linux_kernel/include/drm/drm_modes.h

/*
 * Copyright © 2006 Keith Packard
 * Copyright © 2007-2008 Dave Airlie
 * Copyright © 2007-2008 Intel Corporation
 *   Jesse Barnes <jesse.barnes@intel.com>
 * Copyright © 2014 Intel Corporation
 *   Daniel Vetter <daniel.vetter@ffwll.ch>
 *
 * 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, sublicense,
 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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_MODES_H__
#define __DRM_MODES_H__

/*
 * Note on terminology:  here, for brevity and convenience, we refer to connector
 * control chips as 'CRTCs'.  They can control any type of connector, VGA, LVDS,
 * DVI, etc.  And 'screen' refers to the whole of the visible display, which
 * may span multiple monitors (and therefore multiple CRTC and connector
 * structures).
 */

/**
 * enum drm_mode_status - hardware support status of a mode
 * @MODE_OK: Mode OK
 * @MODE_HSYNC: hsync out of range
 * @MODE_VSYNC: vsync out of range
 * @MODE_H_ILLEGAL: mode has illegal horizontal timings
 * @MODE_V_ILLEGAL: mode has illegal horizontal timings
 * @MODE_BAD_WIDTH: requires an unsupported linepitch
 * @MODE_NOMODE: no mode with a matching name
 * @MODE_NO_INTERLACE: interlaced mode not supported
 * @MODE_NO_DBLESCAN: doublescan mode not supported
 * @MODE_NO_VSCAN: multiscan mode not supported
 * @MODE_MEM: insufficient video memory
 * @MODE_VIRTUAL_X: mode width too large for specified virtual size
 * @MODE_VIRTUAL_Y: mode height too large for specified virtual size
 * @MODE_MEM_VIRT: insufficient video memory given virtual size
 * @MODE_NOCLOCK: no fixed clock available
 * @MODE_CLOCK_HIGH: clock required is too high
 * @MODE_CLOCK_LOW: clock required is too low
 * @MODE_CLOCK_RANGE: clock/mode isn't in a ClockRange
 * @MODE_BAD_HVALUE: horizontal timing was out of range
 * @MODE_BAD_VVALUE: vertical timing was out of range
 * @MODE_BAD_VSCAN: VScan value out of range
 * @MODE_HSYNC_NARROW: horizontal sync too narrow
 * @MODE_HSYNC_WIDE: horizontal sync too wide
 * @MODE_HBLANK_NARROW: horizontal blanking too narrow
 * @MODE_HBLANK_WIDE: horizontal blanking too wide
 * @MODE_VSYNC_NARROW: vertical sync too narrow
 * @MODE_VSYNC_WIDE: vertical sync too wide
 * @MODE_VBLANK_NARROW: vertical blanking too narrow
 * @MODE_VBLANK_WIDE: vertical blanking too wide
 * @MODE_PANEL: exceeds panel dimensions
 * @MODE_INTERLACE_WIDTH: width too large for interlaced mode
 * @MODE_ONE_WIDTH: only one width is supported
 * @MODE_ONE_HEIGHT: only one height is supported
 * @MODE_ONE_SIZE: only one resolution is supported
 * @MODE_NO_REDUCED: monitor doesn't accept reduced blanking
 * @MODE_NO_STEREO: stereo modes not supported
 * @MODE_STALE: mode has become stale
 * @MODE_BAD: unspecified reason
 * @MODE_ERROR: error condition
 *
 * This enum is used to filter out modes not supported by the driver/hardware
 * combination.
 */
enum drm_mode_status {
	MODE_OK = 0,
	MODE_HSYNC,
	MODE_VSYNC,
	MODE_H_ILLEGAL,
	MODE_V_ILLEGAL,
	MODE_BAD_WIDTH,
	MODE_NOMODE,
	MODE_NO_INTERLACE,
	MODE_NO_DBLESCAN,
	MODE_NO_VSCAN,
	MODE_MEM,
	MODE_VIRTUAL_X,
	MODE_VIRTUAL_Y,
	MODE_MEM_VIRT,
	MODE_NOCLOCK,
	MODE_CLOCK_HIGH,
	MODE_CLOCK_LOW,
	MODE_CLOCK_RANGE,
	MODE_BAD_HVALUE,
	MODE_BAD_VVALUE,
	MODE_BAD_VSCAN,
	MODE_HSYNC_NARROW,
	MODE_HSYNC_WIDE,
	MODE_HBLANK_NARROW,
	MODE_HBLANK_WIDE,
	MODE_VSYNC_NARROW,
	MODE_VSYNC_WIDE,
	MODE_VBLANK_NARROW,
	MODE_VBLANK_WIDE,
	MODE_PANEL,
	MODE_INTERLACE_WIDTH,
	MODE_ONE_WIDTH,
	MODE_ONE_HEIGHT,
	MODE_ONE_SIZE,
	MODE_NO_REDUCED,
	MODE_NO_STEREO,
	MODE_STALE = -3,
	MODE_BAD = -2,
	MODE_ERROR = -1
};

