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linux/include/drm/drm_panel.h

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drm: Add panel support Add a very simple framework to register and lookup panels. Panel drivers can initialize a DRM panel and register it with the framework, allowing them to be retrieved and used by display drivers. Currently only support for DPMS and obtaining panel modes is provided. However it should be sufficient to enable a large number of panels. The framework should also be easily extensible to support more sophisticated kinds of panels such as DSI. The framework hasn't been tied into the DRM core, even though it should be easily possible to do so if that's what we want. In the current implementation, display drivers can simple make use of it to retrieve a panel, obtain its modes and control its DPMS mode. Note that this is currently only tested on systems that boot from a device tree. No glue code has been written yet for systems that use platform data, but it should be easy to add. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-08-30 11:36:43 +00:00
/*
* 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;
drm/panel: Add display timing support 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>
2014-12-11 17:32:44 +00:00
struct display_timing;
drm: Add panel support Add a very simple framework to register and lookup panels. Panel drivers can initialize a DRM panel and register it with the framework, allowing them to be retrieved and used by display drivers. Currently only support for DPMS and obtaining panel modes is provided. However it should be sufficient to enable a large number of panels. The framework should also be easily extensible to support more sophisticated kinds of panels such as DSI. The framework hasn't been tied into the DRM core, even though it should be easily possible to do so if that's what we want. In the current implementation, display drivers can simple make use of it to retrieve a panel, obtain its modes and control its DPMS mode. Note that this is currently only tested on systems that boot from a device tree. No glue code has been written yet for systems that use platform data, but it should be easy to add. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-08-30 11:36:43 +00:00
drm/panel: add .prepare() and .unprepare() functions Panels often require an initialization sequence that consists of three steps: a) powering up the panel, b) starting transmission of video data and c) enabling the panel (e.g. turn on backlight). This is usually necessary to avoid visual glitches at the beginning of video data transmission. Similarly, the shutdown sequence is typically done in three steps as well: a) disable the panel (e.g. turn off backlight), b) cease video data transmission and c) power down the panel. Currently drivers can only implement .enable() and .disable() functions, which is not enough to implement the above sequences. This commit adds a second pair of functions, .prepare() and .unprepare() to allow more fine-grained control over when the above steps are performed. Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com> [treding: rewrite changelog, add kerneldoc] Signed-off-by: Thierry Reding <treding@nvidia.com>
2014-07-17 20:43:48 +00:00
/**
* 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
drm/panel: Add display timing support 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>
2014-12-11 17:32:44 +00:00
* @get_timings: copy display timings into the provided array and return
* the number of display timings available
drm/panel: add .prepare() and .unprepare() functions Panels often require an initialization sequence that consists of three steps: a) powering up the panel, b) starting transmission of video data and c) enabling the panel (e.g. turn on backlight). This is usually necessary to avoid visual glitches at the beginning of video data transmission. Similarly, the shutdown sequence is typically done in three steps as well: a) disable the panel (e.g. turn off backlight), b) cease video data transmission and c) power down the panel. Currently drivers can only implement .enable() and .disable() functions, which is not enough to implement the above sequences. This commit adds a second pair of functions, .prepare() and .unprepare() to allow more fine-grained control over when the above steps are performed. Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com> [treding: rewrite changelog, add kerneldoc] Signed-off-by: Thierry Reding <treding@nvidia.com>
2014-07-17 20:43:48 +00:00
*
* 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.
