spi: spi-mem: Add an ecc parameter to the spi_mem_op structure

Soon the SPI-NAND core will need a way to request a SPI controller to
enable ECC support for a given operation. This is because of the
pipelined integration of certain ECC engines, which are directly managed
by the SPI controller itself.

Introduce a spi_mem_op additional field for this purpose: ecc.

So far this field is left unset and checked to be false by all
the SPI controller drivers in their ->supports_op() hook, as they all
call spi_mem_default_supports_op().

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/linux-mtd/20220127091808.1043392-7-miquel.raynal@bootlin.com

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index ed966d8129eb06dcf5e0057f80fac9ff5957e952..f38ac31961c98bcef810472643db3cc41a73e430 100644 (file)
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -178,6 +178,11 @@ bool spi_mem_default_supports_op(struct spi_mem *mem,
                        return false;
        }
 
+       if (op->data.ecc) {
+               if (!spi_mem_controller_is_capable(ctlr, ecc))
+                       return false;
+       }
+
        return spi_mem_check_buswidth(mem, op);
 }
 EXPORT_SYMBOL_GPL(spi_mem_default_supports_op);

diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
index 4a1bfe689872b017a7d6110c177f63bec4017eed..2ba044d0d5e5b984477248e5bafbc62475b8e109 100644 (file)
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -89,6 +89,7 @@ enum spi_mem_data_dir {
  * @dummy.dtr: whether the dummy bytes should be sent in DTR mode or not
  * @data.buswidth: number of IO lanes used to send/receive the data
  * @data.dtr: whether the data should be sent in DTR mode or not
+ * @data.ecc: whether error correction is required or not
  * @data.dir: direction of the transfer
  * @data.nbytes: number of data bytes to send/receive. Can be zero if the
  *              operation does not involve transferring data
@@ -119,6 +120,7 @@ struct spi_mem_op {
        struct {
                u8 buswidth;
                u8 dtr : 1;
+               u8 ecc : 1;
                enum spi_mem_data_dir dir;
                unsigned int nbytes;
                union {
@@ -288,9 +290,11 @@ struct spi_controller_mem_ops {
 /**
  * struct spi_controller_mem_caps - SPI memory controller capabilities
  * @dtr: Supports DTR operations
+ * @ecc: Supports operations with error correction
  */
 struct spi_controller_mem_caps {
        bool dtr;
+       bool ecc;
 };
 
 #define spi_mem_controller_is_capable(ctlr, cap)       \