mirror of https://gitee.com/openkylin/linux.git
512 lines
13 KiB
C
512 lines
13 KiB
C
/*
|
|
* Copyright (C) 2016 Broadcom Limited
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
/**
|
|
* DOC: VC4 DPI module
|
|
*
|
|
* The VC4 DPI hardware supports MIPI DPI type 4 and Nokia ViSSI
|
|
* signals, which are routed out to GPIO0-27 with the ALT2 function.
|
|
*/
|
|
|
|
#include "drm_atomic_helper.h"
|
|
#include "drm_crtc_helper.h"
|
|
#include "drm_edid.h"
|
|
#include "drm_panel.h"
|
|
#include "linux/clk.h"
|
|
#include "linux/component.h"
|
|
#include "linux/of_graph.h"
|
|
#include "linux/of_platform.h"
|
|
#include "vc4_drv.h"
|
|
#include "vc4_regs.h"
|
|
|
|
#define DPI_C 0x00
|
|
# define DPI_OUTPUT_ENABLE_MODE BIT(16)
|
|
|
|
/* The order field takes the incoming 24 bit RGB from the pixel valve
|
|
* and shuffles the 3 channels.
|
|
*/
|
|
# define DPI_ORDER_MASK VC4_MASK(15, 14)
|
|
# define DPI_ORDER_SHIFT 14
|
|
# define DPI_ORDER_RGB 0
|
|
# define DPI_ORDER_BGR 1
|
|
# define DPI_ORDER_GRB 2
|
|
# define DPI_ORDER_BRG 3
|
|
|
|
/* The format field takes the ORDER-shuffled pixel valve data and
|
|
* formats it onto the output lines.
|
|
*/
|
|
# define DPI_FORMAT_MASK VC4_MASK(13, 11)
|
|
# define DPI_FORMAT_SHIFT 11
|
|
/* This define is named in the hardware, but actually just outputs 0. */
|
|
# define DPI_FORMAT_9BIT_666_RGB 0
|
|
/* Outputs 00000000rrrrrggggggbbbbb */
|
|
# define DPI_FORMAT_16BIT_565_RGB_1 1
|
|
/* Outputs 000rrrrr00gggggg000bbbbb */
|
|
# define DPI_FORMAT_16BIT_565_RGB_2 2
|
|
/* Outputs 00rrrrr000gggggg00bbbbb0 */
|
|
# define DPI_FORMAT_16BIT_565_RGB_3 3
|
|
/* Outputs 000000rrrrrrggggggbbbbbb */
|
|
# define DPI_FORMAT_18BIT_666_RGB_1 4
|
|
/* Outputs 00rrrrrr00gggggg00bbbbbb */
|
|
# define DPI_FORMAT_18BIT_666_RGB_2 5
|
|
/* Outputs rrrrrrrrggggggggbbbbbbbb */
|
|
# define DPI_FORMAT_24BIT_888_RGB 6
|
|
|
|
/* Reverses the polarity of the corresponding signal */
|
|
# define DPI_PIXEL_CLK_INVERT BIT(10)
|
|
# define DPI_HSYNC_INVERT BIT(9)
|
|
# define DPI_VSYNC_INVERT BIT(8)
|
|
# define DPI_OUTPUT_ENABLE_INVERT BIT(7)
|
|
|
|
/* Outputs the signal the falling clock edge instead of rising. */
|
|
# define DPI_HSYNC_NEGATE BIT(6)
|
|
# define DPI_VSYNC_NEGATE BIT(5)
|
|
# define DPI_OUTPUT_ENABLE_NEGATE BIT(4)
|
|
|
|
/* Disables the signal */
|
|
# define DPI_HSYNC_DISABLE BIT(3)
|
|
# define DPI_VSYNC_DISABLE BIT(2)
|
|
# define DPI_OUTPUT_ENABLE_DISABLE BIT(1)
|
|
|
|
/* Power gate to the device, full reset at 0 -> 1 transition */
|
|
# define DPI_ENABLE BIT(0)
|
|
|
|
/* All other registers besides DPI_C return the ID */
|
|
#define DPI_ID 0x04
|
|
# define DPI_ID_VALUE 0x00647069
|
|
|
|
/* General DPI hardware state. */
|
|
struct vc4_dpi {
|
|
struct platform_device *pdev;
|
|
|
|
struct drm_encoder *encoder;
|
|
struct drm_connector *connector;
