[U-Boot] [PATCH] mvsata_ide: add delay after EDMA port reset
Albert ARIBAUD
albert.u.boot at aribaud.net
Mon Oct 31 00:32:27 CET 2011
Although fast SoCs like kirkwood can cope without it,
this delay is required by slower chips like orion5x.
Signed-off-by: Albert ARIBAUD <albert.u.boot at aribaud.net>
---
Commit 70c55f5ab324d43093f1c8745462d92042b7306d had introduced resetting
the EDMA port on IDE reset. This obviously worked for kirkwoods, but not
for orion5x Ed Mini V2, where it made ide_reset() fail. Adding a slight
delay after returning port from reset to normal mode made ide_reset()
work again correctly.
Please check and confirm it does not break kirkwoods!
drivers/block/mvsata_ide.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/drivers/block/mvsata_ide.c b/drivers/block/mvsata_ide.c
index 1be395f..75defe7 100644
--- a/drivers/block/mvsata_ide.c
+++ b/drivers/block/mvsata_ide.c
@@ -122,6 +122,7 @@ static int mvsata_ide_initialize_port(struct mvsata_port_registers *port)
writel(MVSATA_EDMA_CMD_ATA_RST, &port->edma_cmd);
udelay(25); /* taken from original marvell port */
writel(0, &port->edma_cmd);
+ udelay(1); /* wait after reset was acked -- required for orion5x */
/* Set control IPM to 3 (no low power) and DET to 1 (initialize) */
control = readl(&port->scontrol);
--
1.7.5.4
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