sdhci: Specific quirk vor VIA SDHCI controller in VX855ES
The SDHCI controller found in the VX855ES requires 10ms
delay between applying power and applying clock.
This issue has been discovered and documented by the OLPC XO1.5 team.
Signed-off-by: Harald Welte <HaraldWelte@viatech.com>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c758673..f4066fd 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1057,6 +1057,13 @@
pwr |= SDHCI_POWER_ON;
sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+
+ /*
+ * Some controllers need an extra 10ms delay of 10ms before they
+ * can apply clock after applying power
+ */
+ if ((host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER))
+ mdelay(10);
}
/*****************************************************************************\