// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2012 Red Hat * * based in parts on udlfb.c: * Copyright (C) 2009 Roberto De Ioris <[email protected]> * Copyright (C) 2009 Jaya Kumar <[email protected]> * Copyright (C) 2009 Bernie Thompson <[email protected]> */ #include <linux/bitfield.h> #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_crtc_helper.h> #include <drm/drm_damage_helper.h> #include <drm/drm_drv.h> #include <drm/drm_edid.h> #include <drm/drm_fourcc.h> #include <drm/drm_gem_atomic_helper.h> #include <drm/drm_gem_framebuffer_helper.h> #include <drm/drm_gem_shmem_helper.h> #include <drm/drm_modeset_helper_vtables.h> #include <drm/drm_probe_helper.h> #include <drm/drm_vblank.h> #include "udl_drv.h" #include "udl_edid.h" #include "udl_proto.h" /* * All DisplayLink bulk operations start with 0xaf (UDL_MSG_BULK), followed by * a specific command code. All operations are written to a command buffer, which * the driver sends to the device. */ static char *udl_set_register(char *buf, u8 reg, u8 val) { … } static char *udl_vidreg_lock(char *buf) { … } static char *udl_vidreg_unlock(char *buf) { … } static char *udl_set_blank_mode(char *buf, u8 mode) { … } static char *udl_set_color_depth(char *buf, u8 selection) { … } static char *udl_set_base16bpp(char *buf, u32 base) { … } /* * DisplayLink HW has separate 16bpp and 8bpp framebuffers. * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer */ static char *udl_set_base8bpp(char *buf, u32 base) { … } static char *udl_set_register_16(char *wrptr, u8 reg, u16 value) { … } /* * This is kind of weird because the controller takes some * register values in a different byte order than other registers. */ static char *udl_set_register_16be(char *wrptr, u8 reg, u16 value) { … } /* * LFSR is linear feedback shift register. The reason we have this is * because the display controller needs to minimize the clock depth of * various counters used in the display path. So this code reverses the * provided value into the lfsr16 value by counting backwards to get * the value that needs to be set in the hardware comparator to get the * same actual count. This makes sense once you read above a couple of * times and think about it from a hardware perspective. */ static u16 udl_lfsr16(u16 actual_count) { … } /* * This does LFSR conversion on the value that is to be written. * See LFSR explanation above for more detail. */ static char *udl_set_register_lfsr16(char *wrptr, u8 reg, u16 value) { … } /* * Takes a DRM display mode and converts it into the DisplayLink * equivalent register commands. */ static char *udl_set_display_mode(char *buf, struct drm_display_mode *mode) { … } static char *udl_dummy_render(char *wrptr) { … } static long udl_log_cpp(unsigned int cpp) { … } static int udl_handle_damage(struct drm_framebuffer *fb, const struct iosys_map *map, const struct drm_rect *clip) { … } /* * Primary plane */ static const uint32_t udl_primary_plane_formats[] = …; static const uint64_t udl_primary_plane_fmtmods[] = …; static int udl_primary_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state) { … } static void udl_primary_plane_helper_atomic_update(struct drm_plane *plane, struct drm_atomic_state *state) { … } static const struct drm_plane_helper_funcs udl_primary_plane_helper_funcs = …; static const struct drm_plane_funcs udl_primary_plane_funcs = …; /* * CRTC */ static void udl_crtc_helper_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } static void udl_crtc_helper_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } static const struct drm_crtc_helper_funcs udl_crtc_helper_funcs = …; static const struct drm_crtc_funcs udl_crtc_funcs = …; /* * Encoder */ static const struct drm_encoder_funcs udl_encoder_funcs = …; /* * Connector */ static int udl_connector_helper_get_modes(struct drm_connector *connector) { … } static int udl_connector_helper_detect_ctx(struct drm_connector *connector, struct drm_modeset_acquire_ctx *ctx, bool force) { … } static const struct drm_connector_helper_funcs udl_connector_helper_funcs = …; static const struct drm_connector_funcs udl_connector_funcs = …; /* * Modesetting */ static enum drm_mode_status udl_mode_config_mode_valid(struct drm_device *dev, const struct drm_display_mode *mode) { … } static const struct drm_mode_config_funcs udl_mode_config_funcs = …; int udl_modeset_init(struct drm_device *dev) { … }
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