|
|
struct drm_panel *panel;
|
|
|
|
void __iomem *regs;
|
|
|
|
struct clk *pixel_clock;
|
|
struct clk *core_clock;
|
|
};
|
|
|
|
#define DPI_READ(offset) readl(dpi->regs + (offset))
|
|
#define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset))
|
|
|
|
/* VC4 DPI encoder KMS struct */
|
|
struct vc4_dpi_encoder {
|
|
struct vc4_encoder base;
|
|
struct vc4_dpi *dpi;
|
|
};
|
|
|
|
static inline struct vc4_dpi_encoder *
|
|
to_vc4_dpi_encoder(struct drm_encoder *encoder)
|
|
{
|
|
return container_of(encoder, struct vc4_dpi_encoder, base.base);
|
|
}
|
|
|
|
/* VC4 DPI connector KMS struct */
|
|
struct vc4_dpi_connector {
|
|
struct drm_connector base;
|
|
struct vc4_dpi *dpi;
|
|
|
|
/* Since the connector is attached to just the one encoder,
|
|
* this is the reference to it so we can do the best_encoder()
|
|
* hook.
|
|
*/
|
|
struct drm_encoder *encoder;
|
|
};
|
|
|
|
static inline struct vc4_dpi_connector *
|
|
to_vc4_dpi_connector(struct drm_connector *connector)
|
|
{
|
|
return container_of(connector, struct vc4_dpi_connector, base);
|
|
}
|
|
|
|
#define DPI_REG(reg) { reg, #reg }
|
|
static const struct {
|
|
u32 reg;
|
|
const char *name;
|
|
} dpi_regs[] = {
|
|
DPI_REG(DPI_C),
|
|
DPI_REG(DPI_ID),
|
|
};
|
|
|
|
static void vc4_dpi_dump_regs(struct vc4_dpi *dpi)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) {
|
|
DRM_INFO("0x%04x (%s): 0x%08x\n",
|
|
dpi_regs[i].reg, dpi_regs[i].name,
|
|
DPI_READ(dpi_regs[i].reg));
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
int vc4_dpi_debugfs_regs(struct seq_file *m, void *unused)
|
|
{
|
|
struct drm_info_node *node = (struct drm_info_node *)m->private;
|
|
struct drm_device *dev = node->minor->dev;
|
|
struct vc4_dev *vc4 = to_vc4_dev(dev);
|
|
struct vc4_dpi *dpi = vc4->dpi;
|
|
int i;
|
|
|
|
if (!dpi)
|
|
return 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) {
|
|
seq_printf(m, "%s (0x%04x): 0x%08x\n",
|
|
dpi_regs[i].name, dpi_regs[i].reg,
|
|
DPI_READ(dpi_regs[i].reg));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static enum drm_connector_status
|
|
vc4_dpi_connector_detect(struct drm_connector *connector, bool force)
|
|
{
|
|
struct vc4_dpi_connector *vc4_connector =
|
|
to_vc4_dpi_connector(connector);
|
|
struct vc4_dpi *dpi = vc4_connector->dpi;
|
|
|
|
if (dpi->panel)
|
|
return connector_status_connected;
|
|
else
|
|
return connector_status_disconnected;
|
|
}
|
|
|
|
static void vc4_dpi_connector_destroy(struct drm_connector *connector)
|
|
{
|
|
drm_connector_unregister(connector);
|
|
drm_connector_cleanup(connector);
|
|
}
|
|
|
|
static int vc4_dpi_connector_get_modes(struct drm_connector *connector)
|
|
{
|
|
struct vc4_dpi_connector *vc4_connector =
|
|
to_vc4_dpi_connector(connector);
|
|
struct vc4_dpi *dpi = vc4_connector->dpi;
|
|
|
|
if (dpi->panel)
|
|
