| Message ID | 20190204100910.26701-2-tudor.ambarus@microchip.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | spi: atmel-quadspi: introduce sam9x60 qspi controller | expand |
On Mon, 4 Feb 2019 10:09:22 +0000 <Tudor.Ambarus@microchip.com> wrote: > From: Tudor Ambarus <tudor.ambarus@microchip.com> > > Set the controller by default in Serial Memory Mode (SMM) at probe. > Cache Mode Register (MR) value to avoid write access when setting > the controller in serial memory mode at exec_op(). > > Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Reviewed-by: Boris Brezillon <bbrezillon@kernel.org> > --- > v4: s/smm/mr, init controller in serial memory mode by default > 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 | 14 +++++++++++++- > 1 file changed, 13 insertions(+), 1 deletion(-) > > diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c > index ddc712410812..d6864d29f294 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 mr; > struct completion cmd_completion; > }; > > @@ -238,7 +239,14 @@ 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); > + /* > + * If the QSPI controller is set in regular SPI mode, set it in > + * Serial Memory Mode (SMM). > + */ > + if (aq->mr != QSPI_MR_SMM) { > + qspi_writel(aq, QSPI_MR, QSPI_MR_SMM); > + aq->mr = QSPI_MR_SMM; > + } > > mode = find_mode(op); > if (mode < 0) > @@ -381,6 +389,10 @@ static int atmel_qspi_init(struct atmel_qspi *aq) > /* Reset the QSPI controller */ > qspi_writel(aq, QSPI_CR, QSPI_CR_SWRST); > > + /* Set the QSPI controller by default in Serial Memory Mode */ > + qspi_writel(aq, QSPI_MR, QSPI_MR_SMM); > + aq->mr = QSPI_MR_SMM; > + > /* Enable the QSPI controller */ > qspi_writel(aq, QSPI_CR, QSPI_CR_QSPIEN); >
diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c index ddc712410812..d6864d29f294 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 mr; struct completion cmd_completion; }; @@ -238,7 +239,14 @@ 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); + /* + * If the QSPI controller is set in regular SPI mode, set it in + * Serial Memory Mode (SMM). + */ + if (aq->mr != QSPI_MR_SMM) { + qspi_writel(aq, QSPI_MR, QSPI_MR_SMM); + aq->mr = QSPI_MR_SMM; + } mode = find_mode(op); if (mode < 0) @@ -381,6 +389,10 @@ static int atmel_qspi_init(struct atmel_qspi *aq) /* Reset the QSPI controller */ qspi_writel(aq, QSPI_CR, QSPI_CR_SWRST); + /* Set the QSPI controller by default in Serial Memory Mode */ + qspi_writel(aq, QSPI_MR, QSPI_MR_SMM); + aq->mr = QSPI_MR_SMM; + /* Enable the QSPI controller */ qspi_writel(aq, QSPI_CR, QSPI_CR_QSPIEN);