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In a multi-device setup where both devices operate at the same frequency, a CS switch leaves the previous device's timing parameters in hardware. Split the update condition: baud rate divisor is updated on clock change only (it is frequency-derived), but the per-device delay and read-capture registers are now updated on any CS or clock switch. Tested-by: Srikanth Boyapally Tested-by: Moteen Shah Reviewed-by: Moteen Shah Signed-off-by: Santhosh Kumar K --- drivers/spi/spi-cadence-quadspi.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c index 806bf49e814d..12714a9f04f3 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -1620,8 +1620,9 @@ static void cqspi_configure(struct cqspi_flash_pdata *f_pdata, struct cqspi_st *cqspi = f_pdata->cqspi; int switch_cs = (cqspi->current_cs != f_pdata->cs); int switch_ck = (cqspi->sclk != sclk); + bool reconfigure = switch_cs || switch_ck; - if (switch_cs || switch_ck) + if (reconfigure) cqspi_controller_enable(cqspi, 0); /* Switch chip select. */ @@ -1630,17 +1631,26 @@ static void cqspi_configure(struct cqspi_flash_pdata *f_pdata, cqspi_chipselect(f_pdata); } - /* Setup baudrate divisor and delays */ + /* Update baudrate only on clock change. */ if (switch_ck) { cqspi->sclk = sclk; cqspi_config_baudrate_div(cqspi); + } + + /* + * Reprogram per-device CS timing and non-PHY read capture on any + * chip-select or clock switch. Without this, two devices at the same + * frequency would each see the other's timing parameters after a CS + * switch, since the lazy clock-only check would never trigger. + */ + if (reconfigure) { cqspi_delay(f_pdata); if (!cqspi->phy_tuning_active) cqspi_readdata_capture(cqspi, !cqspi->rclk_en, false, f_pdata->read_delay); } - if (switch_cs || switch_ck) + if (reconfigure) cqspi_controller_enable(cqspi, 1); } -- 2.34.1