// SPDX-License-Identifier: GPL-2.0+
/*
* shmob_drm_crtc.c -- SH Mobile DRM CRTCs
*
* Copyright (C) 2012 Renesas Electronics Corporation
*
* Laurent Pinchart ([email protected])
*/
#include <linux/clk.h>
#include <linux/media-bus-format.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/pm_runtime.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_bridge.h>
#include <drm/drm_bridge_connector.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_dma_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_modeset_helper.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drm_vblank.h>
#include <video/videomode.h>
#include "shmob_drm_crtc.h"
#include "shmob_drm_drv.h"
#include "shmob_drm_kms.h"
#include "shmob_drm_plane.h"
#include "shmob_drm_regs.h"
/* -----------------------------------------------------------------------------
* Page Flip
*/
void shmob_drm_crtc_finish_page_flip(struct shmob_drm_crtc *scrtc)
{
struct drm_pending_vblank_event *event;
struct drm_device *dev = scrtc->base.dev;
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
event = scrtc->event;
scrtc->event = NULL;
if (event) {
drm_crtc_send_vblank_event(&scrtc->base, event);
wake_up(&scrtc->flip_wait);
drm_crtc_vblank_put(&scrtc->base);
}
spin_unlock_irqrestore(&dev->event_lock, flags);
}
static bool shmob_drm_crtc_page_flip_pending(struct shmob_drm_crtc *scrtc)
{
struct drm_device *dev = scrtc->base.dev;
unsigned long flags;
bool pending;
spin_lock_irqsave(&dev->event_lock, flags);
pending = scrtc->event != NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
return pending;
}
static void shmob_drm_crtc_wait_page_flip(struct shmob_drm_crtc *scrtc)
{
struct drm_crtc *crtc = &scrtc->base;
struct shmob_drm_device *sdev = to_shmob_device(crtc->dev);
if (wait_event_timeout(scrtc->flip_wait,
!shmob_drm_crtc_page_flip_pending(scrtc),
msecs_to_jiffies(50)))
return;
dev_warn(sdev->dev, "page flip timeout\n");
shmob_drm_crtc_finish_page_flip(scrtc);
}
/* -----------------------------------------------------------------------------
* CRTC
*/
static const struct {
u32 fmt;
u32 ldmt1r;
} shmob_drm_bus_fmts[] = {
{ MEDIA_BUS_FMT_RGB888_3X8, LDMT1R_MIFTYP_RGB8 },
{ MEDIA_BUS_FMT_RGB666_2X9_BE, LDMT1R_MIFTYP_RGB9 },
{ MEDIA_BUS_FMT_RGB888_2X12_BE, LDMT1R_MIFTYP_RGB12A },
{ MEDIA_BUS_FMT_RGB444_1X12, LDMT1R_MIFTYP_RGB12B },
{ MEDIA_BUS_FMT_RGB565_1X16, LDMT1R_MIFTYP_RGB16 },
{ MEDIA_BUS_FMT_RGB666_1X18, LDMT1R_MIFTYP_RGB18 },
{ MEDIA_BUS_FMT_RGB888_1X24, LDMT1R_MIFTYP_RGB24 },
{ MEDIA_BUS_FMT_UYVY8_1X16, LDMT1R_MIFTYP_YCBCR },
};
static void shmob_drm_crtc_setup_geometry(struct shmob_drm_crtc *scrtc)
{
struct drm_crtc *crtc = &scrtc->base;
struct shmob_drm_device *sdev = to_shmob_device(crtc->dev);
const struct drm_display_info *info = &sdev->connector->display_info;
const struct drm_display_mode *mode = &crtc->mode;
unsigned int i;
u32 value;
if (!info->num_bus_formats || !info->bus_formats) {
dev_warn(sdev->dev, "No bus format reported, using RGB888\n");
value = LDMT1R_MIFTYP_RGB24;
} else {
for (i = 0; i < ARRAY_SIZE(shmob_drm_bus_fmts); i++) {
if (shmob_drm_bus_fmts[i].fmt == info->bus_formats[0])
break;
}
if (i < ARRAY_SIZE(shmob_drm_bus_fmts)) {
value = shmob_drm_bus_fmts[i].ldmt1r;
} else {
dev_warn(sdev->dev,
"unsupported bus format 0x%x, using RGB888\n",
info->bus_formats[0]);
value = LDMT1R_MIFTYP_RGB24;
}
}
if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
