cregit-Linux how code gets into the kernel

Release 4.18 drivers/gpu/drm/nouveau/nvkm/engine/disp/headgv100.c

/*
 * Copyright 2018 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
#include "head.h"


static void gv100_head_vblank_put(struct nvkm_head *head) { struct nvkm_device *device = head->disp->engine.subdev.device; nvkm_mask(device, 0x611d80 + (head->id * 4), 0x00000004, 0x00000000); }

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static void gv100_head_vblank_get(struct nvkm_head *head) { struct nvkm_device *device = head->disp->engine.subdev.device; nvkm_mask(device, 0x611d80 + (head->id * 4), 0x00000004, 0x00000004); }

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static void gv100_head_rgpos(struct nvkm_head *head, u16 *hline, u16 *vline) { struct nvkm_device *device = head->disp->engine.subdev.device; const u32 hoff = head->id * 0x800; /* vline read locks hline. */ *vline = nvkm_rd32(device, 0x616330 + hoff) & 0x0000ffff; *hline = nvkm_rd32(device, 0x616334 + hoff) & 0x0000ffff; }

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static void gv100_head_state(struct nvkm_head *head, struct nvkm_head_state *state) { struct nvkm_device *device = head->disp->engine.subdev.device; const u32 hoff = (state == &head->arm) * 0x8000 + head->id * 0x400; u32 data; data = nvkm_rd32(device, 0x682064 + hoff); state->vtotal = (data & 0xffff0000) >> 16; state->htotal = (data & 0x0000ffff); data = nvkm_rd32(device, 0x682068 + hoff); state->vsynce = (data & 0xffff0000) >> 16; state->hsynce = (data & 0x0000ffff); data = nvkm_rd32(device, 0x68206c + hoff); state->vblanke = (data & 0xffff0000) >> 16; state->hblanke = (data & 0x0000ffff); data = nvkm_rd32(device, 0x682070 + hoff); state->vblanks = (data & 0xffff0000) >> 16; state->hblanks = (data & 0x0000ffff); state->hz = nvkm_rd32(device, 0x68200c + hoff); data = nvkm_rd32(device, 0x682004 + hoff); switch ((data & 0x000000f0) >> 4) { case 5: state->or.depth = 30; break; case 4: state->or.depth = 24; break; case 1: state->or.depth = 18; break; default: state->or.depth = 18; WARN_ON(1); break; } }

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static const struct nvkm_head_func gv100_head = { .state = gv100_head_state, .rgpos = gv100_head_rgpos, .rgclk = gf119_head_rgclk, .vblank_get = gv100_head_vblank_get, .vblank_put = gv100_head_vblank_put, };
int gv100_head_new(struct nvkm_disp *disp, int id) { struct nvkm_device *device = disp->engine.subdev.device; if (!(nvkm_rd32(device, 0x610060) & (0x00000001 << id))) return 0; return nvkm_head_new_(&gv100_head, disp, id); }

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int gv100_head_cnt(struct nvkm_disp *disp, unsigned long *pmask) { struct nvkm_device *device = disp->engine.subdev.device; *pmask = nvkm_rd32(device, 0x610060) & 0x000000ff; return nvkm_rd32(device, 0x610074) & 0x0000000f; }

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