linux-stable/drivers/gpu/drm/vc4/vc4_dpi.c
Rob Herring 86418f90a4 drm: convert drivers to use of_graph_get_remote_node
Convert drivers to use the new of_graph_get_remote_node() helper
instead of parsing the endpoint node and then getting the remote device
node. Now drivers can just specify the device node and which
port/endpoint and get back the connected remote device node. The details
of the graph binding are nicely abstracted into the core OF graph code.

This changes some error messages to debug messages (in the graph core).
Graph connections are often "no connects" depending on the particular
board, so we want to avoid spurious messages. Plus the kernel is not a
DT validator.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Liviu Dudau <liviu.dudau@arm.com>
Tested-by: Eric Anholt <eric@anholt.net>
Tested-by: Jyri Sarha <jsarha@ti.com>
Tested by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
2017-04-06 17:00:27 -04:00

493 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. On BCM2835, these can be 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),
};
#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;
dpi_connector = devm_kzalloc(dev->dev, sizeof(*dpi_connector),
GFP_KERNEL);
if (!dpi_connector)
return ERR_PTR(-ENOMEM);
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;
}
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 bool vc4_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
return false;
return true;
}
static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = {
.disable = vc4_dpi_encoder_disable,
.enable = vc4_dpi_encoder_enable,
.mode_fixup = vc4_dpi_encoder_mode_fixup,
};
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 *panel_node;
struct device_node *np = dev->of_node;
struct drm_panel *panel;
/* don't proceed if we have an endpoint but no panel_node tied to it */
panel_node = of_graph_get_remote_node(np, 0, 0);
if (!panel_node)
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);
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,
},
};