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spi: atmel-quadspi: fix resume call 

When waking up from the Suspend-to-RAM state, the following error
was seen:

m25p80 spi2.0: flash operation timed out

The flash remained in an undefined state, returning 0xFFs.
Fix it by setting the Serial Clock Baud Rate, as it was set
before the conversion to SPIMEM.

Tested with sama5d2_xplained and mx25l25673g spi-nor in
Backup + Self-Refresh and Suspend modes.

Fixes: 0e6aae08e9 ("spi: Add QuadSPI driver for Atmel SAMA5D2")
Reported-by: Mark Deneen <mdeneen@gmail.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Tudor Ambarus 2019-06-28 15:30:34 +00:00 committed by Mark Brown
parent 5b74e9a306
commit ab73561140
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 7 additions and 3 deletions
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10
drivers/spi/atmel-quadspi.c
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@ -151,6 +151,7 @@ struct atmel_qspi {
const struct atmel_qspi_caps *caps;
u32 pending;
u32 mr;
u32 scr;
struct completion cmd_completion;
};
@ -382,7 +383,7 @@ static int atmel_qspi_setup(struct spi_device *spi)
struct spi_controller *ctrl = spi->master;
struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
unsigned long src_rate;
u32 scr, scbr;
u32 scbr;
if (ctrl->busy)
return -EBUSY;
@ -399,8 +400,8 @@ static int atmel_qspi_setup(struct spi_device *spi)
if (scbr > 0)
scbr--;
scr = QSPI_SCR_SCBR(scbr);
writel_relaxed(scr, aq->regs + QSPI_SCR);
aq->scr = QSPI_SCR_SCBR(scbr);
writel_relaxed(aq->scr, aq->regs + QSPI_SCR);
return 0;
}
@ -584,6 +585,9 @@ static int __maybe_unused atmel_qspi_resume(struct device *dev)
clk_prepare_enable(aq->qspick);
atmel_qspi_init(aq);
writel_relaxed(aq->scr, aq->regs + QSPI_SCR);
return 0;
}