From 51f2c99e14b28b65b7f66a5cd392fa49c03537aa Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 14 Apr 2015 21:03:38 -0600 Subject: [PATCH] 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 Acked-by: Anatolij Gustschin Signed-off-by: Tom Warren --- drivers/video/Kconfig | 7 +++++ drivers/video/Makefile | 4 +++ drivers/video/dp-uclass.c | 34 ++++++++++++++++++++++ include/displayport.h | 60 +++++++++++++++++++++++++++++++++++++++ include/dm/uclass-id.h | 1 + 5 files changed, 106 insertions(+) create mode 100644 drivers/video/dp-uclass.c create mode 100644 include/displayport.h diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 51728b366f..62af63a584 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -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. diff --git a/drivers/video/Makefile b/drivers/video/Makefile index f64918e6ba..2945710d01 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -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 diff --git a/drivers/video/dp-uclass.c b/drivers/video/dp-uclass.c new file mode 100644 index 0000000000..17f5de96ba --- /dev/null +++ b/drivers/video/dp-uclass.c @@ -0,0 +1,34 @@ +/* + * Copyright 2014 Google Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include + +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", +}; diff --git a/include/displayport.h b/include/displayport.h new file mode 100644 index 0000000000..f7c7e25285 --- /dev/null +++ b/include/displayport.h @@ -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 diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index b17528d207..095bcb22b9 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -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 */ -- 2.25.1