target/linux/mediatek/patches-5.15/120-05-v5.18-spi-spi-mem-Check-the-controller-extra-capabilities.patch

   1 From c9cae7e1e5c87d0aa76b7bededa5191a0c8cf25a Mon Sep 17 00:00:00 2001
   2 From: Miquel Raynal <miquel.raynal@bootlin.com>
   3 Date: Thu, 27 Jan 2022 10:17:57 +0100
   4 Subject: [PATCH 05/15] spi: spi-mem: Check the controller extra capabilities
   5
   6 Controllers can now provide a spi-mem capabilities structure. Let's make
   7 use of it in spi_mem_controller_default_supports_op(). As we want to
   8 check for DTR operations as well as normal operations in a single
   9 helper, let's pull the necessary checks from spi_mem_dtr_supports_op()
  10 for now.
  11
  12 However, because no controller provide these extra capabilities, this
  13 change has no effect so far.
  14
  15 Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
  16 Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
  17 Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
  18 Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
  19 Link: https://lore.kernel.org/linux-mtd/20220127091808.1043392-3-miquel.raynal@bootlin.com
  20 (cherry picked from commit cb7e96ee81edaa48c67d84c14df2cbe464391c37)
  21 ---
  22  drivers/spi/spi-mem.c | 17 +++++++++++++----
  23  1 file changed, 13 insertions(+), 4 deletions(-)
  24
  25 --- a/drivers/spi/spi-mem.c
  26 +++ b/drivers/spi/spi-mem.c
  27 @@ -173,11 +173,20 @@ EXPORT_SYMBOL_GPL(spi_mem_dtr_supports_o
  28  bool spi_mem_default_supports_op(struct spi_mem *mem,
  29                                  const struct spi_mem_op *op)
  30  {
  31 -       if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr)
  32 -               return false;
  33 +       struct spi_controller *ctlr = mem->spi->controller;
  34 +       bool op_is_dtr =
  35 +               op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr;
  36
  37 -       if (op->cmd.nbytes != 1)
  38 -               return false;
  39 +       if (op_is_dtr) {
  40 +               if (!spi_mem_controller_is_capable(ctlr, dtr))
  41 +                       return false;
  42 +
  43 +               if (op->cmd.nbytes != 2)
  44 +                       return false;
  45 +       } else {
  46 +               if (op->cmd.nbytes != 1)
  47 +                       return false;
  48 +       }
  49
  50         return spi_mem_check_buswidth(mem, op);
  51  }