#define DRM_MODE_TYPE_CLOCK_CRTC_C (DRM_MODE_TYPE_CLOCK_C | \
				    DRM_MODE_TYPE_CRTC_C)

#define DRM_MODE(nm, t, c, hd, hss, hse, ht, hsk, vd, vss, vse, vt, vs, f) \
	.name = nm, .status = 0, .type = (t), .clock = (c), \
	.hdisplay = (hd), .hsync_start = (hss), .hsync_end = (hse), \
	.htotal = (ht), .hskew = (hsk), .vdisplay = (vd), \
	.vsync_start = (vss), .vsync_end = (vse), .vtotal = (vt), \
	.vscan = (vs), .flags = (f), \
	.base.type = DRM_MODE_OBJECT_MODE

#define CRTC_INTERLACE_HALVE_V	(1 << 0) /* halve V values for interlacing */
#define CRTC_STEREO_DOUBLE	(1 << 1) /* adjust timings for stereo modes */
#define CRTC_NO_DBLSCAN		(1 << 2) /* don't adjust doublescan */
#define CRTC_NO_VSCAN		(1 << 3) /* don't adjust doublescan */
#define CRTC_STEREO_DOUBLE_ONLY	(CRTC_STEREO_DOUBLE | CRTC_NO_DBLSCAN | CRTC_NO_VSCAN)

#define DRM_MODE_FLAG_3D_MAX	DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF

/**
 * struct drm_display_mode - DRM kernel-internal display mode structure
 * @hdisplay: horizontal display size
 * @hsync_start: horizontal sync start
 * @hsync_end: horizontal sync end
 * @htotal: horizontal total size
 * @hskew: horizontal skew?!
 * @vdisplay: vertical display size
 * @vsync_start: vertical sync start
 * @vsync_end: vertical sync end
 * @vtotal: vertical total size
 * @vscan: vertical scan?!
 * @crtc_hdisplay: hardware mode horizontal display size
 * @crtc_hblank_start: hardware mode horizontal blank start
 * @crtc_hblank_end: hardware mode horizontal blank end
 * @crtc_hsync_start: hardware mode horizontal sync start
 * @crtc_hsync_end: hardware mode horizontal sync end
 * @crtc_htotal: hardware mode horizontal total size
 * @crtc_hskew: hardware mode horizontal skew?!
 * @crtc_vdisplay: hardware mode vertical display size
 * @crtc_vblank_start: hardware mode vertical blank start
 * @crtc_vblank_end: hardware mode vertical blank end
 * @crtc_vsync_start: hardware mode vertical sync start
 * @crtc_vsync_end: hardware mode vertical sync end
 * @crtc_vtotal: hardware mode vertical total size
 *
 * The horizontal and vertical timings are defined per the following diagram.
 *
 * ::
 *
 *
 *               Active                 Front           Sync           Back
 *              Region                 Porch                          Porch
 *     <-----------------------><----------------><-------------><-------------->
 *       //////////////////////|
 *      ////////////////////// |
 *     //////////////////////  |..................               ................
 *                                                _______________
 *     <----- [hv]display ----->
 *     <------------- [hv]sync_start ------------>
 *     <--------------------- [hv]sync_end --------------------->
 *     <-------------------------------- [hv]total ----------------------------->*
 *
 * This structure contains two copies of timings. First are the plain timings,
 * which specify the logical mode, as it would be for a progressive 1:1 scanout
 * at the refresh rate userspace can observe through vblank timestamps. Then
 * there's the hardware timings, which are corrected for interlacing,
 * double-clocking and similar things. They are provided as a convenience, and
 * can be appropriately computed using drm_mode_set_crtcinfo().
 */
struct drm_display_mode {
	/**
	 * @head:
	 *
	 * struct list_head for mode lists.
	 */
	struct list_head head;