value |= LDMT1R_DWPOL;
if (info->bus_flags & DRM_BUS_FLAG_DE_LOW)
value |= LDMT1R_DIPOL;
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
value |= LDMT1R_VPOL;
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
value |= LDMT1R_HPOL;
lcdc_write(sdev, LDMT1R, value);
value = ((mode->hdisplay / 8) << 16) /* HDCN */
| (mode->htotal / 8); /* HTCN */
lcdc_write(sdev, LDHCNR, value);
value = (((mode->hsync_end - mode->hsync_start) / 8) << 16) /* HSYNW */
| (mode->hsync_start / 8); /* HSYNP */
lcdc_write(sdev, LDHSYNR, value);
value = ((mode->hdisplay & 7) << 24) | ((mode->htotal & 7) << 16)
| (((mode->hsync_end - mode->hsync_start) & 7) << 8)
| (mode->hsync_start & 7);
lcdc_write(sdev, LDHAJR, value);
value = ((mode->vdisplay) << 16) /* VDLN */
| mode->vtotal; /* VTLN */
lcdc_write(sdev, LDVLNR, value);
value = ((mode->vsync_end - mode->vsync_start) << 16) /* VSYNW */
| mode->vsync_start; /* VSYNP */
lcdc_write(sdev, LDVSYNR, value);
}
static void shmob_drm_crtc_start_stop(struct shmob_drm_crtc *scrtc, bool start)
{
struct shmob_drm_device *sdev = to_shmob_device(scrtc->base.dev);
u32 value;
value = lcdc_read(sdev, LDCNT2R);
if (start)
lcdc_write(sdev, LDCNT2R, value | LDCNT2R_DO);
else
lcdc_write(sdev, LDCNT2R, value & ~LDCNT2R_DO);
/* Wait until power is applied/stopped. */
while (1) {
value = lcdc_read(sdev, LDPMR) & LDPMR_LPS;
if ((start && value) || (!start && !value))
break;
cpu_relax();
}
if (!start) {
/* Stop the dot clock. */
lcdc_write(sdev, LDDCKSTPR, LDDCKSTPR_DCKSTP);
}
}
static inline struct shmob_drm_crtc *to_shmob_crtc(struct drm_crtc *crtc)
{
return container_of(crtc, struct shmob_drm_crtc, base);
}
static void shmob_drm_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
struct shmob_drm_device *sdev = to_shmob_device(crtc->dev);
unsigned int clk_div = sdev->config.clk_div;
struct device *dev = sdev->dev;
u32 value;
int ret;
ret = pm_runtime_resume_and_get(dev);
if (ret)
return;
/* Reset and enable the LCDC. */
lcdc_write(sdev, LDCNT2R, lcdc_read(sdev, LDCNT2R) | LDCNT2R_BR);
lcdc_wait_bit(sdev, LDCNT2R, LDCNT2R_BR, 0);
lcdc_write(sdev, LDCNT2R, LDCNT2R_ME);
/* Stop the LCDC first and disable all interrupts. */
shmob_drm_crtc_start_stop(scrtc, false);
lcdc_write(sdev, LDINTR, 0);
/* Configure power supply, dot clocks and start them. */
lcdc_write(sdev, LDPMR, 0);
value = sdev->lddckr;
if (clk_div) {
/* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider
* denominator.
*/
lcdc_write(sdev, LDDCKPAT1R, 0);
lcdc_write(sdev, LDDCKPAT2R, (1 << (clk_div / 2)) - 1);
if (clk_div == 1)
value |= LDDCKR_MOSEL;
else
value |= clk_div;
}
lcdc_write(sdev, LDDCKR, value);
lcdc_write(sdev, LDDCKSTPR, 0);
lcdc_wait_bit(sdev, LDDCKSTPR, ~0, 0);
/* Setup geometry, format, frame buffer memory and operation mode. */
shmob_drm_crtc_setup_geometry(scrtc);
lcdc_write(sdev, LDSM1R, 0);
/* Enable the display output. */
lcdc_write(sdev, LDCNT1R, LDCNT1R_DE);
shmob_drm_crtc_start_stop(scrtc, true);
/* Turn vertical blank interrupt reporting back on. */
drm_crtc_vblank_on(crtc);
}
static void shmob_drm_crtc_atomic_disable(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
struct shmob_drm_device *sdev = to_shmob_device(crtc->dev);
/*
* Disable vertical blank interrupt reporting. We first need to wait
* for page flip completion before stopping the CRTC as userspace
* expects page flips to eventually complete.
