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spi: ti_qspi: Add dummy readl for bus sync

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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>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
This commit is contained in:
Vignesh R 2015-11-10 11:52:10 +05:30 committed by Jagan Teki
parent 3d4825446e
commit 857db48e5f
1 changed files with 2 additions and 0 deletions
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drivers/spi/ti_qspi.c
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@ -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)