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| author | LUU HOAI <hoai.luu.ub@renesas.com> | 2022-04-26 09:41:57 +0100 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2022-07-07 05:24:36 +0300 |
| commit | b7aaa61726cbc7b941007af14a9f991a828c67e4 (patch) | |
| tree | ab2ea8622e0d2d2eb8672d60a76c7ca616385b97 /drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c | |
| parent | 3e7f74dcfb7233ba3f8b3879066fdd3e79f2f701 (diff) | |
drm: rcar-du: Fix Alpha blending issue on Gen3
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>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c')
0 files changed, 0 insertions, 0 deletions