Add dummy readl after invalidating cmd field of QSPI_CMD_REG to ensure bus sync. Without this device's CS is not deactivated reliably leading to failure to enumerate flash or failure to set quad enable bit on Macronix flash present on am437x-sk and am437x-idk evms.
Signed-off-by: Vignesh R vigneshr@ti.com --- drivers/spi/ti_qspi.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c index bd63db8a2acc..ba2da017c21a 100644 --- a/drivers/spi/ti_qspi.c +++ b/drivers/spi/ti_qspi.c @@ -170,6 +170,8 @@ void spi_cs_deactivate(struct spi_slave *slave) debug("spi_cs_deactivate: 0x%08x\n", (u32)slave);
writel(qslave->cmd | QSPI_INVAL, &qslave->base->cmd); + /* dummy readl to ensure bus sync */ + readl(&qslave->base->cmd); }
void spi_init(void)