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[linux,dev-5.7,v2,2/7] spi: fsi: Fix clock running too fast

Message ID 20200730220330.16368-3-eajames@linux.ibm.com
State Not Applicable, archived
Headers show
Series spi: Fix FSI-attached controller and AT25 drivers | expand

Commit Message

Eddie James July 30, 2020, 10:03 p.m. UTC 
From: Brad Bishop <bradleyb@fuzziesquirrel.com>

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 <bradleyb@fuzziesquirrel.com>
Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/spi/spi-fsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

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 {