| Message ID | 20221212180732.79167-13-sudip.mukherjee@sifive.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add support for enhanced SPI for Designware SPI controllers | expand |
On Mon, Dec 12, 2022 at 06:07:29PM +0000, Sudip Mukherjee wrote: > If the connection to the spi device is not stable then the transfer can > fail. Add retry for DW_SPI_WAIT_RETRIES times and print error if it still > fails. > > Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com> > --- > drivers/spi/spi-dw-core.c | 17 ++++++++++++++++- > 1 file changed, 16 insertions(+), 1 deletion(-) > > diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c > index dff7b419af304..cef56acd8d8fd 100644 > --- a/drivers/spi/spi-dw-core.c > +++ b/drivers/spi/spi-dw-core.c > @@ -906,7 +906,7 @@ static void dw_spi_enh_write_cmd_addr(struct dw_spi *dws, const struct spi_mem_o > } > } > > -static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) > +static int dw_spi_try_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) > { > struct spi_controller *ctlr = mem->spi->controller; > struct dw_spi *dws = spi_controller_get_devdata(ctlr); > @@ -991,6 +991,21 @@ static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op * > return ret; > } > > +static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) > +{ > + struct spi_controller *ctlr = mem->spi->controller; > + struct dw_spi *dws = spi_controller_get_devdata(ctlr); > + int retry, ret = -EIO; > + > + for (retry = 0; retry < DW_SPI_WAIT_RETRIES && ret != 0; retry++) > + ret = dw_spi_try_enh_mem_op(mem, op); > + > + if (retry == DW_SPI_WAIT_RETRIES) > + dev_err(&dws->master->dev, "Retry of enh_mem_op failed\n"); > + > + return ret; No. If something goes wrong during the transfer you should return an error and let the upper layer to decide whether to retry or pass the failure further. -Serge(y) > +} > + > /* > * Initialize the default memory operations if a glue layer hasn't specified > * custom ones. Direct mapping operations will be preserved anyway since DW SPI > -- > 2.30.2 >
diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c index dff7b419af304..cef56acd8d8fd 100644 --- a/drivers/spi/spi-dw-core.c +++ b/drivers/spi/spi-dw-core.c @@ -906,7 +906,7 @@ static void dw_spi_enh_write_cmd_addr(struct dw_spi *dws, const struct spi_mem_o } } -static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) +static int dw_spi_try_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) { struct spi_controller *ctlr = mem->spi->controller; struct dw_spi *dws = spi_controller_get_devdata(ctlr); @@ -991,6 +991,21 @@ static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op * return ret; } +static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct spi_controller *ctlr = mem->spi->controller; + struct dw_spi *dws = spi_controller_get_devdata(ctlr); + int retry, ret = -EIO; + + for (retry = 0; retry < DW_SPI_WAIT_RETRIES && ret != 0; retry++) + ret = dw_spi_try_enh_mem_op(mem, op); + + if (retry == DW_SPI_WAIT_RETRIES) + dev_err(&dws->master->dev, "Retry of enh_mem_op failed\n"); + + return ret; +} + /* * Initialize the default memory operations if a glue layer hasn't specified * custom ones. Direct mapping operations will be preserved anyway since DW SPI
If the connection to the spi device is not stable then the transfer can fail. Add retry for DW_SPI_WAIT_RETRIES times and print error if it still fails. Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com> --- drivers/spi/spi-dw-core.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-)