[PATCH 2/7] spi: fsi: Fix clock running too fast
From: Eddie James <eajames@linux.ibm.com>
Date: 2020-08-20 17:07:00
Also in:
linux-spi, lkml
Subsystem:
fsi-attached spi driver, spi subsystem, the rest · Maintainers:
Eddie James, Mark Brown, Linus Torvalds
From: Brad Bishop <redacted> Use a clock divider tuned to a 200MHz FSI clock. Use of the previous divider at 200MHz results in corrupt data from endpoint devices. Ideally the clock divider would be calculated from the FSI clock, but that would require some significant work on the FSI driver. Signed-off-by: Brad Bishop <redacted> Signed-off-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> --- drivers/spi/spi-fsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/spi/spi-fsi.c b/drivers/spi/spi-fsi.c
index 8f64af0140e0..559d0ff981f3 100644
--- a/drivers/spi/spi-fsi.c
+++ b/drivers/spi/spi-fsi.c@@ -350,7 +350,7 @@ static int fsi_spi_transfer_init(struct fsi_spi *ctx) u64 status = 0ULL; u64 wanted_clock_cfg = SPI_FSI_CLOCK_CFG_ECC_DISABLE | SPI_FSI_CLOCK_CFG_SCK_NO_DEL | - FIELD_PREP(SPI_FSI_CLOCK_CFG_SCK_DIV, 4); + FIELD_PREP(SPI_FSI_CLOCK_CFG_SCK_DIV, 19); end = jiffies + msecs_to_jiffies(SPI_FSI_INIT_TIMEOUT_MS); do {
--
2.26.2