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31fe2c2002
linux/drivers/gpu/drm/vc4/vc4_dpi.c
Eric Anholt 7b1298e053 drm/vc4: Switch DPI to using the panel-bridge helper. 
Another 100 lines of boilerplate gone, while allowing for bridges to
be connected in the display chain.

Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170511183128.25085-3-eric@anholt.net
2017-06-05 15:21:26 +05:30

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/*
* 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/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/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_bridge *bridge;
bool is_panel_bridge;
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);
}
#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 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;
clk_disable_unprepare(dpi->pixel_clock);
}
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;
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);
}
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 },
{}
};
/* Sets up the next link in the display chain, whether it's a panel or
* a bridge.
*/
static int vc4_dpi_init_bridge(struct vc4_dpi *dpi)
{
struct device *dev = &dpi->pdev->dev;
struct drm_panel *panel;
int ret;
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
&panel, &dpi->bridge);
if (ret) {
/* If nothing was connected in the DT, that's not an
* error.
*/
if (ret == -ENODEV)
return 0;
else
return ret;
}
if (panel) {
dpi->bridge = drm_panel_bridge_add(panel,
DRM_MODE_CONNECTOR_DPI);
dpi->is_panel_bridge = true;
}
return drm_bridge_attach(dpi->encoder, dpi->bridge, NULL);
}
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);
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);
ret = vc4_dpi_init_bridge(dpi);
if (ret)
goto err_destroy_encoder;
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->is_panel_bridge)
drm_panel_bridge_remove(dpi->bridge);
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,
},
};
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