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@@ -35,46 +35,91 @@
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* structures).
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*/
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+/**
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+ * enum drm_mode_status - hardware support status of a mode
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+ * @MODE_OK: Mode OK
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+ * @MODE_HSYNC: hsync out of range
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+ * @MODE_VSYNC: vsync out of range
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+ * @MODE_H_ILLEGAL: mode has illegal horizontal timings
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+ * @MODE_V_ILLEGAL: mode has illegal horizontal timings
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+ * @MODE_BAD_WIDTH: requires an unsupported linepitch
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+ * @MODE_NOMODE: no mode with a matching name
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+ * @MODE_NO_INTERLACE: interlaced mode not supported
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+ * @MODE_NO_DBLESCAN: doublescan mode not supported
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+ * @MODE_NO_VSCAN: multiscan mode not supported
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+ * @MODE_MEM: insufficient video memory
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+ * @MODE_VIRTUAL_X: mode width too large for specified virtual size
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+ * @MODE_VIRTUAL_Y: mode height too large for specified virtual size
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+ * @MODE_MEM_VIRT: insufficient video memory given virtual size
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+ * @MODE_NOCLOCK: no fixed clock available
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+ * @MODE_CLOCK_HIGH: clock required is too high
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+ * @MODE_CLOCK_LOW: clock required is too low
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+ * @MODE_CLOCK_RANGE: clock/mode isn't in a ClockRange
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+ * @MODE_BAD_HVALUE: horizontal timing was out of range
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+ * @MODE_BAD_VVALUE: vertical timing was out of range
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+ * @MODE_BAD_VSCAN: VScan value out of range
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+ * @MODE_HSYNC_NARROW: horizontal sync too narrow
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+ * @MODE_HSYNC_WIDE: horizontal sync too wide
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+ * @MODE_HBLANK_NARROW: horizontal blanking too narrow
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+ * @MODE_HBLANK_WIDE: horizontal blanking too wide
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+ * @MODE_VSYNC_NARROW: vertical sync too narrow
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+ * @MODE_VSYNC_WIDE: vertical sync too wide
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+ * @MODE_VBLANK_NARROW: vertical blanking too narrow
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+ * @MODE_VBLANK_WIDE: vertical blanking too wide
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+ * @MODE_PANEL: exceeds panel dimensions
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+ * @MODE_INTERLACE_WIDTH: width too large for interlaced mode
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+ * @MODE_ONE_WIDTH: only one width is supported
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+ * @MODE_ONE_HEIGHT: only one height is supported
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+ * @MODE_ONE_SIZE: only one resolution is supported
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+ * @MODE_NO_REDUCED: monitor doesn't accept reduced blanking
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+ * @MODE_NO_STEREO: stereo modes not supported
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+ * @MODE_UNVERIFIED: mode needs to reverified
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+ * @MODE_BAD: unspecified reason
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+ * @MODE_ERROR: error condition
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+ *
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+ * This enum is used to filter out modes not supported by the driver/hardware
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+ * combination.
