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drm: rcar-du: Reject modes that fail CRTC timing requirements

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The hardware requires the HDSR and VDSR registers to be set to 1 or
higher. This translates to a minimum combined horizontal sync and back
porch of 20 pixels and a minimum vertical back porch of 3 lines. Reject
modes that fail those requirements.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2018-11-11 04:15:08 +02:00
parent 63a298f22a
commit 256856efb8
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/rcar-du/rcar_du_crtc.c
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@ -735,10 +735,22 @@ enum drm_mode_status rcar_du_crtc_mode_valid(struct drm_crtc *crtc,
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
struct rcar_du_device *rcdu = rcrtc->group->dev;
bool interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE;
unsigned int vbp;
if (interlaced && !rcar_du_has(rcdu, RCAR_DU_FEATURE_INTERLACED))
return MODE_NO_INTERLACE;
/*
* The hardware requires a minimum combined horizontal sync and back
* porch of 20 pixels and a minimum vertical back porch of 3 lines.
*/
if (mode->htotal - mode->hsync_start < 20)
return MODE_HBLANK_NARROW;
vbp = (mode->vtotal - mode->vsync_end) / (interlaced ? 2 : 1);
if (vbp < 3)
return MODE_VBLANK_NARROW;
return MODE_OK;
}