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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019-2022 Bootlin
* Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
*/
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_drv.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_print.h>
#include <drm/drm_vblank.h>
#include "logicvc_crtc.h"
#include "logicvc_drm.h"
#include "logicvc_interface.h"
#include "logicvc_layer.h"
#include "logicvc_regs.h"
#define logicvc_crtc(c) \
container_of(c, struct logicvc_crtc, drm_crtc)
static enum drm_mode_status
logicvc_crtc_mode_valid(struct drm_crtc *drm_crtc,
const struct drm_display_mode *mode)
{
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
return -EINVAL;
return 0;
}
static void logicvc_crtc_atomic_begin(struct drm_crtc *drm_crtc,
struct drm_atomic_state *state)
{
struct logicvc_crtc *crtc = logicvc_crtc(drm_crtc);
struct drm_crtc_state *old_state =
drm_atomic_get_old_crtc_state(state, drm_crtc);
struct drm_device *drm_dev = drm_crtc->dev;
unsigned long flags;
/*
* We need to grab the pending event here if vblank was already enabled
* since we won't get a call to atomic_enable to grab it.
*/
if (drm_crtc->state->event && old_state->active) {
spin_lock_irqsave(&drm_dev->event_lock, flags);
WARN_ON(drm_crtc_vblank_get(drm_crtc) != 0);
crtc->event = drm_crtc->state->event;
drm_crtc->state->event = NULL;
spin_unlock_irqrestore(&drm_dev->event_lock, flags);
}
}
static void logicvc_crtc_atomic_enable(struct drm_crtc *drm_crtc,
struct drm_atomic_state *state)
{
struct logicvc_crtc *crtc = logicvc_crtc(drm_crtc);
struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
struct drm_crtc_state *old_state =
drm_atomic_get_old_crtc_state(state, drm_crtc);
struct drm_crtc_state *new_state =
drm_atomic_get_new_crtc_state(state, drm_crtc);
struct drm_display_mode *mode = &new_state->adjusted_mode;
struct drm_device *drm_dev = drm_crtc->dev;
unsigned int hact, hfp, hsl, hbp;
unsigned int vact, vfp, vsl, vbp;
unsigned long flags;
u32 ctrl;
/* Timings */
hact = mode->hdisplay;
hfp = mode->hsync_start - mode->hdisplay;
hsl = mode->hsync_end - mode->hsync_start;
hbp = mode->htotal - mode->hsync_end;
vact = mode->vdisplay;
vfp = mode->vsync_start - mode->vdisplay;
vsl = mode->vsync_end - mode->vsync_start;
vbp = mode->vtotal - mode->vsync_end;
regmap_write(logicvc->regmap, LOGICVC_HSYNC_FRONT_PORCH_REG, hfp - 1);
regmap_write(logicvc->regmap, LOGICVC_HSYNC_REG, hsl - 1);
regmap_write(logicvc->regmap, LOGICVC_HSYNC_BACK_PORCH_REG, hbp - 1);
regmap_write(logicvc->regmap, LOGICVC_HRES_REG, hact - 1);
regmap_write(logicvc->regmap, LOGICVC_VSYNC_FRONT_PORCH_REG, vfp - 1);
regmap_write(logicvc->regmap, LOGICVC_VSYNC_REG, vsl - 1);
regmap_write(logicvc->regmap, LOGICVC_VSYNC_BACK_PORCH_REG, vbp - 1);
regmap_write(logicvc->regmap, LOGICVC_VRES_REG, vact - 1);
/* Signals */
ctrl = LOGICVC_CTRL_HSYNC_ENABLE | LOGICVC_CTRL_VSYNC_ENABLE |
LOGICVC_CTRL_DE_ENABLE;
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
ctrl |= LOGICVC_CTRL_HSYNC_INVERT;
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
ctrl |= LOGICVC_CTRL_VSYNC_INVERT;
if (logicvc->interface) {
struct drm_connector *connector =
&logicvc->interface->drm_connector;
struct drm_display_info *display_info =
&connector->display_info;
if (display_info->bus_flags & DRM_BUS_FLAG_DE_LOW)
ctrl |= LOGICVC_CTRL_DE_INVERT;
if (display_info->bus_flags &
DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
ctrl |= LOGICVC_CTRL_CLOCK_INVERT;
}
regmap_update_bits(logicvc->regmap, LOGICVC_CTRL_REG,
LOGICVC_CTRL_HSYNC_ENABLE |
LOGICVC_CTRL_HSYNC_INVERT |
LOGICVC_CTRL_VSYNC_ENABLE |
LOGICVC_CTRL_VSYNC_INVERT |
LOGICVC_CTRL_DE_ENABLE |
LOGICVC_CTRL_DE_INVERT |
LOGICVC_CTRL_PIXEL_INVERT |
LOGICVC_CTRL_CLOCK_INVERT, ctrl);
/* Generate internal state reset. */
regmap_write(logicvc->regmap, LOGICVC_DTYPE_REG, 0);
drm_crtc_vblank_on(drm_crtc);
