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/*
* Copyright (C) 2014 Traphandler
* Copyright (C) 2014 Free Electrons
*
* Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/clk.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/pinctrl/consumer.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drmP.h>
#include <video/videomode.h>
#include "atmel_hlcdc_dc.h"
/**
* Atmel HLCDC CRTC state structure
*
* @base: base CRTC state
* @output_mode: RGBXXX output mode
*/
struct atmel_hlcdc_crtc_state {
struct drm_crtc_state base;
unsigned int output_mode;
};
static inline struct atmel_hlcdc_crtc_state *
drm_crtc_state_to_atmel_hlcdc_crtc_state(struct drm_crtc_state *state)
{
return container_of(state, struct atmel_hlcdc_crtc_state, base);
}
/**
* Atmel HLCDC CRTC structure
*
* @base: base DRM CRTC structure
* @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
* @event: pointer to the current page flip event
* @id: CRTC id (returned by drm_crtc_index)
*/
struct atmel_hlcdc_crtc {
struct drm_crtc base;
struct atmel_hlcdc_dc *dc;
struct drm_pending_vblank_event *event;
int id;
};
static inline struct atmel_hlcdc_crtc *
drm_crtc_to_atmel_hlcdc_crtc(struct drm_crtc *crtc)
{
return container_of(crtc, struct atmel_hlcdc_crtc, base);
}
static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
{
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
struct regmap *regmap = crtc->dc->hlcdc->regmap;
struct drm_display_mode *adj = &c->state->adjusted_mode;
struct atmel_hlcdc_crtc_state *state;
unsigned long mode_rate;
struct videomode vm;
unsigned long prate;
unsigned int cfg;
int div;
vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay;
vm.vback_porch = adj->crtc_vtotal - adj->crtc_vsync_end;
vm.vsync_len = adj->crtc_vsync_end - adj->crtc_vsync_start;
vm.hfront_porch = adj->crtc_hsync_start - adj->crtc_hdisplay;
vm.hback_porch = adj->crtc_htotal - adj->crtc_hsync_end;
vm.hsync_len = adj->crtc_hsync_end - adj->crtc_hsync_start;
regmap_write(regmap, ATMEL_HLCDC_CFG(1),
(vm.hsync_len - 1) | ((vm.vsync_len - 1) << 16));
regmap_write(regmap, ATMEL_HLCDC_CFG(2),
(vm.vfront_porch - 1) | (vm.vback_porch << 16));
regmap_write(regmap, ATMEL_HLCDC_CFG(3),
(vm.hfront_porch - 1) | ((vm.hback_porch - 1) << 16));
regmap_write(regmap, ATMEL_HLCDC_CFG(4),
(adj->crtc_hdisplay - 1) |
((adj->crtc_vdisplay - 1) << 16));
cfg = 0;
prate = clk_get_rate(crtc->dc->hlcdc->sys_clk);
mode_rate = adj->crtc_clock * 1000;
if ((prate / 2) < mode_rate) {
prate *= 2;
cfg |= ATMEL_HLCDC_CLKSEL;
}
div = DIV_ROUND_UP(prate, mode_rate);
if (div < 2)
div = 2;
cfg |= ATMEL_HLCDC_CLKDIV(div);
regmap_update_bits(regmap, ATMEL_HLCDC_CFG(0),
ATMEL_HLCDC_CLKSEL | ATMEL_HLCDC_CLKDIV_MASK |
ATMEL_HLCDC_CLKPOL, cfg);
cfg = 0;
if (adj->flags & DRM_MODE_FLAG_NVSYNC)
cfg |= ATMEL_HLCDC_VSPOL;
if (adj->flags & DRM_MODE_FLAG_NHSYNC)
cfg |= ATMEL_HLCDC_HSPOL;
state = drm_crtc_state_to_atmel_hlcdc_crtc_state(c->state);
cfg |= state->output_mode << 8;
regmap_update_bits(regmap, ATMEL_HLCDC_CFG(5),
ATMEL_HLCDC_HSPOL | ATMEL_HLCDC_VSPOL |
ATMEL_HLCDC_VSPDLYS | ATMEL_HLCDC_VSPDLYE |
ATMEL_HLCDC_DISPPOL | ATMEL_HLCDC_DISPDLY |
ATMEL_HLCDC_VSPSU | ATMEL_HLCDC_VSPHO |
ATMEL_HLCDC_GUARDTIME_MASK | ATMEL_HLCDC_MODE_MASK,
cfg);
}
static bool atmel_hlcdc_crtc_mode_fixup(struct drm_crtc *c,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
return atmel_hlcdc_dc_mode_valid(crtc->dc, adjusted_mode) == MODE_OK;
}
static void atmel_hlcdc_crtc_disable(struct drm_crtc *c)
{
struct drm_device *dev = c->dev;
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
struct regmap *regmap = crtc->dc->hlcdc->regmap;
unsigned int status;
drm_crtc_vblank_off(c);
pm_runtime_get_sync(dev->dev);
regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
(status & ATMEL_HLCDC_DISP))
cpu_relax();
regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC);
while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