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+ */
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enum drm_mode_status {
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- MODE_OK = 0, /* Mode OK */
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- MODE_HSYNC, /* hsync out of range */
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- MODE_VSYNC, /* vsync out of range */
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- MODE_H_ILLEGAL, /* mode has illegal horizontal timings */
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- MODE_V_ILLEGAL, /* mode has illegal horizontal timings */
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- MODE_BAD_WIDTH, /* requires an unsupported linepitch */
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- MODE_NOMODE, /* no mode with a matching name */
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- MODE_NO_INTERLACE, /* interlaced mode not supported */
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- MODE_NO_DBLESCAN, /* doublescan mode not supported */
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- MODE_NO_VSCAN, /* multiscan mode not supported */
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- MODE_MEM, /* insufficient video memory */
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- MODE_VIRTUAL_X, /* mode width too large for specified virtual size */
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- MODE_VIRTUAL_Y, /* mode height too large for specified virtual size */
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- MODE_MEM_VIRT, /* insufficient video memory given virtual size */
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- MODE_NOCLOCK, /* no fixed clock available */
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- MODE_CLOCK_HIGH, /* clock required is too high */
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- MODE_CLOCK_LOW, /* clock required is too low */
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- MODE_CLOCK_RANGE, /* clock/mode isn't in a ClockRange */
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- MODE_BAD_HVALUE, /* horizontal timing was out of range */
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- MODE_BAD_VVALUE, /* vertical timing was out of range */
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- MODE_BAD_VSCAN, /* VScan value out of range */
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- MODE_HSYNC_NARROW, /* horizontal sync too narrow */
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- MODE_HSYNC_WIDE, /* horizontal sync too wide */
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- MODE_HBLANK_NARROW, /* horizontal blanking too narrow */
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- MODE_HBLANK_WIDE, /* horizontal blanking too wide */
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- MODE_VSYNC_NARROW, /* vertical sync too narrow */
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- MODE_VSYNC_WIDE, /* vertical sync too wide */
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- MODE_VBLANK_NARROW, /* vertical blanking too narrow */
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- MODE_VBLANK_WIDE, /* vertical blanking too wide */
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- MODE_PANEL, /* exceeds panel dimensions */
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- MODE_INTERLACE_WIDTH, /* width too large for interlaced mode */
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- MODE_ONE_WIDTH, /* only one width is supported */
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- MODE_ONE_HEIGHT, /* only one height is supported */
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- MODE_ONE_SIZE, /* only one resolution is supported */
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- MODE_NO_REDUCED, /* monitor doesn't accept reduced blanking */
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- MODE_NO_STEREO, /* stereo modes not supported */
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- MODE_UNVERIFIED = -3, /* mode needs to reverified */
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- MODE_BAD = -2, /* unspecified reason */
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- MODE_ERROR = -1 /* error condition */
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+ MODE_OK = 0,
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+ MODE_HSYNC,
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+ MODE_VSYNC,
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+ MODE_H_ILLEGAL,
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+ MODE_V_ILLEGAL,
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+ MODE_BAD_WIDTH,
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+ MODE_NOMODE,
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+ MODE_NO_INTERLACE,
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+ MODE_NO_DBLESCAN,
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+ MODE_NO_VSCAN,
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+ MODE_MEM,
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+ MODE_VIRTUAL_X,
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+ MODE_VIRTUAL_Y,
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+ MODE_MEM_VIRT,
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+ MODE_NOCLOCK,
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+ MODE_CLOCK_HIGH,
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+ MODE_CLOCK_LOW,
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+ MODE_CLOCK_RANGE,
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+ MODE_BAD_HVALUE,
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+ MODE_BAD_VVALUE,
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+ MODE_BAD_VSCAN,
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+ MODE_HSYNC_NARROW,
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+ MODE_HSYNC_WIDE,
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+ MODE_HBLANK_NARROW,
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+ MODE_HBLANK_WIDE,
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+ MODE_VSYNC_NARROW,
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+ MODE_VSYNC_WIDE,
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+ MODE_VBLANK_NARROW,
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+ MODE_VBLANK_WIDE,
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+ MODE_PANEL,
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+ MODE_INTERLACE_WIDTH,
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+ MODE_ONE_WIDTH,
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+ MODE_ONE_HEIGHT,
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+ MODE_ONE_SIZE,
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+ MODE_NO_REDUCED,
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+ MODE_NO_STEREO,
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+ MODE_UNVERIFIED = -3,
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+ MODE_BAD = -2,
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+ MODE_ERROR = -1
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};
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#define DRM_MODE_TYPE_CLOCK_CRTC_C (DRM_MODE_TYPE_CLOCK_C | \
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@@ -96,17 +141,125 @@ enum drm_mode_status {
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#define DRM_MODE_FLAG_3D_MAX DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF
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+/**
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+ * struct drm_display_mode - DRM kernel-internal display mode structure
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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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+ * @hskew: horizontal skew?!
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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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+ * @vscan: vertical scan?!
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+ * @crtc_hdisplay: hardware mode horizontal display size
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+ * @crtc_hblank_start: hardware mode horizontal blank start
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+ * @crtc_hblank_end: hardware mode horizontal blank end
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+ * @crtc_hsync_start: hardware mode horizontal sync start
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+ * @crtc_hsync_end: hardware mode horizontal sync end
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+ * @crtc_htotal: hardware mode horizontal total size
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+ * @crtc_hskew: hardware mode horizontal skew?!
