Commit 448cce25 authored by Damien Lespiau's avatar Damien Lespiau Committed by Daniel Vetter
Browse files

drm: Implement timings adjustments for frame packing 



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: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDamien Lespiau <damien.lespiau@intel.com>
Acked-by: default avatarDave Airlie <airlied@gmail.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent bde2dcf7

drivers/gpu/drm/drm_modes.c

+21 −1
Original line number Diff line number Diff line
@@ -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);

include/drm/drm_crtc.h

+2 −1
Original line number Diff line number Diff line
@@ -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 */

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