*/
drm: Add panel support Add a very simple framework to register and lookup panels. Panel drivers can initialize a DRM panel and register it with the framework, allowing them to be retrieved and used by display drivers. Currently only support for DPMS and obtaining panel modes is provided. However it should be sufficient to enable a large number of panels. The framework should also be easily extensible to support more sophisticated kinds of panels such as DSI. The framework hasn't been tied into the DRM core, even though it should be easily possible to do so if that's what we want. In the current implementation, display drivers can simple make use of it to retrieve a panel, obtain its modes and control its DPMS mode. Note that this is currently only tested on systems that boot from a device tree. No glue code has been written yet for systems that use platform data, but it should be easy to add. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-08-30 11:36:43 +00:00
struct drm_panel_funcs {
int (*disable)(struct drm_panel *panel);
drm/panel: add .prepare() and .unprepare() functions Panels often require an initialization sequence that consists of three steps: a) powering up the panel, b) starting transmission of video data and c) enabling the panel (e.g. turn on backlight). This is usually necessary to avoid visual glitches at the beginning of video data transmission. Similarly, the shutdown sequence is typically done in three steps as well: a) disable the panel (e.g. turn off backlight), b) cease video data transmission and c) power down the panel. Currently drivers can only implement .enable() and .disable() functions, which is not enough to implement the above sequences. This commit adds a second pair of functions, .prepare() and .unprepare() to allow more fine-grained control over when the above steps are performed. Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com> [treding: rewrite changelog, add kerneldoc] Signed-off-by: Thierry Reding <treding@nvidia.com>
2014-07-17 20:43:48 +00:00
int (*unprepare)(struct drm_panel *panel);
int (*prepare)(struct drm_panel *panel);
drm: Add panel support Add a very simple framework to register and lookup panels. Panel drivers can initialize a DRM panel and register it with the framework, allowing them to be retrieved and used by display drivers. Currently only support for DPMS and obtaining panel modes is provided. However it should be sufficient to enable a large number of panels. The framework should also be easily extensible to support more sophisticated kinds of panels such as DSI. The framework hasn't been tied into the DRM core, even though it should be easily possible to do so if that's what we want. In the current implementation, display drivers can simple make use of it to retrieve a panel, obtain its modes and control its DPMS mode. Note that this is currently only tested on systems that boot from a device tree. No glue code has been written yet for systems that use platform data, but it should be easy to add. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-08-30 11:36:43 +00:00
int (*enable)(struct drm_panel *panel);
int (*get_modes)(struct drm_panel *panel);
drm/panel: Add display timing support 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>
2014-12-11 17:32:44 +00:00
int (*get_timings)(struct drm_panel *panel, unsigned int num_timings,
struct display_timing *timings);
drm: Add panel support Add a very simple framework to register and lookup panels. Panel drivers can initialize a DRM panel and register it with the framework, allowing them to be retrieved and used by display drivers. Currently only support for DPMS and obtaining panel modes is provided. However it should be sufficient to enable a large number of panels. The framework should also be easily extensible to support more sophisticated kinds of panels such as DSI. The framework hasn't been tied into the DRM core, even though it should be easily possible to do so if that's what we want. In the current implementation, display drivers can simple make use of it to retrieve a panel, obtain its modes and control its DPMS mode. Note that this is currently only tested on systems that boot from a device tree. No glue code has been written yet for systems that use platform data, but it should be easy to add. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-08-30 11:36:43 +00:00
};
drm/panel: Flesh out kerneldoc Write more complete kerneldoc comments for the DRM panel API and integrate the helpers in the DRM DocBook reference. Signed-off-by: Thierry Reding <treding@nvidia.com>drm/panel: Add helper for simple panel connector Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20160506140137.GA4641@ulmo.ba.sec
2016-05-06 14:01:37 +00:00
/**
* struct drm_panel - DRM panel object
* @drm: DRM device owning the panel
* @connector: DRM connector that the panel is attached to
* @dev: parent device of the panel
* @funcs: operations that can be performed on the panel
* @list: panel entry in registry
*/
drm: Add panel support Add a very simple framework to register and lookup panels. Panel drivers can initialize a DRM panel and register it with the framework, allowing them to be retrieved and used by display drivers. Currently only support for DPMS and obtaining panel modes is provided. However it should be sufficient to enable a large number of panels. The framework should also be easily extensible to support more sophisticated kinds of panels such as DSI. The framework hasn't been tied into the DRM core, even though it should be easily possible to do so if that's what we want. In the current implementation, display drivers can simple make use of it to retrieve a panel, obtain its modes and control its DPMS mode. Note that this is currently only tested on systems that boot from a device tree. No glue code has been written yet for systems that use platform data, but it should be easy to add. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-08-30 11:36:43 +00:00
struct drm_panel {
struct drm_device *drm;
struct drm_connector *connector;
struct device *dev;
const struct drm_panel_funcs *funcs;
struct list_head list;
};
drm/panel: Flesh out kerneldoc Write more complete kerneldoc comments for the DRM panel API and integrate the helpers in the DRM DocBook reference. Signed-off-by: Thierry Reding <treding@nvidia.com>drm/panel: Add helper for simple panel connector Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20160506140137.GA4641@ulmo.ba.sec
2016-05-06 14:01:37 +00:00
/**
* drm_disable_unprepare - power off a panel
* @panel: DRM panel
*
* Calling this function will completely power off a panel (assert the panel's
* reset, turn off power supplies, ...). After this function has completed, it
* is usually no longer possible to communicate with the panel until another
* call to drm_panel_prepare().
