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36829e951b
Linux uses get_modes() to fetch all available panel modes from the driver. This is also used to fetch the modes from Linux's simple panel implementation where a list of drm_display_mode structs is used to define the different possible panels. To make our work easier, create a compatible way of fetching and defining these modes in u-boot. get_modes() fetches the available modes from the panel driver. The get_display_timing() call maps the drm_display_mode properties to the display_timing struct. This call now uses whatever panel operation is available, get_display_timing() or get_modes(). Reviewed-by: Fabio Estevam <festevam@gmail.com> Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
139 lines
4.1 KiB
C
139 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2016 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef _PANEL_H
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#define _PANEL_H
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#include <video.h>
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#include <fdtdec.h>
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/* DRM mode flags mapped to U-Boot DISPLAY_FLAGS for direct compatibility */
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#define DRM_MODE_FLAG_NHSYNC DISPLAY_FLAGS_HSYNC_LOW
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#define DRM_MODE_FLAG_PHSYNC DISPLAY_FLAGS_HSYNC_HIGH
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#define DRM_MODE_FLAG_NVSYNC DISPLAY_FLAGS_VSYNC_LOW
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#define DRM_MODE_FLAG_PVSYNC DISPLAY_FLAGS_VSYNC_HIGH
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#define DRM_MODE_FLAG_INTERLACE DISPLAY_FLAGS_INTERLACED
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#define DRM_MODE_FLAG_DBLSCAN DISPLAY_FLAGS_DOUBLESCAN
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#define DRM_MODE_FLAG_DBLCLK DISPLAY_FLAGS_DOUBLECLK
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/**
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* struct drm_display_mode - DRM kernel-internal display mode structure
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* simplified for U-Boot
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* @hdisplay: horizontal display size
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* @hsync_start: horizontal sync start
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* @hsync_end: horizontal sync end
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* @htotal: horizontal total size
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* @vdisplay: vertical display size
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* @vsync_start: vertical sync start
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* @vsync_end: vertical sync end
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* @vtotal: vertical total size
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*
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* The horizontal and vertical timings are defined per the following diagram.
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*
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* ::
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*
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*
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* Active Front Sync Back
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* Region Porch Porch
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* <-----------------------><----------------><-------------><-------------->
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* //////////////////////|
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* ////////////////////// |
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* ////////////////////// |.................. ................
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* _______________
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* <----- [hv]display ----->
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* <------------- [hv]sync_start ------------>
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* <--------------------- [hv]sync_end --------------------->
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* <-------------------------------- [hv]total ----------------------------->*
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*/
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struct drm_display_mode {
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unsigned int clock; /* in kHz */
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u16 hdisplay;
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u16 hsync_start;
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u16 hsync_end;
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u16 htotal;
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u16 vdisplay;
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u16 vsync_start;
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u16 vsync_end;
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u16 vtotal;
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u32 flags;
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};
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struct panel_ops {
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/**
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* enable_backlight() - Enable the panel backlight
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*
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* @dev: Panel device containing the backlight to enable
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* @return 0 if OK, -ve on error
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*/
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int (*enable_backlight)(struct udevice *dev);
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/**
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* set_backlight - Set panel backlight brightness
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*
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* @dev: Panel device containing the backlight to update
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* @percent: Brightness value (0 to 100, or BACKLIGHT_... value)
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* @return 0 if OK, -ve on error
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*/
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int (*set_backlight)(struct udevice *dev, int percent);
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/**
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* get_timings() - Get display timings from panel.
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*
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* @dev: Panel device containing the display timings
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* @timing: Pointer to the timing for storing
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* @return 0 if OK, -ve on error
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*/
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int (*get_display_timing)(struct udevice *dev,
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struct display_timing *timing);
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/**
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* get_modes() - Get display modes from panel
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*
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* Returns an array of display modes supported by the panel.
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* Similar to Linux's drm_panel_funcs->get_modes().
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*
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* @dev: Panel device
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* @modes: Pointer to an array of modes
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* @return number of modes if OK, -ve on error
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*/
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int (*get_modes)(struct udevice *dev,
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const struct drm_display_mode **modes);
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};
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#define panel_get_ops(dev) ((struct panel_ops *)(dev)->driver->ops)
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/**
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* panel_enable_backlight() - Enable/disable the panel backlight
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*
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* @dev: Panel device containing the backlight to enable
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* @enable: true to enable the backlight, false to dis
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* Return: 0 if OK, -ve on error
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*/
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int panel_enable_backlight(struct udevice *dev);
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/**
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* panel_set_backlight - Set brightness for the panel backlight
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*
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* @dev: Panel device containing the backlight to update
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* @percent: Brightness value (0 to 100, or BACKLIGHT_... value)
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* Return: 0 if OK, -ve on error
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*/
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int panel_set_backlight(struct udevice *dev, int percent);
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/**
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* panel_get_display_timing() - Get display timings from panel.
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*
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* @dev: Panel device containing the display timings
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* @timing: Pointer to the timing for storing
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* Return: 0 if OK, -ve on error
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*/
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int panel_get_display_timing(struct udevice *dev,
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struct display_timing *timing);
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#endif
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