	/**
	 * @base:
	 *
	 * A display mode is a normal modeset object, possibly including public
	 * userspace id.
	 *
	 * FIXME:
	 *
	 * This can probably be removed since the entire concept of userspace
	 * managing modes explicitly has never landed in upstream kernel mode
	 * setting support.
	 */
	struct drm_mode_object base;

	/**
	 * @name:
	 *
	 * Human-readable name of the mode, filled out with drm_mode_set_name().
	 */
	char name[DRM_DISPLAY_MODE_LEN];

	/**
	 * @status:
	 *
	 * Status of the mode, used to filter out modes not supported by the
	 * hardware. See enum &drm_mode_status.
	 */
	enum drm_mode_status status;

	/**
	 * @type:
	 *
	 * A bitmask of flags, mostly about the source of a mode. Possible flags
	 * are:
	 *
	 *  - DRM_MODE_TYPE_BUILTIN: Meant for hard-coded modes, effectively
	 *    unused.
	 *  - DRM_MODE_TYPE_PREFERRED: Preferred mode, usually the native
	 *    resolution of an LCD panel. There should only be one preferred
	 *    mode per connector at any given time.
	 *  - DRM_MODE_TYPE_DRIVER: Mode created by the driver, which is all of
	 *    them really. Drivers must set this bit for all modes they create
	 *    and expose to userspace.
	 *
	 * Plus a big list of flags which shouldn't be used at all, but are
	 * still around since these flags are also used in the userspace ABI:
	 *
	 *  - DRM_MODE_TYPE_DEFAULT: Again a leftover, use
	 *    DRM_MODE_TYPE_PREFERRED instead.
	 *  - DRM_MODE_TYPE_CLOCK_C and DRM_MODE_TYPE_CRTC_C: Define leftovers
	 *    which are stuck around for hysterical raisins only. No one has an
	 *    idea what they were meant for. Don't use.
	 *  - DRM_MODE_TYPE_USERDEF: Mode defined by userspace, again a vestige
	 *    from older kms designs where userspace had to first add a custom
	 *    mode to the kernel's mode list before it could use it. Don't use.
	 */
	unsigned int type;

