From 557b06971b1f05cbadec2f376a305ee1954e9b0d Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Thu, 18 Jun 2009 16:53:38 +0200 Subject: 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 Signed-off-by: Pierre Ossman --- drivers/mmc/host/sdhci.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/mmc/host/sdhci.c') diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index c7586739be1e..f4066fdc8906 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1057,6 +1057,13 @@ static void sdhci_set_power(struct sdhci_host *host, unsigned short power) 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); } /*****************************************************************************\ -- cgit v1.2.3