From: Angelo Dureghello adureghello@baylibre.com
[ Upstream commit 21889245fb538123ac9968eea0018f878b44c8c8 ]
Use "instruction" mode over initial configuration and all other non-streaming operations.
DAC boots in streaming mode as default, and the driver is not changing this mode.
Instruction r/w is still working because instruction is processed from the DAC after chip select is deasserted, this works until loop mode is 0 or greater than the instruction size.
All initial operations should be more safely done in instruction mode, a mode provided for this.
Signed-off-by: Angelo Dureghello adureghello@baylibre.com Link: https://patch.msgid.link/20250114-wip-bl-ad3552r-axi-v0-iio-testing-carlos-v... Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iio/dac/ad3552r-hs.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/dac/ad3552r-hs.c b/drivers/iio/dac/ad3552r-hs.c index 8974df6256708..67957fc21696a 100644 --- a/drivers/iio/dac/ad3552r-hs.c +++ b/drivers/iio/dac/ad3552r-hs.c @@ -137,13 +137,20 @@ static int ad3552r_hs_buffer_postenable(struct iio_dev *indio_dev) if (ret) return ret;
+ /* Primary region access, set streaming mode (now in SPI + SDR). */ + ret = ad3552r_qspi_update_reg_bits(st, + AD3552R_REG_ADDR_INTERFACE_CONFIG_B, + AD3552R_MASK_SINGLE_INST, 0, 1); + if (ret) + return ret; + /* Inform DAC chip to switch into DDR mode */ ret = ad3552r_qspi_update_reg_bits(st, AD3552R_REG_ADDR_INTERFACE_CONFIG_D, AD3552R_MASK_SPI_CONFIG_DDR, AD3552R_MASK_SPI_CONFIG_DDR, 1); if (ret) - return ret; + goto exit_err_ddr;
/* Inform DAC IP to go for DDR mode from now on */ ret = iio_backend_ddr_enable(st->back); @@ -174,6 +181,11 @@ static int ad3552r_hs_buffer_postenable(struct iio_dev *indio_dev)
iio_backend_ddr_disable(st->back);
+exit_err_ddr: + ad3552r_qspi_update_reg_bits(st, AD3552R_REG_ADDR_INTERFACE_CONFIG_B, + AD3552R_MASK_SINGLE_INST, + AD3552R_MASK_SINGLE_INST, 1); + return ret; }
@@ -198,6 +210,14 @@ static int ad3552r_hs_buffer_predisable(struct iio_dev *indio_dev) if (ret) return ret;
+ /* Back to single instruction mode, disabling loop. */ + ret = ad3552r_qspi_update_reg_bits(st, + AD3552R_REG_ADDR_INTERFACE_CONFIG_B, + AD3552R_MASK_SINGLE_INST, + AD3552R_MASK_SINGLE_INST, 1); + if (ret) + return ret; + return 0; }
@@ -308,6 +328,13 @@ static int ad3552r_hs_setup(struct ad3552r_hs_state *st) if (ret) return ret;
+ ret = st->data->bus_reg_write(st->back, + AD3552R_REG_ADDR_INTERFACE_CONFIG_B, + AD3552R_MASK_SINGLE_INST | + AD3552R_MASK_SHORT_INSTRUCTION, 1); + if (ret) + return ret; + ret = ad3552r_hs_scratch_pad_test(st); if (ret) return ret;