The first patch trims backlight_update_status() so it can be called with a NULL backlight_device. Then the caller do not need to add this check just to avoid a NULL reference.
The backlight drivers uses several different patterns when registering a backlight: - Register backlight and assign properties later - Define a local backlight_properties variable and use memset - Define a const backlight_properties and assign relevant properties On top of this there was differences in what members was assigned. To align how backlight drivers are initialized introduce following helper macros: - DECLARE_BACKLIGHT_INIT_FIRMWARE() - DECLARE_BACKLIGHT_INIT_PLATFORM() - DECLARE_BACKLIGHT_INIT_RAW() The macros are introduced in patch 2. The backlight drivers used direct access to backlight_properties. Encapsulate these in get/set access operations resulting in following benefits: - The access methods can be called with a NULL pointer so logic around the access can be made simpler. - The update_brightness and enable_brightness simplifies the users - The code is in most cases more readable with the access operations. - When everyone uses the access methods refactoring in the backlight core is simpler. The get/set operations are introduced in patch 3. The gpio backlight driver received a small overhaul in a set of three patches. The result is a smaller and more readable driver. The remaining patches updates all backlight users in drivers/gpu/drm/* With this patch set all of drivers/gpu/drm/: - All backlight references to FB_BLANK* are gone from drm/* - All direct references to backlight properties are gone - All panel drivers uses the devm_ variant for registering backlight Daniel Vetter had some concerns with this for future updates, but we are aligned now and can update if refoctoring demands it - All panel drivers uses the backlight support in drm_panel Individual patches are only sent to the people listed in the patch + a few more. Please check https://lore.kernel.org/dri-devel/ for the full series. v2: - Documented BACKLIGHT_PROPS as it may be used by drivers - Dropped backlight_set_power_{on,off}, they were a mistake (Daniel) - Added backlight_update_brightness() and use it (Daniel) - Added backlight_enable_brightness() and use it - Moved remaining drm_panel driver to use backlight support in drm_panel - gpio backlight driver overhaul The patches are made on top of the for-backlight-next branch at https://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight.git The branch needs v5.8-rc1 backported to build as dev_err_probe() is used. The first 6 patches are candidates for the backlight tree. If they are applied then this should preferably be to an immutable branch we can merge to drm-misc-next where the drm patches shall go. The drm patches has known conflics and shall *not* be applied to the backlight tree, they are included in this patchset to show how the new functions are used. Diffstat for the drm bits alone looks nice: 25 files changed, 243 insertions(+), 460 deletions(-) Feedback welcome! Sam Cc: Alex Deucher <alexander.deuc...@amd.com> Cc: amd-...@lists.freedesktop.org Cc: Andrzej Hajda <a.ha...@samsung.com> Cc: Christian König <christian.koe...@amd.com> Cc: Chris Wilson <ch...@chris-wilson.co.uk> Cc: Daniel Thompson <daniel.thomp...@linaro.org> Cc: Ezequiel Garcia <ezequ...@vanguardiasur.com.ar> Cc: Hans de Goede <hdego...@redhat.com> Cc: Hoegeun Kwon <hoegeun.k...@samsung.com> Cc: Inki Dae <inki....@samsung.com> Cc: Jani Nikula <jani.nik...@linux.intel.com> Cc: Jernej Skrabec <jernej.skra...@siol.net> Cc: Jingoo Han <jingooh...@gmail.com> Cc: Jonas Karlman <jo...@kwiboo.se> Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com> Cc: Jyri Sarha <jsa...