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+ * @crtc_vdisplay: hardware mode vertical display size
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+ * @crtc_vblank_start: hardware mode vertical blank start
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+ * @crtc_vblank_end: hardware mode vertical blank end
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+ * @crtc_vsync_start: hardware mode vertical sync start
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+ * @crtc_vsync_end: hardware mode vertical sync end
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+ * @crtc_vtotal: hardware mode 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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+ * 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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+ * This structure contains two copies of timings. First are the plain timings,
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+ * which specify the logical mode, as it would be for a progressive 1:1 scanout
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+ * at the refresh rate userspace can observe through vblank timestamps. Then
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+ * there's the hardware timings, which are corrected for interlacing,
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+ * double-clocking and similar things. They are provided as a convenience, and
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+ * can be appropriately computed using drm_mode_set_crtcinfo().
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+ */
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struct drm_display_mode {
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- /* Header */
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+ /**
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+ * @head:
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+ *
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+ * struct list_head for mode lists.
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+ */
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struct list_head head;
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+
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+ /**
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+ * @base:
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+ *
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+ * A display mode is a normal modeset object, possibly including public
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+ * userspace id.
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+ *
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+ * FIXME:
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+ *
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+ * This can probably be removed since the entire concept of userspace
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+ * managing modes explicitly has never landed in upstream kernel mode
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+ * setting support.
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+ */
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struct drm_mode_object base;
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+ /**
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+ * @name:
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+ *
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+ * Human-readable name of the mode, filled out with drm_mode_set_name().
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+ */
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char name[DRM_DISPLAY_MODE_LEN];
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+ /**
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+ * @status:
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+ *
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+ * Status of the mode, used to filter out modes not supported by the
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+ * hardware. See enum &drm_mode_status.
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+ */
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enum drm_mode_status status;
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+
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+ /**
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+ * @type:
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+ *
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+ * A bitmask of flags, mostly about the source of a mode. Possible flags
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+ * are:
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+ *
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+ * - DRM_MODE_TYPE_BUILTIN: Meant for hard-coded modes, effectively
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+ * unused.
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+ * - DRM_MODE_TYPE_PREFERRED: Preferred mode, usually the native
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+ * resolution of an LCD panel. There should only be one preferred
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+ * mode per connector at any given time.
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+ * - DRM_MODE_TYPE_DRIVER: Mode created by the driver, which is all of
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+ * them really. Drivers must set this bit for all modes they create
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+ * and expose to userspace.
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+ *
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+ * Plus a big list of flags which shouldn't be used at all, but are
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+ * still around since these flags are also used in the userspace ABI:
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+ *
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+ * - DRM_MODE_TYPE_DEFAULT: Again a leftover, use
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+ * DRM_MODE_TYPE_PREFERRED instead.
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+ * - DRM_MODE_TYPE_CLOCK_C and DRM_MODE_TYPE_CRTC_C: Define leftovers
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+ * which are stuck around for hysterical raisins only. No one has an
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+ * idea what they were meant for. Don't use.
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+ * - DRM_MODE_TYPE_USERDEF: Mode defined by userspace, again a vestige
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+ * from older kms designs where userspace had to first add a custom
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+ * mode to the kernel's mode list before it could use it. Don't use.
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+ */
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unsigned int type;
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- /* Proposed mode values */
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+ /**
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+ * @clock:
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+ *
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+ * Pixel clock in kHz.
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+ */
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int clock; /* in kHz */
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int hdisplay;
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int hsync_start;
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@@ -118,14 +271,74 @@ struct drm_display_mode {
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int vsync_end;
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int vtotal;
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int vscan;
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+ /**
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+ * @flags:
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+ *
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+ * Sync and timing flags:
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+ *
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+ * - DRM_MODE_FLAG_PHSYNC: horizontal sync is active high.
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+ * - DRM_MODE_FLAG_NHSYNC: horizontal sync is active low.
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+ * - DRM_MODE_FLAG_PVSYNC: vertical sync is active high.
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+ * - DRM_MODE_FLAG_NVSYNC: vertical sync is active low.
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+ * - DRM_MODE_FLAG_INTERLACE: mode is interlaced.
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+ * - DRM_MODE_FLAG_DBLSCAN: mode uses doublescan.
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+ * - DRM_MODE_FLAG_CSYNC: mode uses composite sync.
