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   1 From: Florian Fainelli <f.fainelli@gmail.com>
   2 Subject: [PATCH v3 8/9] mtd: rawnand: brcmnand: BCMA controller uses command shift of 0
   3 Date: Fri, 07 Jan 2022 10:46:13 -0800
   4 Content-Type: text/plain; charset="utf-8"
   5
   6 For some odd and unexplained reason the BCMA NAND controller, albeit
   7 revision 3.4 uses a command shift of 0 instead of 24 as it should be,
   8 quirk that.
   9
  10 Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
  11 ---
  12  drivers/mtd/nand/raw/brcmnand/brcmnand.c | 6 ++++++
  13  1 file changed, 6 insertions(+)
  14
  15 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
  16 +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
  17 @@ -913,6 +913,12 @@ static void brcmnand_wr_corr_thresh(stru
  18
  19  static inline int brcmnand_cmd_shift(struct brcmnand_controller *ctrl)
  20  {
  21 +       /* Kludge for the BCMA-based NAND controller which does not actually
  22 +        * shift the command
  23 +        */
  24 +       if (ctrl->nand_version == 0x0304 && brcmnand_non_mmio_ops(ctrl))
  25 +               return 0;
  26 +
  27         if (ctrl->nand_version < 0x0602)
  28                 return 24;
  29         return 0;