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author | Sascha Hauer <s.hauer@pengutronix.de> | 2014-12-14 17:37:51 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2015-07-13 08:38:19 +0200 |
commit | 70007036a5e65247b7e9ccfa1fe6763e8e94d21d (patch) | |
tree | 249186893183d410441dc125ec10d3c794ccc789 /drivers/video | |
parent | c76bfc96384333830d0301fb2e5e4ba557ceaac4 (diff) | |
download | barebox-70007036a5e65247b7e9ccfa1fe6763e8e94d21d.tar.gz barebox-70007036a5e65247b7e9ccfa1fe6763e8e94d21d.tar.xz |
video: Add Video Pipeline (VPL) support
Complex video pipelines are modelled with the of_graph bindings in
the devicetree. This patch adds a ioctl infrastructure to issue
commands to the remote endpoint of a of_graph. Currently defined
ioctls are prepare/unprepare, enable/disable and get_modes. This
is enough to control LVDS or HDMI encoder or simple panels.
A device node which contains of_graph endpoints can be registered
as a VPL entity. An entity can receive ioctls via the .ioctl callback
and also issue ioctls by calling vpl_ioctl. The core itself will never
iterate over the entire pipeline. Instead, the different VPL entities
should forward an ioctl to the next instance in the pipeline whenever
necessary.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/video')
-rw-r--r-- | drivers/video/Kconfig | 3 | ||||
-rw-r--r-- | drivers/video/Makefile | 1 | ||||
-rw-r--r-- | drivers/video/vpl.c | 115 |
3 files changed, 119 insertions, 0 deletions
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 8e6ae99b95..6d540a5368 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -5,6 +5,9 @@ menuconfig VIDEO if VIDEO +config VIDEO_VPL + bool + config DRIVER_VIDEO_ATMEL bool "Atmel LCDC framebuffer driver" depends on ARCH_AT91 diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 76fad5c8e8..3aa544adc8 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -3,6 +3,7 @@ obj-$(CONFIG_DRIVER_VIDEO_EDID) += edid.o obj-$(CONFIG_OFDEVICE) += of_display_timing.o obj-$(CONFIG_DRIVER_VIDEO_BACKLIGHT) += backlight.o obj-$(CONFIG_DRIVER_VIDEO_BACKLIGHT_PWM) += backlight-pwm.o +obj-$(CONFIG_VIDEO_VPL) += vpl.o obj-$(CONFIG_DRIVER_VIDEO_ATMEL) += atmel_lcdfb.o atmel_lcdfb_core.o obj-$(CONFIG_DRIVER_VIDEO_ATMEL_HLCD) += atmel_hlcdfb.o atmel_lcdfb_core.o diff --git a/drivers/video/vpl.c b/drivers/video/vpl.c new file mode 100644 index 0000000000..99ad180eec --- /dev/null +++ b/drivers/video/vpl.c @@ -0,0 +1,115 @@ +/* + * Video pipeline (VPL) support for barebox + * + * (C) Copyright 2014 Sascha Hauer, Pengutronix + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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. + * + */ +#define pr_fmt(fmt) "VPL: " fmt + +#include <common.h> +#include <driver.h> +#include <of_graph.h> +#include <linux/list.h> +#include <video/vpl.h> + +static LIST_HEAD(vpls); + +int vpl_register(struct vpl *vpl) +{ + list_add_tail(&vpl->list, &vpls); + + pr_debug("%s: %s\n", __func__, vpl->node->full_name); + + return 0; +} + +struct vpl *of_find_vpl(struct device_node *node) +{ + struct vpl *vpl; + + list_for_each_entry(vpl, &vpls, list) + if (vpl->node == node) + return vpl; + + return NULL; +} + +struct vpl *of_vpl_get(struct device_node *node, int port) +{ + node = of_graph_get_port_by_id(node, port); + if (!node) + return NULL; + + pr_debug("%s: port: %s\n", __func__, node->full_name); + + node = of_graph_get_remote_port_parent(node); + if (!node) + return NULL; + + pr_debug("%s: remote port parent: %s\n", __func__, node->full_name); + + return of_find_vpl(node); +} + +int vpl_ioctl(struct vpl *vpl, unsigned int port, + unsigned int cmd, void *ptr) +{ + struct device_node *node, *endpoint; + int ret; + + pr_debug("%s: %s port %d\n", __func__, vpl->node->full_name, port); + + node = of_graph_get_port_by_id(vpl->node, port); + if (!node) { + pr_err("%s: no port %d on %s\n", __func__, port, vpl->node->full_name); + return -ENODEV; + } + + for_each_child_of_node(node, endpoint) { + struct device_node *remote, *remote_parent; + struct vpl *remote_vpl; + u32 remote_port_id; + + remote = of_graph_get_remote_port(endpoint); + if (!remote) { + pr_debug("%s: no remote for endpoint %s\n", __func__, endpoint->full_name); + continue; + } + + of_property_read_u32(remote, "reg", &remote_port_id); + + remote_parent = of_graph_get_remote_port_parent(endpoint); + if (!remote_parent) { + pr_debug("%s: no remote_parent\n", __func__); + return -ENODEV; + } + + if (!of_device_is_available(remote_parent)) + continue; + + remote_vpl = of_find_vpl(remote_parent); + if (!remote_vpl) { + pr_debug("%s: cannot find remote vpl %s\n", __func__, remote->full_name); + continue; + } + + ret = remote_vpl->ioctl(remote_vpl, remote_port_id, cmd, ptr); + if (ret) + return ret; + } + + return 0; +} |