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+ * - DRM_MODE_FLAG_PCSYNC: composite sync is active high.
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+ * - DRM_MODE_FLAG_NCSYNC: composite sync is active low.
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+ * - DRM_MODE_FLAG_HSKEW: hskew provided (not used?).
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+ * - DRM_MODE_FLAG_BCAST: not used?
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+ * - DRM_MODE_FLAG_PIXMUX: not used?
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+ * - DRM_MODE_FLAG_DBLCLK: double-clocked mode.
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+ * - DRM_MODE_FLAG_CLKDIV2: half-clocked mode.
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+ *
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+ * Additionally there's flags to specify how 3D modes are packed:
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+ *
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+ * - DRM_MODE_FLAG_3D_NONE: normal, non-3D mode.
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+ * - DRM_MODE_FLAG_3D_FRAME_PACKING: 2 full frames for left and right.
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+ * - DRM_MODE_FLAG_3D_FIELD_ALTERNATIVE: interleaved like fields.
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+ * - DRM_MODE_FLAG_3D_LINE_ALTERNATIVE: interleaved lines.
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+ * - DRM_MODE_FLAG_3D_SIDE_BY_SIDE_FULL: side-by-side full frames.
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+ * - DRM_MODE_FLAG_3D_L_DEPTH: ?
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+ * - DRM_MODE_FLAG_3D_L_DEPTH_GFX_GFX_DEPTH: ?
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+ * - DRM_MODE_FLAG_3D_TOP_AND_BOTTOM: frame split into top and bottom
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+ * parts.
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+ * - DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF: frame split into left and
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+ * right parts.
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+ */
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unsigned int flags;
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- /* Addressable image size (may be 0 for projectors, etc.) */
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+ /**
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+ * @width_mm:
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+ *
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+ * Addressable size of the output in mm, projectors should set this to
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+ * 0.
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+ */
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int width_mm;
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+
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+ /**
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+ * @height_mm:
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+ *
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+ * Addressable size of the output in mm, projectors should set this to
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+ * 0.
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+ */
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int height_mm;
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- /* Actual mode we give to hw */
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- int crtc_clock; /* in KHz */
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+ /**
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+ * @crtc_clock:
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+ *
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+ * Actual pixel or dot clock in the hardware. This differs from the
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+ * logical @clock when e.g. using interlacing, double-clocking, stereo
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+ * modes or other fancy stuff that changes the timings and signals
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+ * actually sent over the wire.
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+ *
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+ * This is again in kHz.
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+ *
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+ * Note that with digital outputs like HDMI or DP there's usually a
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+ * massive confusion between the dot clock and the signal clock at the
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+ * bit encoding level. Especially when a 8b/10b encoding is used and the
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+ * difference is exactly a factor of 10.
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+ */
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+ int crtc_clock;
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int crtc_hdisplay;
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int crtc_hblank_start;
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int crtc_hblank_end;
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@@ -140,12 +353,48 @@ struct drm_display_mode {
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int crtc_vsync_end;
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int crtc_vtotal;
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- /* Driver private mode info */
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+ /**
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+ * @private:
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+ *
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+ * Pointer for driver private data. This can only be used for mode
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+ * objects passed to drivers in modeset operations. It shouldn't be used
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+ * by atomic drivers since they can store any additional data by
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+ * subclassing state structures.
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+ */
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int *private;
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+
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+ /**
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+ * @private_flags:
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+ *
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+ * Similar to @private, but just an integer.
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+ */
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int private_flags;
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- int vrefresh; /* in Hz */
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- int hsync; /* in kHz */
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+ /**
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+ * @vrefresh:
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+ *
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+ * Vertical refresh rate, for debug output in human readable form. Not
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+ * used in a functional way.
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+ *
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+ * This value is in Hz.
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+ */
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+ int vrefresh;
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+
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+ /**
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+ * @hsync:
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+ *
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+ * Horizontal refresh rate, for debug output in human readable form. Not
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+ * used in a functional way.
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+ *
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+ * This value is in kHz.
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+ */
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+ int hsync;
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+
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+ /**
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+ * @picture_aspect_ratio:
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+ *
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+ * Field for setting the HDMI picture aspect ratio of a mode.
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+ */
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enum hdmi_picture_aspect picture_aspect_ratio;
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};
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Daniel Vetter