	/**
	 * @clock:
	 *
	 * Pixel clock in kHz.
	 */
	int clock;		/* in kHz */
	int hdisplay;
	int hsync_start;
	int hsync_end;
	int htotal;
	int hskew;
	int vdisplay;
	int vsync_start;
	int vsync_end;
	int vtotal;
	int vscan;
	/**
	 * @flags:
	 *
	 * Sync and timing flags:
	 *
	 *  - DRM_MODE_FLAG_PHSYNC: horizontal sync is active high.
	 *  - DRM_MODE_FLAG_NHSYNC: horizontal sync is active low.
	 *  - DRM_MODE_FLAG_PVSYNC: vertical sync is active high.
	 *  - DRM_MODE_FLAG_NVSYNC: vertical sync is active low.
	 *  - DRM_MODE_FLAG_INTERLACE: mode is interlaced.
	 *  - DRM_MODE_FLAG_DBLSCAN: mode uses doublescan.
	 *  - DRM_MODE_FLAG_CSYNC: mode uses composite sync.
	 *  - DRM_MODE_FLAG_PCSYNC: composite sync is active high.
	 *  - DRM_MODE_FLAG_NCSYNC: composite sync is active low.
	 *  - DRM_MODE_FLAG_HSKEW: hskew provided (not used?).
	 *  - DRM_MODE_FLAG_BCAST: not used?
	 *  - DRM_MODE_FLAG_PIXMUX: not used?
	 *  - DRM_MODE_FLAG_DBLCLK: double-clocked mode.
	 *  - DRM_MODE_FLAG_CLKDIV2: half-clocked mode.
	 *
	 * Additionally there's flags to specify how 3D modes are packed:
	 *
	 *  - DRM_MODE_FLAG_3D_NONE: normal, non-3D mode.
	 *  - DRM_MODE_FLAG_3D_FRAME_PACKING: 2 full frames for left and right.
	 *  - DRM_MODE_FLAG_3D_FIELD_ALTERNATIVE: interleaved like fields.
	 *  - DRM_MODE_FLAG_3D_LINE_ALTERNATIVE: interleaved lines.
	 *  - DRM_MODE_FLAG_3D_SIDE_BY_SIDE_FULL: side-by-side full frames.
	 *  - DRM_MODE_FLAG_3D_L_DEPTH: ?
	 *  - DRM_MODE_FLAG_3D_L_DEPTH_GFX_GFX_DEPTH: ?
	 *  - DRM_MODE_FLAG_3D_TOP_AND_BOTTOM: frame split into top and bottom
	 *    parts.
	 *  - DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF: frame split into left and
	 *    right parts.
	 */
	unsigned int flags;

	/**
	 * @width_mm:
	 *
	 * Addressable size of the output in mm, projectors should set this to
	 * 0.
	 */
	int width_mm;

	/**
	 * @height_mm:
	 *
	 * Addressable size of the output in mm, projectors should set this to
	 * 0.
	 */
	int height_mm;

	/**
	 * @crtc_clock:
	 *
	 * Actual pixel or dot clock in the hardware. This differs from the
	 * logical @clock when e.g. using interlacing, double-clocking, stereo
	 * modes or other fancy stuff that changes the timings and signals
	 * actually sent over the wire.
	 *
	 * This is again in kHz.
	 *
	 * Note that with digital outputs like HDMI or DP there's usually a
	 * massive confusion between the dot clock and the signal clock at the
	 * bit encoding level. Especially when a 8b/10b encoding is used and the
	 * difference is exactly a factor of 10.
	 */
	int crtc_clock;
	int crtc_hdisplay;
	int crtc_hblank_start;
	int crtc_hblank_end;
	int crtc_hsync_start;
	int crtc_hsync_end;
	int crtc_htotal;
	int crtc_hskew;
	int crtc_vdisplay;
	int crtc_vblank_start;
	int crtc_vblank_end;
	int crtc_vsync_start;
	int crtc_vsync_end;
	int crtc_vtotal;

	/**
	 * @private:
	 *
	 * Pointer for driver private data. This can only be used for mode
	 * objects passed to drivers in modeset operations. It shouldn't be used
	 * by atomic drivers since they can store any additional data by
	 * subclassing state structures.
	 */
	int *private;

	/**
	 * @private_flags:
	 *
	 * Similar to @private, but just an integer.
	 */
	int private_flags;

	/**
	 * @vrefresh:
	 *
	 * Vertical refresh rate, for debug output in human readable form. Not
	 * used in a functional way.
	 *
	 * This value is in Hz.
	 */
	int vrefresh;

