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_crtc_state *old_crtc_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_crtc_state *old_crtc_state)
 47{
 48	struct drm_device *dev = crtc->dev;
 49	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 50
 51	/* always disable planes on the CRTC */
 52	drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, true);
 53
 54	drm_crtc_vblank_off(crtc);
 55
 56	regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
 57			   DCU_MODE_DCU_MODE_MASK,
 58			   DCU_MODE_DCU_MODE(DCU_MODE_OFF));
 59	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 60		     DCU_UPDATE_MODE_READREG);
 61	clk_disable_unprepare(fsl_dev->pix_clk);
 62}
 63
 64static void fsl_dcu_drm_crtc_atomic_enable(struct drm_crtc *crtc,
 65					   struct drm_crtc_state *old_state)
 66{
 67	struct drm_device *dev = crtc->dev;
 68	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 69
 70	clk_prepare_enable(fsl_dev->pix_clk);
 71	regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
 72			   DCU_MODE_DCU_MODE_MASK,
 73			   DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
 74	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 75		     DCU_UPDATE_MODE_READREG);
 76
 77	drm_crtc_vblank_on(crtc);
 78}
 79
 80static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
 81{
 82	struct drm_device *dev = crtc->dev;
 83	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 84	struct drm_connector *con = &fsl_dev->connector.base;
 85	struct drm_display_mode *mode = &crtc->state->mode;
 86	unsigned int pol = 0;
 87	struct videomode vm;
 88
 89	clk_set_rate(fsl_dev->pix_clk, mode->clock * 1000);
 90
 91	drm_display_mode_to_videomode(mode, &vm);
 92
 93	/* INV_PXCK as default (most display sample data on rising edge) */
 94	if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE))
 95		pol |= DCU_SYN_POL_INV_PXCK;
 96
 97	if (vm.flags & DISPLAY_FLAGS_HSYNC_LOW)
 98		pol |= DCU_SYN_POL_INV_HS_LOW;
 99
100	if (vm.flags & DISPLAY_FLAGS_VSYNC_LOW)
101		pol |= DCU_SYN_POL_INV_VS_LOW;
102
103	regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
104		     DCU_HSYN_PARA_BP(vm.hback_porch) |
105		     DCU_HSYN_PARA_PW(vm.hsync_len) |
106		     DCU_HSYN_PARA_FP(vm.hfront_porch));
107	regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
108		     DCU_VSYN_PARA_BP(vm.vback_porch) |
109		     DCU_VSYN_PARA_PW(vm.vsync_len) |
110		     DCU_VSYN_PARA_FP(vm.vfront_porch));
111	regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
112		     DCU_DISP_SIZE_DELTA_Y(vm.vactive) |
113		     DCU_DISP_SIZE_DELTA_X(vm.hactive));
114	regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
115	regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
116		     DCU_BGND_G(0) | DCU_BGND_B(0));
117	regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
118		     DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
119	regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
120		     DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
121		     DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
122		     DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
123	return;
124}
125
126static const struct drm_crtc_helper_funcs fsl_dcu_drm_crtc_helper_funcs = {
127	.atomic_disable = fsl_dcu_drm_crtc_atomic_disable,
128	.atomic_flush = fsl_dcu_drm_crtc_atomic_flush,
129	.atomic_enable = fsl_dcu_drm_crtc_atomic_enable,
130	.mode_set_nofb = fsl_dcu_drm_crtc_mode_set_nofb,
131};
132
133static int fsl_dcu_drm_crtc_enable_vblank(struct drm_crtc *crtc)
134{
135	struct drm_device *dev = crtc->dev;
136	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
137	unsigned int value;
138
139	regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
140	value &= ~DCU_INT_MASK_VBLANK;
141	regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
142
143	return 0;
144}
145
146static void fsl_dcu_drm_crtc_disable_vblank(struct drm_crtc *crtc)
147{
148	struct drm_device *dev = crtc->dev;
149	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
150	unsigned int value;
151
152	regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
153	value |= DCU_INT_MASK_VBLANK;
154	regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
155}
156
157static const struct drm_crtc_funcs fsl_dcu_drm_crtc_funcs = {
158	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
159	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
160	.destroy = drm_crtc_cleanup,
161	.page_flip = drm_atomic_helper_page_flip,
162	.reset = drm_atomic_helper_crtc_reset,
163	.set_config = drm_atomic_helper_set_config,
164	.enable_vblank = fsl_dcu_drm_crtc_enable_vblank,
165	.disable_vblank = fsl_dcu_drm_crtc_disable_vblank,
166};
167
168int fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device *fsl_dev)
169{
170	struct drm_plane *primary;
171	struct drm_crtc *crtc = &fsl_dev->crtc;
172	int ret;
173
174	fsl_dcu_drm_init_planes(fsl_dev->drm);
175
176	primary = fsl_dcu_drm_primary_create_plane(fsl_dev->drm);
177	if (!primary)
178		return -ENOMEM;
179
180	ret = drm_crtc_init_with_planes(fsl_dev->drm, crtc, primary, NULL,
181					&fsl_dcu_drm_crtc_funcs, NULL);
182	if (ret) {
183		primary->funcs->destroy(primary);
184		return ret;
185	}
186
187	drm_crtc_helper_add(crtc, &fsl_dcu_drm_crtc_helper_funcs);
188
189	return 0;
190}