*
* Return: 0 on success or a negative error code on failure.
*/
drm/panel: add .prepare() and .unprepare() functions Panels often require an initialization sequence that consists of three steps: a) powering up the panel, b) starting transmission of video data and c) enabling the panel (e.g. turn on backlight). This is usually necessary to avoid visual glitches at the beginning of video data transmission. Similarly, the shutdown sequence is typically done in three steps as well: a) disable the panel (e.g. turn off backlight), b) cease video data transmission and c) power down the panel. Currently drivers can only implement .enable() and .disable() functions, which is not enough to implement the above sequences. This commit adds a second pair of functions, .prepare() and .unprepare() to allow more fine-grained control over when the above steps are performed. Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com> [treding: rewrite changelog, add kerneldoc] Signed-off-by: Thierry Reding <treding@nvidia.com>
2014-07-17 20:43:48 +00:00
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;
}
drm/panel: Flesh out kerneldoc Write more complete kerneldoc comments for the DRM panel API and integrate the helpers in the DRM DocBook reference. Signed-off-by: Thierry Reding <treding@nvidia.com>drm/panel: Add helper for simple panel connector Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20160506140137.GA4641@ulmo.ba.sec
2016-05-06 14:01:37 +00:00
/**
* drm_panel_disable - disable a panel
* @panel: DRM panel
*
* This will typically turn off the panel's backlight or disable the display
* drivers. For smart panels it should still be possible to communicate with
* the integrated circuitry via any command bus after this call.
*
* Return: 0 on success or a negative error code on failure.
*/
drm: Add panel support Add a very simple framework to register and lookup panels. Panel drivers can initialize a DRM panel and register it with the framework, allowing them to be retrieved and used by display drivers. Currently only support for DPMS and obtaining panel modes is provided. However it should be sufficient to enable a large number of panels. The framework should also be easily extensible to support more sophisticated kinds of panels such as DSI. The framework hasn't been tied into the DRM core, even though it should be easily possible to do so if that's what we want. In the current implementation, display drivers can simple make use of it to retrieve a panel, obtain its modes and control its DPMS mode. Note that this is currently only tested on systems that boot from a device tree. No glue code has been written yet for systems that use platform data, but it should be easy to add. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-08-30 11:36:43 +00:00
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;
}
drm/panel: Flesh out kerneldoc Write more complete kerneldoc comments for the DRM panel API and integrate the helpers in the DRM DocBook reference. Signed-off-by: Thierry Reding <treding@nvidia.com>drm/panel: Add helper for simple panel connector Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20160506140137.GA4641@ulmo.ba.sec
2016-05-06 14:01:37 +00:00
/**
* drm_panel_prepare - power on a panel
* @panel: DRM panel
*
* Calling this function will enable power and deassert any reset signals to
* the panel. After this has completed it is possible to communicate with any
* integrated circuitry via a command bus.