@ti.com> Cc: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com> Cc: Konrad Dybcio <konradyb...@gmail.com> Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com> Cc: Lee Jones <lee.jo...@linaro.org> Cc: Linus Walleij <linus.wall...@linaro.org> Cc: linux-renesas-...@vger.kernel.org Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com> Cc: Manasi Navare <manasi.d.nav...@intel.com> Cc: Neil Armstrong <narmstr...@baylibre.com> Cc: Patrik Jakobsson <patrik.r.jakobs...@gmail.com> Cc: Paweł Chmiel <pawel.mikolaj.chm...@gmail.com> Cc: Philippe CORNU <philippe.co...@st.com> Cc: Rob Clark <robdcl...@gmail.com> Cc: Robert Chiras <robert.chi...@nxp.com> Cc: Rodrigo Vivi <rodrigo.v...@intel.com> Cc: Sam Ravnborg <s...@ravnborg.org> Cc: Sebastian Reichel <sebastian.reic...@collabora.com> Cc: Thierry Reding <thierry.red...@gmail.com> Cc: Tomi Valkeinen <tomi.valkei...@ti.com> Cc: "Ville Syrjälä" <ville.syrj...@linux.intel.com> Cc: Vinay Simha BN <simha...@gmail.com> Cc: Wambui Karuga <wambui.karu...@gmail.com> Cc: Zheng Bin <zhengbi...@huawei.com> Sam Ravnborg (24): backlight: Silently fail backlight_update_status() if no device backlight: Add DECLARE_* macro for device registration backlight: Add get/set operations for brightness properties backlight: gpio: Introduce backlight_{enable,disable} backlight: gpio: Use dev_err_probe() backlight: gpio: Use DECLARE_BACKLIGHT_INIT_RAW drm/gma500: Backlight update drm/panel: asus-z00t-tm5p5-n35596: Backlight update drm/panel: jdi-lt070me05000: Backlight update drm/panel: novatek-nt35510: Backlight update drm/panel: orisetech-otm8009a: Backlight update drm/panel: raydium-rm67191: Backlight update drm/panel: samsung-s6e63m0: Backlight update drm/panel: samsung-s6e63j0x03: Backlight update drm/panel: samsung-s6e3ha2: Backlight update drm/panel: sony-acx424akp: Backlight update drm/panel: sony-acx565akm: Backlight update drm/bridge: parade-ps8622: Backlight update drm/tilcdc: Backlight update drm/radeon: Backlight update drm/amdgpu/atom: Backlight update drm/i915: Backlight update drm/omap: display: Backlight update drm/shmobile: Backlight update drivers/gpu/drm/amd/amdgpu/atombios_encoders.c | 19 +-- drivers/gpu/drm/bridge/parade-ps8622.c | 43 ++++--- drivers/gpu/drm/gma500/backlight.c | 34 +---- drivers/gpu/drm/gma500/cdv_device.c | 24 ++-- drivers/gpu/drm/gma500/mdfld_device.c | 9 +- drivers/gpu/drm/gma500/oaktrail_device.c | 10 +- drivers/gpu/drm/gma500/opregion.c | 2 +- drivers/gpu/drm/gma500/psb_device.c | 10 +- drivers/gpu/drm/gma500/psb_drv.c | 7 +- drivers/gpu/drm/i915/display/intel_panel.c | 88 ++++++------- drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c | 37 +----- .../gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c | 15 +-- drivers/gpu/drm/panel/panel-jdi-lt070me05000.c | 54 ++------ drivers/gpu/drm/panel/panel-novatek-nt35510.c | 9 +- drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 14 +-- drivers/gpu/drm/panel/panel-raydium-rm67191.c | 11 +- drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c | 70 +++++------ drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c | 53 ++++---- drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 25 ++-- drivers/gpu/drm/panel/panel-sony-acx424akp.c | 49 ++------ drivers/gpu/drm/panel/panel-sony-acx565akm.c | 47 +++---- drivers/gpu/drm/radeon/atombios_encoders.c | 24 ++-- drivers/gpu/drm/radeon/radeon_legacy_encoders.c | 16 +-- drivers/gpu/drm/shmobile/shmob_drm_backlight.c | 20 ++- drivers/gpu/drm/tilcdc/tilcdc_panel.c | 9 +- drivers/video/backlight/gpio_backlight.c | 41 +++--- include/linux/backlight.h | 140 +++++++++++++++++++++ 27 files changed, 400 insertions(+), 480 deletions(-) _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
