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drm: rcar-du: Fix Alpha blending issue on Gen3

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As per R-Car-Gen3_Common_OPC_Customer_Notifications_V30.1.pdf,
unexpected image output(such as incorrect colors or planes being
invisible) can happen on the below conditions, as PnALPHAR register
is not initialized by reset.

When alpha blending (PpMRm.PpSPIM=0b101) is performed and:
	•two Planes are enabled on any DUn (n=0,1,2,3)
		oDSPRn= 0x0000 0031 or 0x0000 0013
	•or DU0 and DU1 is used for display at the same time
		oDSPR0= 0x0000 0001 and DSPR1= 0x0000 0003
		oDSPR0= 0x0000 0003 and DSPR1= 0x0000 0001
	•or DU2 and DU3(H3 Only) is used for display at the same time
		oDSPR2= 0x0000 0001 and DSPR3= 0x0000 0003
		oDSPR2= 0x0000 0003 and DSPR3= 0x0000 0001

This patch set PnALPHAR register to 0 to avoid this issue.

Signed-off-by: LUU HOAI <hoai.luu.ub@renesas.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
LUU HOAI 2022-04-26 09:41:57 +01:00 committed by Laurent Pinchart
parent 3e7f74dcfb
commit b7aaa61726
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/rcar-du/rcar_du_plane.c
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@ -512,6 +512,18 @@ static void rcar_du_plane_setup_format_gen3(struct rcar_du_group *rgrp,
rcar_du_plane_write(rgrp, index, PnDDCR4,
state->format->edf | PnDDCR4_CODE);
/*
* On Gen3, some DU channels have two planes, each being wired to a
* separate VSPD instance. The DU can then blend two planes. While
* this feature isn't used by the driver, issues related to alpha
* blending (such as incorrect colors or planes being invisible) may
* still occur if the PnALPHAR register has a stale value. Set the
* register to 0 to avoid this.
*/
/* TODO: Check if alpha-blending should be disabled in PnMR. */
rcar_du_plane_write(rgrp, index, PnALPHAR, 0);
}
static void rcar_du_plane_setup_format(struct rcar_du_group *rgrp,