dm: video: Add a uclass for display port

eDP (Embedded DisplayPort) is a standard widely used in laptops to drive
LCD panels. Add a uclass for this which supports a few simple operations.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Simon Glass 2015-04-14 21:03:38 -06:00 committed by Tom Warren
parent 00cf1167bb
commit 51f2c99e14
5 changed files with 106 additions and 0 deletions

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@ -88,3 +88,10 @@ config VIDEO_LCD_SPI_MISO
hardware and LCD panel id retrieval (if the panel can report it). The
option takes a string in the format understood by 'name_to_gpio'
function, e.g. PH1 for pin 1 of port H.
config DISPLAY_PORT
bool "Enable DisplayPort support"
help
eDP (Embedded DisplayPort) is a standard widely used in laptops
to drive LCD panels. This framework provides support for enabling
these displays where supported by the video hardware.

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@ -5,6 +5,10 @@
# SPDX-License-Identifier: GPL-2.0+
#
ifdef CONFIG_DM
obj-$(CONFIG_DISPLAY_PORT) += dp-uclass.o
endif
obj-$(CONFIG_ATI_RADEON_FB) += ati_radeon_fb.o videomodes.o
obj-$(CONFIG_ATMEL_HLCD) += atmel_hlcdfb.o
obj-$(CONFIG_ATMEL_LCD) += atmel_lcdfb.o

34
drivers/video/dp-uclass.c Normal file
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@ -0,0 +1,34 @@
/*
* Copyright 2014 Google Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <displayport.h>
#include <errno.h>
int display_port_read_edid(struct udevice *dev, u8 *buf, int buf_size)
{
struct dm_display_port_ops *ops = display_port_get_ops(dev);
if (!ops || !ops->read_edid)
return -ENOSYS;
return ops->read_edid(dev, buf, buf_size);
}
int display_port_enable(struct udevice *dev, int panel_bpp,
const struct display_timing *timing)
{
struct dm_display_port_ops *ops = display_port_get_ops(dev);
if (!ops || !ops->enable)
return -ENOSYS;
return ops->enable(dev, panel_bpp, timing);
}
UCLASS_DRIVER(display_port) = {
.id = UCLASS_DISPLAY_PORT,
.name = "display_port",
};

60
include/displayport.h Normal file
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@ -0,0 +1,60 @@
/*
* Copyright 2014 Google Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _DISPLAYPORT_H
#define _DISPLAYPORT_H
struct udevice;
struct display_timing;
/**
* display_port_read_edid() - Read information from EDID
*
* @dev: Device to read from
* @buf: Buffer to read into (should be EDID_SIZE bytes)
* @buf_size: Buffer size (should be EDID_SIZE)
* @return number of bytes read, <=0 for error
*/
int display_port_read_edid(struct udevice *dev, u8 *buf, int buf_size);
/**
* display_port_enable() - Enable a display port device
*
* @dev: Device to enable
* @panel_bpp: Number of bits per pixel for panel
* @timing: Display timings
* @return 0 if OK, -ve on error
*/
int display_port_enable(struct udevice *dev, int panel_bpp,
const struct display_timing *timing);
struct dm_display_port_ops {
/**
* read_edid() - Read information from EDID
*
* @dev: Device to read from
* @buf: Buffer to read into (should be EDID_SIZE bytes)
* @buf_size: Buffer size (should be EDID_SIZE)
* @return number of bytes read, <=0 for error
*/
int (*read_edid)(struct udevice *dev, u8 *buf, int buf_size);
/**
* enable() - Enable the display port device
*
* @dev: Device to enable
* @panel_bpp: Number of bits per pixel for panel
* @timing: Display timings
* @return 0 if OK, -ve on error
*/
int (*enable)(struct udevice *dev, int panel_bpp,
const struct display_timing *timing);
};
#define display_port_get_ops(dev) \
((struct dm_display_port_ops *)(dev)->driver->ops)
#endif

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@ -27,6 +27,7 @@ enum uclass_id {
/* U-Boot uclasses start here - in alphabetical order */
UCLASS_CPU, /* CPU, typically part of an SoC */
UCLASS_CROS_EC, /* Chrome OS EC */
UCLASS_DISPLAY_PORT, /* Display port video */
UCLASS_ETH, /* Ethernet device */
UCLASS_GPIO, /* Bank of general-purpose I/O pins */
UCLASS_I2C, /* I2C bus */