*/
shmob_drm_crtc_wait_page_flip(scrtc);
drm_crtc_vblank_off(crtc);
/* Stop the LCDC. */
shmob_drm_crtc_start_stop(scrtc, false);
/* Disable the display output. */
lcdc_write(sdev, LDCNT1R, 0);
pm_runtime_put(sdev->dev);
}
static void shmob_drm_crtc_atomic_flush(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
struct drm_pending_vblank_event *event;
struct drm_device *dev = crtc->dev;
unsigned long flags;
if (crtc->state->event) {
spin_lock_irqsave(&dev->event_lock, flags);
event = crtc->state->event;
crtc->state->event = NULL;
drm_crtc_send_vblank_event(crtc, event);
spin_unlock_irqrestore(&dev->event_lock, flags);
}
}
static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
.atomic_flush = shmob_drm_crtc_atomic_flush,
.atomic_enable = shmob_drm_crtc_atomic_enable,
.atomic_disable = shmob_drm_crtc_atomic_disable,
};
static int shmob_drm_crtc_page_flip(struct drm_crtc *crtc,
struct drm_framebuffer *fb,
struct drm_pending_vblank_event *event,
uint32_t page_flip_flags,
struct drm_modeset_acquire_ctx *ctx)
{
struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
struct drm_device *dev = scrtc->base.dev;
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
if (scrtc->event != NULL) {
spin_unlock_irqrestore(&dev->event_lock, flags);
return -EBUSY;
}
spin_unlock_irqrestore(&dev->event_lock, flags);
drm_atomic_set_fb_for_plane(crtc->primary->state, fb);
if (event) {
event->pipe = 0;
drm_crtc_vblank_get(&scrtc->base);
spin_lock_irqsave(&dev->event_lock, flags);
scrtc->event = event;
spin_unlock_irqrestore(&dev->event_lock, flags);
}
return 0;
}
static void shmob_drm_crtc_enable_vblank(struct shmob_drm_device *sdev,
bool enable)
{
unsigned long flags;
u32 ldintr;
/* Be careful not to acknowledge any pending interrupt. */
spin_lock_irqsave(&sdev->irq_lock, flags);
ldintr = lcdc_read(sdev, LDINTR) | LDINTR_STATUS_MASK;
if (enable)
ldintr |= LDINTR_VEE;
else
ldintr &= ~LDINTR_VEE;
lcdc_write(sdev, LDINTR, ldintr);
spin_unlock_irqrestore(&sdev->irq_lock, flags);
}
static int shmob_drm_enable_vblank(struct drm_crtc *crtc)
{
struct shmob_drm_device *sdev = to_shmob_device(crtc->dev);
shmob_drm_crtc_enable_vblank(sdev, true);
return 0;
}
static void shmob_drm_disable_vblank(struct drm_crtc *crtc)
{
struct shmob_drm_device *sdev = to_shmob_device(crtc->dev);
shmob_drm_crtc_enable_vblank(sdev, false);
}
static const struct drm_crtc_funcs crtc_funcs = {
.reset = drm_atomic_helper_crtc_reset,
.destroy = drm_crtc_cleanup,
.set_config = drm_atomic_helper_set_config,
.page_flip = shmob_drm_crtc_page_flip,
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
.enable_vblank = shmob_drm_enable_vblank,
.disable_vblank = shmob_drm_disable_vblank,
};
int shmob_drm_crtc_create(struct shmob_drm_device *sdev)
{
struct drm_crtc *crtc = &sdev->crtc.base;
struct drm_plane *primary, *plane;
unsigned int i;
int ret;
init_waitqueue_head(&sdev->crtc.flip_wait);
primary = shmob_drm_plane_create(sdev, DRM_PLANE_TYPE_PRIMARY, 0);
if (IS_ERR(primary))
return PTR_ERR(primary);
for (i = 1; i < 5; ++i) {
plane = shmob_drm_plane_create(sdev, DRM_PLANE_TYPE_OVERLAY, i);
if (IS_ERR(plane))
return PTR_ERR(plane);
}
ret = drm_crtc_init_with_planes(&sdev->ddev, crtc, primary, NULL,
&crtc_funcs, NULL);
if (ret < 0)
return ret;
drm_crtc_helper_add(crtc, &crtc_helper_funcs);
/* Start with vertical blank interrupt reporting disabled. */
drm_crtc_vblank_off(crtc);
return 0;
}
/* -----------------------------------------------------------------------------
* Legacy Encoder
*/
static bool shmob_drm_encoder_mode_fixup(struct drm_encoder *encoder,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct drm_device *dev = encoder->dev;
struct shmob_drm_device *sdev = to_shmob_device(dev);
struct drm_connector *connector = sdev->connector;
const struct drm_display_mode *panel_mode;
if (list_empty(&connector->modes)) {
dev_dbg(dev->dev, "mode_fixup: empty modes list\n");
return false;
}
/* The flat panel mode is fixed, just copy it to the adjusted mode. */
panel_mode = list_first_entry(&connector->modes,
struct drm_display_mode, head);
drm_mode_copy(adjusted_mode, panel_mode);
return true;
}
static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
.mode_fixup = shmob_drm_encoder_mode_fixup,
};