return drm_panel_get_modes(dpi->panel);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct drm_connector_funcs vc4_dpi_connector_funcs = {
|
|
.dpms = drm_atomic_helper_connector_dpms,
|
|
.detect = vc4_dpi_connector_detect,
|
|
.fill_modes = drm_helper_probe_single_connector_modes,
|
|
.destroy = vc4_dpi_connector_destroy,
|
|
.reset = drm_atomic_helper_connector_reset,
|
|
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
|
|
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
|
|
};
|
|
|
|
static const struct drm_connector_helper_funcs vc4_dpi_connector_helper_funcs = {
|
|
.get_modes = vc4_dpi_connector_get_modes,
|
|
};
|
|
|
|
static struct drm_connector *vc4_dpi_connector_init(struct drm_device *dev,
|
|
struct vc4_dpi *dpi)
|
|
{
|
|
struct drm_connector *connector = NULL;
|
|
struct vc4_dpi_connector *dpi_connector;
|
|
int ret = 0;
|
|
|
|
dpi_connector = devm_kzalloc(dev->dev, sizeof(*dpi_connector),
|
|
GFP_KERNEL);
|
|
if (!dpi_connector) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
connector = &dpi_connector->base;
|
|
|
|
dpi_connector->encoder = dpi->encoder;
|
|
dpi_connector->dpi = dpi;
|
|
|
|
drm_connector_init(dev, connector, &vc4_dpi_connector_funcs,
|
|
DRM_MODE_CONNECTOR_DPI);
|
|
drm_connector_helper_add(connector, &vc4_dpi_connector_helper_funcs);
|
|
|
|
connector->polled = 0;
|
|
connector->interlace_allowed = 0;
|
|
connector->doublescan_allowed = 0;
|
|
|
|
drm_mode_connector_attach_encoder(connector, dpi->encoder);
|
|
|
|
return connector;
|
|
|
|
fail:
|
|
if (connector)
|
|
vc4_dpi_connector_destroy(connector);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = {
|
|
.destroy = drm_encoder_cleanup,
|
|
};
|
|
|
|
static void vc4_dpi_encoder_disable(struct drm_encoder *encoder)
|
|
{
|
|
struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
|
|
struct vc4_dpi *dpi = vc4_encoder->dpi;
|
|
|
|
drm_panel_disable(dpi->panel);
|
|
|
|
clk_disable_unprepare(dpi->pixel_clock);
|
|
|
|
drm_panel_unprepare(dpi->panel);
|
|
}
|
|
|
|
static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
|
|
{
|
|
struct drm_display_mode *mode = &encoder->crtc->mode;
|
|
struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
|
|
struct vc4_dpi *dpi = vc4_encoder->dpi;
|
|
u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE;
|
|
int ret;
|
|
|
|
ret = drm_panel_prepare(dpi->panel);
|
|
if (ret) {
|
|
DRM_ERROR("Panel failed to prepare\n");
|
|
return;
|
|
}
|
|
|
|
if (dpi->connector->display_info.num_bus_formats) {
|
|
u32 bus_format = dpi->connector->display_info.bus_formats[0];
|
|
|
|
switch (bus_format) {
|
|
case MEDIA_BUS_FMT_RGB888_1X24:
|
|
dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
|
|
DPI_FORMAT);
|
|
break;
|
|
case MEDIA_BUS_FMT_BGR888_1X24:
|
|
dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
|
|
DPI_FORMAT);
|
|
