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drm: rcar-du: Extend CMM HDSE documentation

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When the CMM is enabled, the HDSE offset is further adjusted to
compensate for consumed pixels.

Explain this further, with an extra comment at the point the offset is
adjusted.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Kieran Bingham 2022-04-09 19:57:06 +01:00 committed by Laurent Pinchart
parent f929217499
commit 5278027b3d
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/rcar-du/rcar_du_crtc.c
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@ -300,6 +300,11 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
| DSMR_DIPM_DISP | DSMR_CSPM;
rcar_du_crtc_write(rcrtc, DSMR, dsmr);
/*
* When the CMM is enabled, an additional offset of 25 pixels must be
* subtracted from the HDS (horizontal display start) and HDE
* (horizontal display end) registers.
*/
hdse_offset = 19;
if (rcrtc->group->cmms_mask & BIT(rcrtc->index % 2))
hdse_offset += 25;