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SMM is set in exec_op() and not at probe time, to let room for future regular SPI support. Signed-off-by: Tudor Ambarus --- v3: update smm value when different. rename mr/smm v2: cache MR value instead of moving the write access at probe drivers/spi/atmel-quadspi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c index ddc712410812..645284c6ec9a 100644 --- a/drivers/spi/atmel-quadspi.c +++ b/drivers/spi/atmel-quadspi.c @@ -155,6 +155,7 @@ struct atmel_qspi { struct clk *clk; struct platform_device *pdev; u32 pending; + u32 smm; struct completion cmd_completion; }; @@ -238,7 +239,11 @@ static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) icr = QSPI_ICR_INST(op->cmd.opcode); ifr = QSPI_IFR_INSTEN; - qspi_writel(aq, QSPI_MR, QSPI_MR_SMM); + /* Set the QSPI controller in Serial Memory Mode */ + if (aq->smm != QSPI_MR_SMM) { + qspi_writel(aq, QSPI_MR, QSPI_MR_SMM); + aq->smm = QSPI_MR_SMM; + } mode = find_mode(op); if (mode < 0)