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sunxi: ahci: Add a delay after enabling target power

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If the target power is connected through a gpio, then give the target some
time to power up before continuing with ahci / sata probing, this avoids
link timeouts, without penalizing other boards where there is no target
power gpio.

Why 500 ms ? I started with 200, that was not enough, then I went to 500 which
worked, lowering it to 350 broke things again, so 500 seems the minimum my
vertex2 needs to be ready to get probed.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
This commit is contained in:
Hans de Goede 2014-11-14 16:27:07 +01:00
parent 86b4909340
commit f222c73afa
1 changed files with 2 additions and 0 deletions
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2
board/sunxi/ahci.c
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@ -76,6 +76,8 @@ void scsi_init(void)
#ifdef CONFIG_SATAPWR
gpio_request(CONFIG_SATAPWR, "satapwr");
gpio_direction_output(CONFIG_SATAPWR, 1);
/* Give attached sata device time to power-up to avoid link timeouts */
mdelay(500);
#endif
if (sunxi_ahci_phy_init(SUNXI_SATA_BASE) < 0)