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drm: Implement timings adjustments for frame packing

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When using the frame packing and a single big framebuffer, some hardware
requires that we do everything like if we were scanning out the big
buffer itself. Let's instrument drm_mode_set_crtcinfo() to be able to do
this adjustement if the driver is asking for it.

v2: Use crtc_vtotal and multiply the clock by 2 instead of
    reconstructing it (Ville Syrjälä)

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2013-09-25 16:45:35 +01:00 committed by Daniel Vetter
parent bde2dcf701
commit 448cce25f4
2 changed files with 23 additions and 2 deletions
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22
drivers/gpu/drm/drm_modes.c
View File

@ -707,12 +707,18 @@ EXPORT_SYMBOL(drm_mode_vrefresh);
/**
* drm_mode_set_crtcinfo - set CRTC modesetting parameters
* @p: mode
* @adjust_flags: unused? (FIXME)
* @adjust_flags: a combination of adjustment flags
*
* LOCKING:
* None.
*
* Setup the CRTC modesetting parameters for @p, adjusting if necessary.
*
* - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
* interlaced modes.
* - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
* buffers containing two eyes (only adjust the timings when needed, eg. for
* "frame packing" or "side by side full").
*/
void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
{
@ -753,6 +759,20 @@ void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
p->crtc_vtotal *= p->vscan;
}
if (adjust_flags & CRTC_STEREO_DOUBLE) {
unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
switch (layout) {
case DRM_MODE_FLAG_3D_FRAME_PACKING:
p->crtc_clock *= 2;
p->crtc_vdisplay += p->crtc_vtotal;
p->crtc_vsync_start += p->crtc_vtotal;
p->crtc_vsync_end += p->crtc_vtotal;
p->crtc_vtotal += p->crtc_vtotal;
break;
}
}
p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);

3
include/drm/drm_crtc.h
View File

@ -125,7 +125,8 @@ enum drm_mode_status {
.vscan = (vs), .flags = (f), \
.base.type = DRM_MODE_OBJECT_MODE
#define CRTC_INTERLACE_HALVE_V 0x1 /* halve V values for interlacing */
#define CRTC_INTERLACE_HALVE_V (1 << 0) /* halve V values for interlacing */
#define CRTC_STEREO_DOUBLE (1 << 1) /* adjust timings for stereo modes */
struct drm_display_mode {
/* Header */