mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 08:01:59 +00:00
2938931f37
Many panel data sheets, additionally to typical values, list allowed ranges for timings such as hsync/vsync lengths, porches, and the pixel clock rate. These can be stored in a struct display_timing, to be used by an encoder mode_fixup callback to clamp user provided timing values or to validate workarounds for clock source limitations. This patch adds a new drm_panel_funcs callback that returns the panel's available display_timing entries. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Thierry Reding <treding@nvidia.com>
146 lines
5.0 KiB
C
146 lines
5.0 KiB
C
/*
|
|
* Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sub license,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the
|
|
* next paragraph) shall be included in all copies or substantial portions
|
|
* of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#ifndef __DRM_PANEL_H__
|
|
#define __DRM_PANEL_H__
|
|
|
|
#include <linux/list.h>
|
|
|
|
struct drm_connector;
|
|
struct drm_device;
|
|
struct drm_panel;
|
|
struct display_timing;
|
|
|
|
/**
|
|
* struct drm_panel_funcs - perform operations on a given panel
|
|
* @disable: disable panel (turn off back light, etc.)
|
|
* @unprepare: turn off panel
|
|
* @prepare: turn on panel and perform set up
|
|
* @enable: enable panel (turn on back light, etc.)
|
|
* @get_modes: add modes to the connector that the panel is attached to and
|
|
* return the number of modes added
|
|
* @get_timings: copy display timings into the provided array and return
|
|
* the number of display timings available
|
|
*
|
|
* The .prepare() function is typically called before the display controller
|
|
* starts to transmit video data. Panel drivers can use this to turn the panel
|
|
* on and wait for it to become ready. If additional configuration is required
|
|
* (via a control bus such as I2C, SPI or DSI for example) this is a good time
|
|
* to do that.
|
|
*
|
|
* After the display controller has started transmitting video data, it's safe
|
|
* to call the .enable() function. This will typically enable the backlight to
|
|
* make the image on screen visible. Some panels require a certain amount of
|
|
* time or frames before the image is displayed. This function is responsible
|
|
* for taking this into account before enabling the backlight to avoid visual
|
|
* glitches.
|
|
*
|
|
* Before stopping video transmission from the display controller it can be
|
|
* necessary to turn off the panel to avoid visual glitches. This is done in
|
|
* the .disable() function. Analogously to .enable() this typically involves
|
|
* turning off the backlight and waiting for some time to make sure no image
|
|
* is visible on the panel. It is then safe for the display controller to
|
|
* cease transmission of video data.
|
|
*
|
|
* To save power when no video data is transmitted, a driver can power down
|
|
* the panel. This is the job of the .unprepare() function.
|
|
*/
|
|
struct drm_panel_funcs {
|
|
int (*disable)(struct drm_panel *panel);
|
|
int (*unprepare)(struct drm_panel *panel);
|
|
int (*prepare)(struct drm_panel *panel);
|
|
int (*enable)(struct drm_panel *panel);
|
|
int (*get_modes)(struct drm_panel *panel);
|
|
int (*get_timings)(struct drm_panel *panel, unsigned int num_timings,
|
|
struct display_timing *timings);
|
|
};
|
|
|
|
struct drm_panel {
|
|
struct drm_device *drm;
|
|
struct drm_connector *connector;
|
|
struct device *dev;
|
|
|
|
const struct drm_panel_funcs *funcs;
|
|
|
|
struct list_head list;
|
|
};
|
|
|
|
static inline int drm_panel_unprepare(struct drm_panel *panel)
|
|
{
|
|
if (panel && panel->funcs && panel->funcs->unprepare)
|
|
return panel->funcs->unprepare(panel);
|
|
|
|
return panel ? -ENOSYS : -EINVAL;
|
|
}
|
|
|
|
static inline int drm_panel_disable(struct drm_panel *panel)
|
|
{
|
|
if (panel && panel->funcs && panel->funcs->disable)
|
|
return panel->funcs->disable(panel);
|
|
|
|
return panel ? -ENOSYS : -EINVAL;
|
|
}
|
|
|
|
static inline int drm_panel_prepare(struct drm_panel *panel)
|
|
{
|
|
if (panel && panel->funcs && panel->funcs->prepare)
|
|
return panel->funcs->prepare(panel);
|
|
|
|
return panel ? -ENOSYS : -EINVAL;
|
|
}
|
|
|
|
static inline int drm_panel_enable(struct drm_panel *panel)
|
|
{
|
|
if (panel && panel->funcs && panel->funcs->enable)
|
|
return panel->funcs->enable(panel);
|
|
|
|
return panel ? -ENOSYS : -EINVAL;
|
|
}
|
|
|
|
static inline int drm_panel_get_modes(struct drm_panel *panel)
|
|
{
|
|
if (panel && panel->funcs && panel->funcs->get_modes)
|
|
return panel->funcs->get_modes(panel);
|
|
|
|
return panel ? -ENOSYS : -EINVAL;
|
|
}
|
|
|
|
void drm_panel_init(struct drm_panel *panel);
|
|
|
|
int drm_panel_add(struct drm_panel *panel);
|
|
void drm_panel_remove(struct drm_panel *panel);
|
|
|
|
int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);
|
|
int drm_panel_detach(struct drm_panel *panel);
|
|
|
|
#ifdef CONFIG_OF
|
|
struct drm_panel *of_drm_find_panel(struct device_node *np);
|
|
#else
|
|
static inline struct drm_panel *of_drm_find_panel(struct device_node *np)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#endif
|