(status & ATMEL_HLCDC_SYNC))
cpu_relax();
regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK);
while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
(status & ATMEL_HLCDC_PIXEL_CLK))
cpu_relax();
clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);
pinctrl_pm_select_sleep_state(dev->dev);
pm_runtime_allow(dev->dev);
pm_runtime_put_sync(dev->dev);
}
static void atmel_hlcdc_crtc_enable(struct drm_crtc *c)
{
struct drm_device *dev = c->dev;
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
struct regmap *regmap = crtc->dc->hlcdc->regmap;
unsigned int status;
pm_runtime_get_sync(dev->dev);
pm_runtime_forbid(dev->dev);
pinctrl_pm_select_default_state(dev->dev);
clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);
while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
!(status & ATMEL_HLCDC_PIXEL_CLK))
cpu_relax();
regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC);
while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
!(status & ATMEL_HLCDC_SYNC))
cpu_relax();
regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP);
while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
!(status & ATMEL_HLCDC_DISP))
cpu_relax();
pm_runtime_put_sync(dev->dev);
drm_crtc_vblank_on(c);
}
#define ATMEL_HLCDC_RGB444_OUTPUT BIT(0)
#define ATMEL_HLCDC_RGB565_OUTPUT BIT(1)
#define ATMEL_HLCDC_RGB666_OUTPUT BIT(2)
#define ATMEL_HLCDC_RGB888_OUTPUT BIT(3)
#define ATMEL_HLCDC_OUTPUT_MODE_MASK GENMASK(3, 0)
static int atmel_hlcdc_crtc_select_output_mode(struct drm_crtc_state *state)
{
unsigned int output_fmts = ATMEL_HLCDC_OUTPUT_MODE_MASK;
struct atmel_hlcdc_crtc_state *hstate;
struct drm_connector_state *cstate;
struct drm_connector *connector;
struct atmel_hlcdc_crtc *crtc;
int i;
crtc = drm_crtc_to_atmel_hlcdc_crtc(state->crtc);
for_each_connector_in_state(state->state, connector, cstate, i) {
struct drm_display_info *info = &connector->display_info;
unsigned int supported_fmts = 0;
int j;
if (!cstate->crtc)
continue;
for (j = 0; j < info->num_bus_formats; j++) {
switch (info->bus_formats[j]) {
case MEDIA_BUS_FMT_RGB444_1X12:
supported_fmts |= ATMEL_HLCDC_RGB444_OUTPUT;
break;
case MEDIA_BUS_FMT_RGB565_1X16:
supported_fmts |= ATMEL_HLCDC_RGB565_OUTPUT;
break;
case MEDIA_BUS_FMT_RGB666_1X18:
supported_fmts |= ATMEL_HLCDC_RGB666_OUTPUT;
break;
case MEDIA_BUS_FMT_RGB888_1X24:
supported_fmts |= ATMEL_HLCDC_RGB888_OUTPUT;
break;
default:
break;
}
}
if (crtc->dc->desc->conflicting_output_formats)
output_fmts &= supported_fmts;
else
output_fmts |= supported_fmts;
}
if (!output_fmts)
return -EINVAL;
hstate = drm_crtc_state_to_atmel_hlcdc_crtc_state(state);
hstate->output_mode = fls(output_fmts) - 1;
return 0;
}
static int atmel_hlcdc_crtc_atomic_check(struct drm_crtc *c,
struct drm_crtc_state *s)
{
int ret;
ret = atmel_hlcdc_crtc_select_output_mode(s);
if (ret)
return ret;
ret = atmel_hlcdc_plane_prepare_disc_area(s);
if (ret)
return ret;
return atmel_hlcdc_plane_prepare_ahb_routing(s);
}
static void atmel_hlcdc_crtc_atomic_begin(struct drm_crtc *c,
struct drm_crtc_state *old_s)
{
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
if (c->state->event) {
c->state->event->pipe = drm_crtc_index(c);
WARN_ON(drm_crtc_vblank_get(c) != 0);
crtc->event = c->state->event;
c->state->event = NULL;
}
}
static void atmel_hlcdc_crtc_atomic_flush(struct drm_crtc *crtc,
struct drm_crtc_state *old_s)
{
/* TODO: write common plane control register if available */
}
static const struct drm_crtc_helper_funcs lcdc_crtc_helper_funcs = {
.mode_fixup = atmel_hlcdc_crtc_mode_fixup,
.mode_set = drm_helper_crtc_mode_set,
.mode_set_nofb = atmel_hlcdc_crtc_mode_set_nofb,
.mode_set_base = drm_helper_crtc_mode_set_base,
.disable = atmel_hlcdc_crtc_disable,
.enable = atmel_hlcdc_crtc_enable,
.atomic_check = atmel_hlcdc_crtc_atomic_check,
.atomic_begin = atmel_hlcdc_crtc_atomic_begin,
.atomic_flush = atmel_hlcdc_crtc_atomic_flush,
};