*
* Return: 0 on success or a negative error code on failure.
*/
drm/panel: add .prepare() and .unprepare() functions Panels often require an initialization sequence that consists of three steps: a) powering up the panel, b) starting transmission of video data and c) enabling the panel (e.g. turn on backlight). This is usually necessary to avoid visual glitches at the beginning of video data transmission. Similarly, the shutdown sequence is typically done in three steps as well: a) disable the panel (e.g. turn off backlight), b) cease video data transmission and c) power down the panel. Currently drivers can only implement .enable() and .disable() functions, which is not enough to implement the above sequences. This commit adds a second pair of functions, .prepare() and .unprepare() to allow more fine-grained control over when the above steps are performed. Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com> [treding: rewrite changelog, add kerneldoc] Signed-off-by: Thierry Reding <treding@nvidia.com>
2014-07-17 20:43:48 +00:00
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;
}
drm/panel: Flesh out kerneldoc Write more complete kerneldoc comments for the DRM panel API and integrate the helpers in the DRM DocBook reference. Signed-off-by: Thierry Reding <treding@nvidia.com>drm/panel: Add helper for simple panel connector Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20160506140137.GA4641@ulmo.ba.sec
2016-05-06 14:01:37 +00:00
/**
* drm_panel_enable - enable a panel
* @panel: DRM panel
*
* Calling this function will cause the panel display drivers to be turned on
* and the backlight to be enabled. Content will be visible on screen after
* this call completes.
*
* Return: 0 on success or a negative error code on failure.
*/
drm: Add panel support Add a very simple framework to register and lookup panels. Panel drivers can initialize a DRM panel and register it with the framework, allowing them to be retrieved and used by display drivers. Currently only support for DPMS and obtaining panel modes is provided. However it should be sufficient to enable a large number of panels. The framework should also be easily extensible to support more sophisticated kinds of panels such as DSI. The framework hasn't been tied into the DRM core, even though it should be easily possible to do so if that's what we want. In the current implementation, display drivers can simple make use of it to retrieve a panel, obtain its modes and control its DPMS mode. Note that this is currently only tested on systems that boot from a device tree. No glue code has been written yet for systems that use platform data, but it should be easy to add. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-08-30 11:36:43 +00:00
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;
}
drm/panel: Flesh out kerneldoc Write more complete kerneldoc comments for the DRM panel API and integrate the helpers in the DRM DocBook reference. Signed-off-by: Thierry Reding <treding@nvidia.com>drm/panel: Add helper for simple panel connector Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20160506140137.GA4641@ulmo.ba.sec
2016-05-06 14:01:37 +00:00
/**
* drm_panel_get_modes - probe the available display modes of a panel
* @panel: DRM panel
*
* The modes probed from the panel are automatically added to the connector
* that the panel is attached to.
*
* Return: The number of modes available from the panel on success or a
* negative error code on failure.
*/
drm/panel: Provide convenience wrapper for .get_modes() Add a convenience wrapper for the struct drm_panel_funcs' .get_modes() function so that not every driver needs to check that the panel driver implements the function before calling it. Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com> [treding: extract from larger patch, commit message] Signed-off-by: Thierry Reding <treding@nvidia.com>
2014-07-30 10:02:15 +00:00
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;
}
drm: Add panel support Add a very simple framework to register and lookup panels. Panel drivers can initialize a DRM panel and register it with the framework, allowing them to be retrieved and used by display drivers. Currently only support for DPMS and obtaining panel modes is provided. However it should be sufficient to enable a large number of panels. The framework should also be easily extensible to support more sophisticated kinds of panels such as DSI. The framework hasn't been tied into the DRM core, even though it should be easily possible to do so if that's what we want. In the current implementation, display drivers can simple make use of it to retrieve a panel, obtain its modes and control its DPMS mode. Note that this is currently only tested on systems that boot from a device tree. No glue code has been written yet for systems that use platform data, but it should be easy to add. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-08-30 11:36:43 +00:00
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
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