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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org cqspi_configure() only reprogrammed per-device CS timing (CQSPI_REG_DELAY) and the non-PHY read-capture register when the clock frequency changed, not when the chip-select changed. 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. Signed-off-by: Santhosh Kumar K --- drivers/spi/spi-cadence-quadspi.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c index 542ad331ff16..8bf3a5a8bf43 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -1570,10 +1570,19 @@ 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 (switch_cs || switch_ck) { cqspi_delay(f_pdata); cqspi_readdata_capture(cqspi, !cqspi->rclk_en, false, f_pdata->read_delay); -- 2.34.1 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/