/* Register our event after vblank is enabled. */
if (drm_crtc->state->event && !old_state->active) {
spin_lock_irqsave(&drm_dev->event_lock, flags);
WARN_ON(drm_crtc_vblank_get(drm_crtc) != 0);
crtc->event = drm_crtc->state->event;
drm_crtc->state->event = NULL;
spin_unlock_irqrestore(&drm_dev->event_lock, flags);
}
}
static void logicvc_crtc_atomic_disable(struct drm_crtc *drm_crtc,
struct drm_atomic_state *state)
{
struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
struct drm_device *drm_dev = drm_crtc->dev;
drm_crtc_vblank_off(drm_crtc);
/* Disable and clear CRTC bits. */
regmap_update_bits(logicvc->regmap, LOGICVC_CTRL_REG,
LOGICVC_CTRL_HSYNC_ENABLE |
LOGICVC_CTRL_HSYNC_INVERT |
LOGICVC_CTRL_VSYNC_ENABLE |
LOGICVC_CTRL_VSYNC_INVERT |
LOGICVC_CTRL_DE_ENABLE |
LOGICVC_CTRL_DE_INVERT |
LOGICVC_CTRL_PIXEL_INVERT |
LOGICVC_CTRL_CLOCK_INVERT, 0);
/* Generate internal state reset. */
regmap_write(logicvc->regmap, LOGICVC_DTYPE_REG, 0);
/* Consume any leftover event since vblank is now disabled. */
if (drm_crtc->state->event && !drm_crtc->state->active) {
spin_lock_irq(&drm_dev->event_lock);
drm_crtc_send_vblank_event(drm_crtc, drm_crtc->state->event);
drm_crtc->state->event = NULL;
spin_unlock_irq(&drm_dev->event_lock);
}
}
static const struct drm_crtc_helper_funcs logicvc_crtc_helper_funcs = {
.mode_valid = logicvc_crtc_mode_valid,
.atomic_begin = logicvc_crtc_atomic_begin,
.atomic_enable = logicvc_crtc_atomic_enable,
.atomic_disable = logicvc_crtc_atomic_disable,
};
static int logicvc_crtc_enable_vblank(struct drm_crtc *drm_crtc)
{
struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
/* Clear any pending V_SYNC interrupt. */
regmap_write_bits(logicvc->regmap, LOGICVC_INT_STAT_REG,
LOGICVC_INT_STAT_V_SYNC, LOGICVC_INT_STAT_V_SYNC);
/* Unmask V_SYNC interrupt. */
regmap_write_bits(logicvc->regmap, LOGICVC_INT_MASK_REG,
LOGICVC_INT_MASK_V_SYNC, 0);
return 0;
}
static void logicvc_crtc_disable_vblank(struct drm_crtc *drm_crtc)
{
struct logicvc_drm *logicvc = logicvc_drm(drm_crtc->dev);
/* Mask V_SYNC interrupt. */
regmap_write_bits(logicvc->regmap, LOGICVC_INT_MASK_REG,
LOGICVC_INT_MASK_V_SYNC, LOGICVC_INT_MASK_V_SYNC);
}
static const struct drm_crtc_funcs logicvc_crtc_funcs = {
.reset = drm_atomic_helper_crtc_reset,
.destroy = drm_crtc_cleanup,
.set_config = drm_atomic_helper_set_config,
.page_flip = drm_atomic_helper_page_flip,
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
.enable_vblank = logicvc_crtc_enable_vblank,
.disable_vblank = logicvc_crtc_disable_vblank,
};
void logicvc_crtc_vblank_handler(struct logicvc_drm *logicvc)
{
struct drm_device *drm_dev = &logicvc->drm_dev;
struct logicvc_crtc *crtc = logicvc->crtc;
unsigned long flags;
if (!crtc)
return;
drm_crtc_handle_vblank(&crtc->drm_crtc);
if (crtc->event) {
spin_lock_irqsave(&drm_dev->event_lock, flags);
drm_crtc_send_vblank_event(&crtc->drm_crtc, crtc->event);
drm_crtc_vblank_put(&crtc->drm_crtc);
crtc->event = NULL;
spin_unlock_irqrestore(&drm_dev->event_lock, flags);
}
}
int logicvc_crtc_init(struct logicvc_drm *logicvc)
{
struct drm_device *drm_dev = &logicvc->drm_dev;
struct device *dev = drm_dev->dev;
struct device_node *of_node = dev->of_node;
struct logicvc_crtc *crtc;
struct logicvc_layer *layer_primary;
int ret;
crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
if (!crtc)
return -ENOMEM;
layer_primary = logicvc_layer_get_primary(logicvc);
if (!layer_primary) {
drm_err(drm_dev, "Failed to get primary layer\n");
return -EINVAL;
}
ret = drm_crtc_init_with_planes(drm_dev, &crtc->drm_crtc,
&layer_primary->drm_plane, NULL,
&logicvc_crtc_funcs, NULL);
if (ret) {
drm_err(drm_dev, "Failed to initialize CRTC\n");
return ret;
}
drm_crtc_helper_add(&crtc->drm_crtc, &logicvc_crtc_helper_funcs);
crtc->drm_crtc.port = of_graph_get_port_by_id(of_node, 1);
logicvc->crtc = crtc;
return 0;
}
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