/* -----------------------------------------------------------------------------
* Encoder
*/
int shmob_drm_encoder_create(struct shmob_drm_device *sdev)
{
struct drm_encoder *encoder = &sdev->encoder;
struct drm_bridge *bridge;
int ret;
encoder->possible_crtcs = 1;
ret = drm_simple_encoder_init(&sdev->ddev, encoder,
DRM_MODE_ENCODER_DPI);
if (ret < 0)
return ret;
if (sdev->pdata) {
drm_encoder_helper_add(encoder, &encoder_helper_funcs);
return 0;
}
/* Create a panel bridge */
bridge = devm_drm_of_get_bridge(sdev->dev, sdev->dev->of_node, 0, 0);
if (IS_ERR(bridge))
return PTR_ERR(bridge);
/* Attach the bridge to the encoder */
ret = drm_bridge_attach(encoder, bridge, NULL,
DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (ret) {
dev_err(sdev->dev, "failed to attach bridge: %pe\n",
ERR_PTR(ret));
return ret;
}
return 0;
}
/* -----------------------------------------------------------------------------
* Legacy Connector
*/
static inline struct shmob_drm_connector *to_shmob_connector(struct drm_connector *connector)
{
return container_of(connector, struct shmob_drm_connector, base);
}
static int shmob_drm_connector_get_modes(struct drm_connector *connector)
{
struct shmob_drm_connector *scon = to_shmob_connector(connector);
struct drm_display_mode *mode;
mode = drm_mode_create(connector->dev);
if (mode == NULL)
return 0;
mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
drm_display_mode_from_videomode(scon->mode, mode);
drm_mode_probed_add(connector, mode);
return 1;
}
static struct drm_encoder *
shmob_drm_connector_best_encoder(struct drm_connector *connector)
{
struct shmob_drm_connector *scon = to_shmob_connector(connector);
return scon->encoder;
}
static const struct drm_connector_helper_funcs connector_helper_funcs = {
.get_modes = shmob_drm_connector_get_modes,
.best_encoder = shmob_drm_connector_best_encoder,
};
static void shmob_drm_connector_destroy(struct drm_connector *connector)
{
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
static const struct drm_connector_funcs connector_funcs = {
.reset = drm_atomic_helper_connector_reset,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = shmob_drm_connector_destroy,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static struct drm_connector *
shmob_drm_connector_init(struct shmob_drm_device *sdev,
struct drm_encoder *encoder)
{
u32 bus_fmt = sdev->pdata->iface.bus_fmt;
struct shmob_drm_connector *scon;
struct drm_connector *connector;
struct drm_display_info *info;
unsigned int i;
int ret;
for (i = 0; i < ARRAY_SIZE(shmob_drm_bus_fmts); i++) {
if (shmob_drm_bus_fmts[i].fmt == bus_fmt)
break;
}
if (i == ARRAY_SIZE(shmob_drm_bus_fmts)) {
dev_err(sdev->dev, "unsupported bus format 0x%x\n", bus_fmt);
return ERR_PTR(-EINVAL);
}
scon = kzalloc(sizeof(*scon), GFP_KERNEL);
if (!scon)
return ERR_PTR(-ENOMEM);
connector = &scon->base;
scon->encoder = encoder;
scon->mode = &sdev->pdata->panel.mode;
info = &connector->display_info;
info->width_mm = sdev->pdata->panel.width_mm;
info->height_mm = sdev->pdata->panel.height_mm;
if (scon->mode->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
if (scon->mode->flags & DISPLAY_FLAGS_DE_LOW)
info->bus_flags |= DRM_BUS_FLAG_DE_LOW;
ret = drm_display_info_set_bus_formats(info, &bus_fmt, 1);
if (ret < 0) {
kfree(scon);
return ERR_PTR(ret);
}
ret = drm_connector_init(&sdev->ddev, connector, &connector_funcs,
DRM_MODE_CONNECTOR_DPI);
if (ret < 0) {
kfree(scon);
return ERR_PTR(ret);
}
drm_connector_helper_add(connector, &connector_helper_funcs);
return connector;
}
/* -----------------------------------------------------------------------------
* Connector
*/
int shmob_drm_connector_create(struct shmob_drm_device *sdev,
struct drm_encoder *encoder)
{
struct drm_connector *connector;
int ret;
if (sdev->pdata)
connector = shmob_drm_connector_init(sdev, encoder);
else
connector = drm_bridge_connector_init(&sdev->ddev, encoder);
if (IS_ERR(connector)) {
dev_err(sdev->dev, "failed to created connector: %pe\n",
connector);
return PTR_ERR(connector);
}
ret = drm_connector_attach_encoder(connector, encoder);
if (ret < 0)
goto error;
connector->dpms = DRM_MODE_DPMS_OFF;
sdev->connector = connector;
return 0;
error:
drm_connector_cleanup(connector);
return ret;
}
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