static void atmel_hlcdc_crtc_destroy(struct drm_crtc *c)
{
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
drm_crtc_cleanup(c);
kfree(crtc);
}
static void atmel_hlcdc_crtc_finish_page_flip(struct atmel_hlcdc_crtc *crtc)
{
struct drm_device *dev = crtc->base.dev;
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
if (crtc->event) {
drm_crtc_send_vblank_event(&crtc->base, crtc->event);
drm_crtc_vblank_put(&crtc->base);
crtc->event = NULL;
}
spin_unlock_irqrestore(&dev->event_lock, flags);
}
void atmel_hlcdc_crtc_irq(struct drm_crtc *c)
{
drm_crtc_handle_vblank(c);
atmel_hlcdc_crtc_finish_page_flip(drm_crtc_to_atmel_hlcdc_crtc(c));
}
static void atmel_hlcdc_crtc_reset(struct drm_crtc *crtc)
{
struct atmel_hlcdc_crtc_state *state;
if (crtc->state) {
__drm_atomic_helper_crtc_destroy_state(crtc->state);
state = drm_crtc_state_to_atmel_hlcdc_crtc_state(crtc->state);
kfree(state);
crtc->state = NULL;
}
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (state) {
crtc->state = &state->base;
crtc->state->crtc = crtc;
}
}
static struct drm_crtc_state *
atmel_hlcdc_crtc_duplicate_state(struct drm_crtc *crtc)
{
struct atmel_hlcdc_crtc_state *state, *cur;
if (WARN_ON(!crtc->state))
return NULL;
state = kmalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return NULL;
__drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
cur = drm_crtc_state_to_atmel_hlcdc_crtc_state(crtc->state);
state->output_mode = cur->output_mode;
return &state->base;
}
static void atmel_hlcdc_crtc_destroy_state(struct drm_crtc *crtc,
struct drm_crtc_state *s)
{
struct atmel_hlcdc_crtc_state *state;
state = drm_crtc_state_to_atmel_hlcdc_crtc_state(s);
__drm_atomic_helper_crtc_destroy_state(s);
kfree(state);
}
static int atmel_hlcdc_crtc_enable_vblank(struct drm_crtc *c)
{
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
struct regmap *regmap = crtc->dc->hlcdc->regmap;
/* Enable SOF (Start Of Frame) interrupt for vblank counting */
regmap_write(regmap, ATMEL_HLCDC_IER, ATMEL_HLCDC_SOF);
return 0;
}
static void atmel_hlcdc_crtc_disable_vblank(struct drm_crtc *c)
{
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
struct regmap *regmap = crtc->dc->hlcdc->regmap;
regmap_write(regmap, ATMEL_HLCDC_IDR, ATMEL_HLCDC_SOF);
}
static const struct drm_crtc_funcs atmel_hlcdc_crtc_funcs = {
.page_flip = drm_atomic_helper_page_flip,
.set_config = drm_atomic_helper_set_config,
.destroy = atmel_hlcdc_crtc_destroy,
.reset = atmel_hlcdc_crtc_reset,
.atomic_duplicate_state = atmel_hlcdc_crtc_duplicate_state,
.atomic_destroy_state = atmel_hlcdc_crtc_destroy_state,
.enable_vblank = atmel_hlcdc_crtc_enable_vblank,
.disable_vblank = atmel_hlcdc_crtc_disable_vblank,
};
int atmel_hlcdc_crtc_create(struct drm_device *dev)
{
struct atmel_hlcdc_plane *primary = NULL, *cursor = NULL;
struct atmel_hlcdc_dc *dc = dev->dev_private;
struct atmel_hlcdc_crtc *crtc;
int ret;
int i;
crtc = kzalloc(sizeof(*crtc), GFP_KERNEL);
if (!crtc)
return -ENOMEM;
crtc->dc = dc;
for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
if (!dc->layers[i])
continue;
switch (dc->layers[i]->desc->type) {
case ATMEL_HLCDC_BASE_LAYER:
primary = atmel_hlcdc_layer_to_plane(dc->layers[i]);
break;
case ATMEL_HLCDC_CURSOR_LAYER:
cursor = atmel_hlcdc_layer_to_plane(dc->layers[i]);
break;
default:
break;
}
}
ret = drm_crtc_init_with_planes(dev, &crtc->base, &primary->base,
&cursor->base, &atmel_hlcdc_crtc_funcs,
NULL);
if (ret < 0)
goto fail;
crtc->id = drm_crtc_index(&crtc->base);
for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
struct atmel_hlcdc_plane *overlay;
if (dc->layers[i] &&
dc->layers[i]->desc->type == ATMEL_HLCDC_OVERLAY_LAYER) {
overlay = atmel_hlcdc_layer_to_plane(dc->layers[i]);
overlay->base.possible_crtcs = 1 << crtc->id;
}
}
drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);
drm_crtc_vblank_reset(&crtc->base);
dc->crtc = &crtc->base;
return 0;
fail:
atmel_hlcdc_crtc_destroy(&crtc->base);
return ret;
}