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>

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 51728b366f007529c2335dd929becaa30b3fcfd4..62af63a5845294c782f5646a163a6e548da408a6 100644 (file)
--- 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 f64918e6bae41dbaead0d688fd81a1156fb31b60..2945710d01be1f010a4fdf984d7f78a7d3dccae9 100644 (file)
--- 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 (file)
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 (file)
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 b17528d207cdbf3f8d90b0a4dfaf7017bd6e9567..095bcb22b93e32ef16bf1de211f63b3a87b15bef 100644 (file)
--- 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 */