[U-Boot] [PATCH v6 20/26] dm: video: Add a uclass for display port

Simon Glass
2015-04-15T03:03:38Z

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>
---

Changes in v6: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

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 51728b3..62af63a 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 22a316b..2846ac8 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 0000000..17f5de9
--- /dev/null
+++ b/drivers/video/dp-uclass.c
@@ -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",
+};
diff --git a/include/displayport.h b/include/displayport.h
new file mode 100644
index 0000000..f7c7e25
--- /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 ddcd9c6..b83098c 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -26,6 +26,7 @@ enum uclass_id {

/* U-Boot uclasses start here - in alphabetical order */
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 */
--
2.2.0.rc0.207.ga3a616c