dpi_c |= VC4_SET_FIELD(DPI_ORDER_BGR, DPI_ORDER);
|
|
break;
|
|
case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
|
|
dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_2,
|
|
DPI_FORMAT);
|
|
break;
|
|
case MEDIA_BUS_FMT_RGB666_1X18:
|
|
dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1,
|
|
DPI_FORMAT);
|
|
break;
|
|
case MEDIA_BUS_FMT_RGB565_1X16:
|
|
dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3,
|
|
DPI_FORMAT);
|
|
break;
|
|
default:
|
|
DRM_ERROR("Unknown media bus format %d\n", bus_format);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
|
|
dpi_c |= DPI_HSYNC_INVERT;
|
|
else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
|
|
dpi_c |= DPI_HSYNC_DISABLE;
|
|
|
|
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
|
|
dpi_c |= DPI_VSYNC_INVERT;
|
|
else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
|
|
dpi_c |= DPI_VSYNC_DISABLE;
|
|
|
|
DPI_WRITE(DPI_C, dpi_c);
|
|
|
|
ret = clk_set_rate(dpi->pixel_clock, mode->clock * 1000);
|
|
if (ret)
|
|
DRM_ERROR("Failed to set clock rate: %d\n", ret);
|
|
|
|
ret = clk_prepare_enable(dpi->pixel_clock);
|
|
if (ret)
|
|
DRM_ERROR("Failed to set clock rate: %d\n", ret);
|
|
|
|
ret = drm_panel_enable(dpi->panel);
|
|
if (ret) {
|
|
DRM_ERROR("Panel failed to enable\n");
|
|
drm_panel_unprepare(dpi->panel);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = {
|
|
.disable = vc4_dpi_encoder_disable,
|
|
.enable = vc4_dpi_encoder_enable,
|
|
};
|
|
|
|
static const struct of_device_id vc4_dpi_dt_match[] = {
|
|
{ .compatible = "brcm,bcm2835-dpi", .data = NULL },
|
|
{}
|
|
};
|
|
|
|
/* Walks the OF graph to find the panel node and then asks DRM to look
|
|
* up the panel.
|
|
*/
|
|
static struct drm_panel *vc4_dpi_get_panel(struct device *dev)
|
|
{
|
|
struct device_node *endpoint, *panel_node;
|
|
struct device_node *np = dev->of_node;
|
|
struct drm_panel *panel;
|
|
|
|
endpoint = of_graph_get_next_endpoint(np, NULL);
|
|
if (!endpoint) {
|
|
dev_err(dev, "no endpoint to fetch DPI panel\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* don't proceed if we have an endpoint but no panel_node tied to it */
|
|
panel_node = of_graph_get_remote_port_parent(endpoint);
|
|
of_node_put(endpoint);
|
|
if (!panel_node) {
|
|
dev_err(dev, "no valid panel node\n");
|
|
return NULL;
|
|
}
|
|
|
|
panel = of_drm_find_panel(panel_node);
|
|
of_node_put(panel_node);
|
|
|
|
return panel;
|
|
}
|
|
|
|
static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct drm_device *drm = dev_get_drvdata(master);
|
|
struct vc4_dev *vc4 = to_vc4_dev(drm);
|
|
struct vc4_dpi *dpi;
|
|
struct vc4_dpi_encoder *vc4_dpi_encoder;
|
|
int ret;
|
|
|
|
dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
|
|
if (!dpi)
|
|
return -ENOMEM;
|
|
|
|
vc4_dpi_encoder = devm_kzalloc(dev, sizeof(*vc4_dpi_encoder),
|
|
GFP_KERNEL);
