fb_helper_defio_init()	2023-07-25 20:38:37 +02:00
drm_fbdev_dma.h	drm/fbdev-dma: Implement fbdev emulation for GEM DMA helpers	2023-03-14 17:07:47 +01:00
drm_fbdev_generic.h	drm/fb-helper: Move generic fbdev emulation into separate source file	2022-11-05 17:12:04 +01:00
drm_file.h	drm: Update file owner during use	2023-09-20 15:27:44 +02:00
drm_fixed.h	drm: Add fixed-point helper to get rounded integer values	2023-05-15 10:58:10 -03:00
drm_flip_work.h	…
drm_format_helper.h	drm/format-helper: Simplify drm_fb_build_fourcc_list()	2023-01-03 14:27:39 +01:00
drm_fourcc.h	drm/fourcc: Add drm_format_info.is_color_indexed flag	2022-07-09 15:00:08 +02:00
drm_framebuffer.h	drm/fb: Improve drm_framebuffer.offsets documentation	2022-07-09 15:58:52 +02:00
drm_gem.h	drm/gem: fix lockdep check for dma-resv lock	2023-08-04 20:34:31 +02:00
drm_gem_atomic_helper.h	drm/simple-kms: Remove drm_gem_simple_display_pipe_prepare_fb()	2022-12-05 13:35:37 +01:00
drm_gem_dma_helper.h	drm: Clear fd/handle callbacks in struct drm_driver	2023-06-26 11:08:41 +02:00
drm_gem_framebuffer_helper.h	drm/gem: Ignore color planes that are unused by framebuffer format	2022-05-19 19:25:02 +02:00
drm_gem_shmem_helper.h	drm: Clear fd/handle callbacks in struct drm_driver	2023-06-26 11:08:41 +02:00
drm_gem_ttm_helper.h	drm/ttm: merge ttm_bo_api.h and ttm_bo_driver.h v2	2022-12-06 12:54:14 +01:00
drm_gem_vram_helper.h	drm: Clear fd/handle callbacks in struct drm_driver	2023-06-26 11:08:41 +02:00
drm_gpuvm.h	drm/gpuvm: rename struct drm_gpuva_manager to struct drm_gpuvm	2023-09-26 01:51:28 +02:00
drm_ioctl.h	…
drm_kunit_helpers.h	drm/tests: helpers: Avoid a driver uaf	2023-09-14 13:57:58 +02:00
drm_lease.h	…
drm_legacy.h	drm: Declare hashtable as legacy	2021-11-30 09:41:28 +01:00
drm_managed.h	drm: fix drmm_mutex_init()	2023-05-22 12:23:50 +02:00
drm_mipi_dbi.h	drm/mipi-dbi: Support separate I/O regulator	2022-12-14 14:57:09 +01:00
drm_mipi_dsi.h	Driver core changes for 6.3-rc1	2023-02-24 12:58:55 -08:00
drm_mm.h	drm: Replace kernel.h with the necessary inclusions	2021-12-09 13:46:13 +01:00
drm_mode_config.h	drm/fbdev-generic: Remove unused prefer_shadow_fbdev flag	2023-03-22 13:32:47 +01:00
drm_mode_object.h	drm/object: Add drm_object_property_get_default_value() function	2022-02-25 17:55:42 +01:00
drm_modes.h	drm/modes: Add a function to generate analog display modes	2022-11-24 12:42:39 +01:00
drm_modeset_helper.h	…
drm_modeset_helper_vtables.h	drm: Remove references to removed transitional helpers	2023-07-29 21:25:16 +02:00
drm_modeset_lock.h	drm/locking: fix drm_modeset_acquire_ctx kernel-doc	2022-01-20 14:41:25 +02:00
drm_module.h	drm: Provide platform module-init macro	2022-01-19 18:40:18 +01:00
drm_of.h	drm: of: Add drm_of_get_dsi_bus helper function	2023-01-27 09:39:21 +01:00
drm_panel.h	drm/panel: Fix kernel-doc typo for `follower_lock`	2023-08-03 10:21:27 +02:00
drm_pciids.h	drm: Remove some obsolete drm pciids(tdfx, mga, i810, savage, r128, sis, via)	2023-01-13 09:44:56 +01:00
drm_plane.h	drm/drm_plane.h: fix grammar of the comment	2023-08-03 11:06:03 +02:00
drm_plane_helper.h	drm/plane-helper: Add the missing declaration of drm_atomic_state	2022-12-16 10:23:11 +01:00
drm_prime.h	drm/prime: Unexport helpers for fd/handle conversion	2023-06-26 11:08:46 +02:00
drm_print.h	Merge tag 'amd-drm-next-6.3-2023-01-27' of https://gitlab.freedesktop.org/agd5f/linux into drm-next	2023-01-30 15:37:57 +10:00
drm_privacy_screen_consumer.h	…
drm_privacy_screen_driver.h	drm/privacy_screen: Add drvdata in drm_privacy_screen	2022-01-10 12:17:37 +01:00
drm_privacy_screen_machine.h	…
drm_probe_helper.h	drm: Add an HPD poll helper to reschedule the poll work	2023-08-23 17:14:37 -04:00
drm_property.h	…
drm_rect.h	drm/rect: Add DRM_RECT_INIT() macro	2022-06-27 13:45:48 +02:00
drm_self_refresh_helper.h	…
drm_simple_kms_helper.h	drm/simple-kms: Remove drm_gem_simple_display_pipe_prepare_fb()	2022-12-05 13:35:37 +01:00
drm_suballoc.h	drm/suballoc: Extract amdgpu_sa.c as generic suballocation helper	2023-03-01 17:18:19 +01:00
drm_syncobj.h	drm/syncobj: add IOCTL to register an eventfd	2023-07-20 12:01:03 +02:00
drm_sysfs.h	drm/sysfs: rename drm_sysfs_connector_status_event()	2023-06-23 15:54:00 +02:00
drm_util.h	…
drm_utils.h	…
drm_vblank.h	drm/vblank: Add helper to get next vblank time	2023-03-28 14:52:59 -07:00
drm_vblank_work.h	…
drm_vma_manager.h	drm/drm_vma_manager: Add drm_vma_node_allow_once()	2023-01-19 14:16:55 +01:00
drm_writeback.h	drm: introduce drm_writeback_connector_init_with_encoder() API	2022-05-02 02:12:59 +03:00
gma_drm.h	…
gpu_scheduler.h	Linux 6.5-rc1	2023-07-11 09:23:20 +02:00
gud.h	…
i915_component.h	drm/i915/mtl: Define GSC Proxy component interface	2023-05-04 02:57:28 -07:00
i915_drm.h	drm/i915_drm.h: fix a typo	2023-06-02 20:05:45 +03:00
i915_gsc_proxy_mei_interface.h	drm/i915/mtl: Define GSC Proxy component interface	2023-05-04 02:57:28 -07:00
i915_hdcp_interface.h	drm/i915/hdcp: Move away from master naming to arbiter	2023-05-31 10:22:13 +05:30
i915_pciids.h	drm/i915: Add new DG2 PCI IDs	2023-10-12 10:48:15 -07:00
i915_pxp_tee_interface.h	mei: pxp: add command streamer API to the PXP driver	2022-10-03 11:29:11 -07:00
intel-gtt.h	agp/intel: Rename intel-gtt symbols	2022-06-22 15:52:55 -07:00
intel_lpe_audio.h	…
spsc_queue.h	…
task_barrier.h	drm: Spelling s/randevouz/rendez-vous/	2023-07-29 21:11:54 +02:00