	/**
	 * @hsync:
	 *
	 * Horizontal refresh rate, for debug output in human readable form. Not
	 * used in a functional way.
	 *
	 * This value is in kHz.
	 */
	int hsync;

	/**
	 * @picture_aspect_ratio:
	 *
	 * Field for setting the HDMI picture aspect ratio of a mode.
	 */
	enum hdmi_picture_aspect picture_aspect_ratio;
};

/* mode specified on the command line */
struct drm_cmdline_mode {
	bool specified;
	bool refresh_specified;
	bool bpp_specified;
	int xres, yres;
	int bpp;
	int refresh;
	bool rb;
	bool interlace;
	bool cvt;
	bool margins;
	enum drm_connector_force force;
};

/**
 * drm_mode_is_stereo - check for stereo mode flags
 * @mode: drm_display_mode to check
 *
 * Returns:
 * True if the mode is one of the stereo modes (like side-by-side), false if
 * not.
 */
static inline bool drm_mode_is_stereo(const struct drm_display_mode *mode)
{
	return mode->flags & DRM_MODE_FLAG_3D_MASK;
}

struct drm_connector;
struct drm_cmdline_mode;

struct drm_display_mode *drm_mode_create(struct drm_device *dev);
void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode);
void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
                               const struct drm_display_mode *in);
int drm_mode_convert_umode(struct drm_display_mode *out,
			   const struct drm_mode_modeinfo *in);
void drm_mode_probed_add(struct drm_connector *connector, struct drm_display_mode *mode);
void drm_mode_debug_printmodeline(const struct drm_display_mode *mode);

struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
				      int hdisplay, int vdisplay, int vrefresh,
				      bool reduced, bool interlaced,
				      bool margins);
struct drm_display_mode *drm_gtf_mode(struct drm_device *dev,
				      int hdisplay, int vdisplay, int vrefresh,
				      bool interlaced, int margins);
struct drm_display_mode *drm_gtf_mode_complex(struct drm_device *dev,
					      int hdisplay, int vdisplay,
					      int vrefresh, bool interlaced,
					      int margins,
					      int GTF_M, int GTF_2C,
					      int GTF_K, int GTF_2J);
void drm_display_mode_from_videomode(const struct videomode *vm,
				     struct drm_display_mode *dmode);
void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
				   struct videomode *vm);
int of_get_drm_display_mode(struct device_node *np,
			    struct drm_display_mode *dmode,
			    int index);

void drm_mode_set_name(struct drm_display_mode *mode);
int drm_mode_hsync(const struct drm_display_mode *mode);
int drm_mode_vrefresh(const struct drm_display_mode *mode);

void drm_mode_set_crtcinfo(struct drm_display_mode *p,
			   int adjust_flags);
void drm_mode_copy(struct drm_display_mode *dst,
		   const struct drm_display_mode *src);
struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
					    const struct drm_display_mode *mode);
bool drm_mode_equal(const struct drm_display_mode *mode1,
		    const struct drm_display_mode *mode2);
bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
			      const struct drm_display_mode *mode2);
bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
					const struct drm_display_mode *mode2);

/* for use by the crtc helper probe functions */
enum drm_mode_status drm_mode_validate_basic(const struct drm_display_mode *mode);
enum drm_mode_status drm_mode_validate_size(const struct drm_display_mode *mode,
					    int maxX, int maxY);
void drm_mode_prune_invalid(struct drm_device *dev,
			    struct list_head *mode_list, bool verbose);
void drm_mode_sort(struct list_head *mode_list);
void drm_mode_connector_list_update(struct drm_connector *connector);

/* parsing cmdline modes */
bool
drm_mode_parse_command_line_for_connector(const char *mode_option,
					  struct drm_connector *connector,
					  struct drm_cmdline_mode *mode);
struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device *dev,
				  struct drm_cmdline_mode *cmd);

#endif /* __DRM_MODES_H__ */