From 857db48e5f6372eead8a32469d981801e775ee48 Mon Sep 17 00:00:00 2001 From: Vignesh R Date: Tue, 10 Nov 2015 11:52:10 +0530 Subject: [PATCH] spi: ti_qspi: Add dummy readl for bus sync 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 Reviewed-by: Mugunthan V N Reviewed-by: Jagan Teki --- 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 ecd9d78ae3..646dd899d3 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) -- 2.39.5