SPRZ397K November   2012  – September 2024 TDA2EG-17 , TDA2HF , TDA2HG , TDA2HV , TDA2LF , TDA2SA , TDA2SG , TDA2SX

 

  1.   1
  2. 1Introduction
    1.     Related Documentation
    2.     Trademarks
    3.     Modules Impacted
  3. 2Silicon Advisories
    1.     Revisions SR 2.0, 1.1, 1.0 - Advisories List
    2.     i202
    3.     i378
    4.     i631
    5.     i694
    6.     i698
    7.     i699
    8.     i727
    9.     i729
    10.     i734
    11.     i767
    12.     i782
    13.     i783
    14.     i802
    15.     i803
    16.     i807
    17.     i808
    18.     i809
    19.     i810
    20.     i813
    21.     i814
    22.     i815
    23.     i818
    24.     i819
    25.     i820
    26.     i824
    27.     i826
    28.     i829
    29.     i834
    30.     i837
    31.     i840
    32.     i841
    33.     i842
    34.     i843
    35.     i847
    36.     i849
    37.     i852
    38.     i854
    39.     i855
    40.     i856
    41.     i859
    42.     i861
    43.     i862
    44.     i863
    45.     i868
    46.     i869
    47.     i870
    48.     i871
    49.     i872
    50.     i874
    51.     i875
    52.     i878
    53.     i879
    54.     i880
    55.     i882
    56.     i883
    57.     i884
    58.     i887
    59.     i889
    60.     i890
    61.     i893
    62.     i895
    63.     i896
    64.     i897
    65.     i898
    66.     i899
    67.     i900
    68.     i901
    69.     i903
    70.     i916
    71.     i927
    72.     i929
    73.     i930
    74.     i932
    75.     i933
    76.     i936
    77.     i940
    78.     i2446
  4. 3Silicon Limitations
    1.     Revisions SR 2.0, 1.1, 1.0 - Limitations List
    2.     i596
    3.     i641
    4.     i833
    5.     i838
    6.     i844
    7.     i845
    8.     i848
    9.     i850
    10.     i851
    11.     i853
    12.     i857
    13.     i858
    14.     i876
    15.     i877
    16.     i892
    17.     i909
  5. 4Silicon Cautions
    1.     Revisions SR 2.0, 1.1, 1.0 - Cautions List
    2.     i781
    3. 4.1 106
    4.     i827
    5.     i832
    6.     i836
    7.     i839
    8.     i864
    9.     i885
    10.     i886
    11.     i912
    12.     i926
    13.     i931
    14.     i935
  6. 5Revision History

i829

Reusing Pipe Connected to Writeback Pipeline On-the-Fly to an Active Panel

CRITICALITY

Low

DESCRIPTION

Any pipe connected to writeback (WB) in memory-to-memory (m2m) mode (DISPC_WB_ATTRIBUTES[19] WRITEBACKMODE=0x1) cannot be connected on the fly to an active panel when m2m operation is complete. Trying to attempt this will cause sync-lost interrupt and one corrupted frame.

When a pipe is connected to WB pipeline in m2m mode, after m2m operation, it remains enabled. The HW does not disable the pipeline by clearing the enable bit associated with this pipeline (DISPC_VID1/2/3_ATTRIBUTES[0] ENABLE=0x0), though it disables the writeback by clearing the WB pipeline enable bit (DISPC_WB_ATTRIBUTES[0] ENABLE=0x0). If this pipe is then connected to an active panel, the connection will not be synchronized to a frame start. This will result in current frame getting corrupted and sync-lost.

WORKAROUND

The SW should use following exit sequence from m2m operation:

  1. When m2m operation is completed and hardware is automatically disabled writeback by setting DISPC_WB_ATTRIBUTES[0]ENABLE bit to 0x0, SW should disable the pipe connected to WB in m2m mode: DISPC_VID1/2/3_ATTRIBUTES[0] ENABLE = 0x0;
  2. Writeback should be re-enabled (DISPC_WB_ATTRIBUTES[0]ENABLE=0x1) and after that disabled by SW (DISPC_WB_ATTRIBUTES[0] ENABLE = 0x0);
  3. The direction of the pipe to the active panel should be changed and all new programming for the pipe should be made;
  4. Pipe is enabled again (DISPC_VID1/2/3_ATTRIBUTES[0] ENABLE = 0x1) at the end,

REVISIONS IMPACTED

SR 2.0, 1.1, 1.0

TDA2x: 2.0, 1.1, 1.0

DRA75x, DRA74x: 2.0, 1.1, 1.0

AM572x: 2.0, 1.1