|
|
if (!vc4_dpi_encoder)
|
|
return -ENOMEM;
|
|
vc4_dpi_encoder->base.type = VC4_ENCODER_TYPE_DPI;
|
|
vc4_dpi_encoder->dpi = dpi;
|
|
dpi->encoder = &vc4_dpi_encoder->base.base;
|
|
|
|
dpi->pdev = pdev;
|
|
dpi->regs = vc4_ioremap_regs(pdev, 0);
|
|
if (IS_ERR(dpi->regs))
|
|
return PTR_ERR(dpi->regs);
|
|
|
|
vc4_dpi_dump_regs(dpi);
|
|
|
|
if (DPI_READ(DPI_ID) != DPI_ID_VALUE) {
|
|
dev_err(dev, "Port returned 0x%08x for ID instead of 0x%08x\n",
|
|
DPI_READ(DPI_ID), DPI_ID_VALUE);
|
|
return -ENODEV;
|
|
}
|
|
|
|
dpi->core_clock = devm_clk_get(dev, "core");
|
|
if (IS_ERR(dpi->core_clock)) {
|
|
ret = PTR_ERR(dpi->core_clock);
|
|
if (ret != -EPROBE_DEFER)
|
|
DRM_ERROR("Failed to get core clock: %d\n", ret);
|
|
return ret;
|
|
}
|
|
dpi->pixel_clock = devm_clk_get(dev, "pixel");
|
|
if (IS_ERR(dpi->pixel_clock)) {
|
|
ret = PTR_ERR(dpi->pixel_clock);
|
|
if (ret != -EPROBE_DEFER)
|
|
DRM_ERROR("Failed to get pixel clock: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = clk_prepare_enable(dpi->core_clock);
|
|
if (ret)
|
|
DRM_ERROR("Failed to turn on core clock: %d\n", ret);
|
|
|
|
dpi->panel = vc4_dpi_get_panel(dev);
|
|
|
|
drm_encoder_init(drm, dpi->encoder, &vc4_dpi_encoder_funcs,
|
|
DRM_MODE_ENCODER_DPI, NULL);
|
|
drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs);
|
|
|
|
dpi->connector = vc4_dpi_connector_init(drm, dpi);
|
|
if (IS_ERR(dpi->connector)) {
|
|
ret = PTR_ERR(dpi->connector);
|
|
goto err_destroy_encoder;
|
|
}
|
|
|
|
if (dpi->panel)
|
|
drm_panel_attach(dpi->panel, dpi->connector);
|
|
|
|
dev_set_drvdata(dev, dpi);
|
|
|
|
vc4->dpi = dpi;
|
|
|
|
return 0;
|
|
|
|
err_destroy_encoder:
|
|
drm_encoder_cleanup(dpi->encoder);
|
|
clk_disable_unprepare(dpi->core_clock);
|
|
return ret;
|
|
}
|
|
|
|
static void vc4_dpi_unbind(struct device *dev, struct device *master,
|
|
void *data)
|
|
{
|
|
struct drm_device *drm = dev_get_drvdata(master);
|
|
struct vc4_dev *vc4 = to_vc4_dev(drm);
|
|
struct vc4_dpi *dpi = dev_get_drvdata(dev);
|
|
|
|
if (dpi->panel)
|
|
drm_panel_detach(dpi->panel);
|
|
|
|
vc4_dpi_connector_destroy(dpi->connector);
|
|
drm_encoder_cleanup(dpi->encoder);
|
|
|
|
clk_disable_unprepare(dpi->core_clock);
|
|
|
|
vc4->dpi = NULL;
|
|
}
|
|
|
|
static const struct component_ops vc4_dpi_ops = {
|
|
.bind = vc4_dpi_bind,
|
|
.unbind = vc4_dpi_unbind,
|
|
};
|
|
|
|
static int vc4_dpi_dev_probe(struct platform_device *pdev)
|
|
{
|
|
return component_add(&pdev->dev, &vc4_dpi_ops);
|
|
}
|
|
|
|
static int vc4_dpi_dev_remove(struct platform_device *pdev)
|
|
{
|
|
component_del(&pdev->dev, &vc4_dpi_ops);
|
|
return 0;
|
|
}
|
|
|
|
struct platform_driver vc4_dpi_driver = {
|
|
.probe = vc4_dpi_dev_probe,
|
|
.remove = vc4_dpi_dev_remove,
|
|
.driver = {
|
|
.name = "vc4_dpi",
|
|
.of_match_table = vc4_dpi_dt_match,
|
|
},
|
|
};
|