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sdhci: Specific quirk vor VIA SDHCI controller in VX855ES

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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>
This commit is contained in:
Harald Welte
2009-06-18 16:53:38 +02:00
committed by Pierre Ossman
parent fe9db6cbf1
commit 557b06971b
3 changed files with 29 additions and 0 deletions
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7
drivers/mmc/host/sdhci.c
View File

@@ -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);
}
/*****************************************************************************\