1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright 2015 Freescale Semiconductor, Inc.
  4 *
  5 * Freescale DCU drm device driver
  6 */
  7
  8#include <linux/clk.h>
  9#include <linux/regmap.h>
 10
 11#include <video/videomode.h>
 12
 13#include <drm/drm_atomic.h>
 14#include <drm/drm_atomic_helper.h>
 15#include <drm/drm_crtc.h>
 16#include <drm/drm_probe_helper.h>
 17#include <drm/drm_vblank.h>
 18
 19#include "fsl_dcu_drm_crtc.h"
 20#include "fsl_dcu_drm_drv.h"
 21#include "fsl_dcu_drm_plane.h"
 22
 23static void fsl_dcu_drm_crtc_atomic_flush(struct drm_crtc *crtc,
 24					  struct drm_atomic_state *state)
 25{
 26	struct drm_device *dev = crtc->dev;
 27	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 28	struct drm_pending_vblank_event *event = crtc->state->event;
 29
 30	regmap_write(fsl_dev->regmap,
 31		     DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
 32
 33	if (event) {
 34		crtc->state->event = NULL;
 35
 36		spin_lock_irq(&crtc->dev->event_lock);
 37		if (drm_crtc_vblank_get(crtc) == 0)
 38			drm_crtc_arm_vblank_event(crtc, event);
 39		else
 40			drm_crtc_send_vblank_event(crtc, event);
 41		spin_unlock_irq(&crtc->dev->event_lock);
 42	}
 43}
 44
 45static void fsl_dcu_drm_crtc_atomic_disable(struct drm_crtc *crtc,
 46					struct drm_atomic_state *state)
 47{
 48	struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
 49									      crtc);
 50	struct drm_device *dev = crtc->dev;
 51	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 52
 53	/* always disable planes on the CRTC */
 54	drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, true);
 55
 56	drm_crtc_vblank_off(crtc);
 57
 58	regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
 59			   DCU_MODE_DCU_MODE_MASK,
 60			   DCU_MODE_DCU_MODE(DCU_MODE_OFF));
 61	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 62		     DCU_UPDATE_MODE_READREG);
 63	clk_disable_unprepare(fsl_dev->pix_clk);
 64}
 65
 66static void fsl_dcu_drm_crtc_atomic_enable(struct drm_crtc *crtc,
 67					   struct drm_atomic_state *state)
 68{
 69	struct drm_device *dev = crtc->dev;
 70	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 71
 72	clk_prepare_enable(fsl_dev->pix_clk);
 73	regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
 74			   DCU_MODE_DCU_MODE_MASK,
 75			   DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
 76	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 77		     DCU_UPDATE_MODE_READREG);
 78
 79	drm_crtc_vblank_on(crtc);
 80}
 81
 82static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
 83{
 84	struct drm_device *dev = crtc->dev;
 85	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 86	struct drm_connector *con = &fsl_dev->connector.base;
 87	struct drm_display_mode *mode = &crtc->state->mode;
 88	unsigned int pol = 0;
 89	struct videomode vm;
 90
 91	clk_set_rate(fsl_dev->pix_clk, mode->clock * 1000);
 92
 93	drm_display_mode_to_videomode(mode, &vm);
 94
 95	/* INV_PXCK as default (most display sample data on rising edge) */
 96	if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE))
 97		pol |= DCU_SYN_POL_INV_PXCK;
 98
 99	if (vm.flags & DISPLAY_FLAGS_HSYNC_LOW)
100		pol |= DCU_SYN_POL_INV_HS_LOW;
101
102	if (vm.flags & DISPLAY_FLAGS_VSYNC_LOW)
103		pol |= DCU_SYN_POL_INV_VS_LOW;
104
105	regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
106		     DCU_HSYN_PARA_BP(vm.hback_porch) |
107		     DCU_HSYN_PARA_PW(vm.hsync_len) |
108		     DCU_HSYN_PARA_FP(vm.hfront_porch));
109	regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
110		     DCU_VSYN_PARA_BP(vm.vback_porch) |
111		     DCU_VSYN_PARA_PW(vm.vsync_len) |
112		     DCU_VSYN_PARA_FP(vm.vfront_porch));
113	regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
114		     DCU_DISP_SIZE_DELTA_Y(vm.vactive) |
115		     DCU_DISP_SIZE_DELTA_X(vm.hactive));
116	regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
117	regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
118		     DCU_BGND_G(0) | DCU_BGND_B(0));
119	regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
120		     DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
121	regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
122		     DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
123		     DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
124		     DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
125	return;
126}
127
128static const struct drm_crtc_helper_funcs fsl_dcu_drm_crtc_helper_funcs = {
129	.atomic_disable = fsl_dcu_drm_crtc_atomic_disable,
130	.atomic_flush = fsl_dcu_drm_crtc_atomic_flush,
131	.atomic_enable = fsl_dcu_drm_crtc_atomic_enable,
132	.mode_set_nofb = fsl_dcu_drm_crtc_mode_set_nofb,
133};
134
135static int fsl_dcu_drm_crtc_enable_vblank(struct drm_crtc *crtc)
136{
137	struct drm_device *dev = crtc->dev;
138	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
139	unsigned int value;
140
141	regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
142	value &= ~DCU_INT_MASK_VBLANK;
143	regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
144
145	return 0;
146}
147
148static void fsl_dcu_drm_crtc_disable_vblank(struct drm_crtc *crtc)
149{
150	struct drm_device *dev = crtc->dev;
151	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
152	unsigned int value;
153
154	regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
155	value |= DCU_INT_MASK_VBLANK;
156	regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
157}
158
159static const struct drm_crtc_funcs fsl_dcu_drm_crtc_funcs = {
160	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
161	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
162	.destroy = drm_crtc_cleanup,
163	.page_flip = drm_atomic_helper_page_flip,
164	.reset = drm_atomic_helper_crtc_reset,
165	.set_config = drm_atomic_helper_set_config,
166	.enable_vblank = fsl_dcu_drm_crtc_enable_vblank,
167	.disable_vblank = fsl_dcu_drm_crtc_disable_vblank,
168};
169
170int fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device *fsl_dev)
171{
172	struct drm_plane *primary;
173	struct drm_crtc *crtc = &fsl_dev->crtc;
174	int ret;
175
176	fsl_dcu_drm_init_planes(fsl_dev->drm);
177
178	primary = fsl_dcu_drm_primary_create_plane(fsl_dev->drm);
179	if (!primary)
180		return -ENOMEM;
181
182	ret = drm_crtc_init_with_planes(fsl_dev->drm, crtc, primary, NULL,
183					&fsl_dcu_drm_crtc_funcs, NULL);
184	if (ret) {
185		primary->funcs->destroy(primary);
186		return ret;
187	}
188
189	drm_crtc_helper_add(crtc, &fsl_dcu_drm_crtc_helper_funcs);
190
191	return 0;
192}