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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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20
drivers/mmc/host/sdhci-pci.c
View file

@ -284,6 +284,18 @@ static const struct sdhci_pci_fixes sdhci_jmicron = {
.resume = jmicron_resume,
};
static int via_probe(struct sdhci_pci_chip *chip)
{
if (chip->pdev->revision == 0x10)
chip->quirks |= SDHCI_QUIRK_DELAY_AFTER_POWER;
return 0;
}
static const struct sdhci_pci_fixes sdhci_via = {
.probe = via_probe,
};
static const struct pci_device_id pci_ids[] __devinitdata = {
{
.vendor = PCI_VENDOR_ID_RICOH,
@ -349,6 +361,14 @@ static const struct pci_device_id pci_ids[] __devinitdata = {
.driver_data = (kernel_ulong_t)&sdhci_jmicron,
},
{
.vendor = PCI_VENDOR_ID_VIA,
.device = 0x95d0,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = (kernel_ulong_t)&sdhci_via,
},
{ /* Generic SD host controller */
PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
},

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);
}
/*****************************************************************************\

2
drivers/mmc/host/sdhci.h
View file

@ -230,6 +230,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_NO_MULTIBLOCK (1<<21)
/* Controller can only handle 1-bit data transfers */
#define SDHCI_QUIRK_FORCE_1_BIT_DATA (1<<22)
/* Controller needs 10ms delay between applying power and clock */
#define SDHCI_QUIRK_DELAY_AFTER_POWER (1<<23)
int irq; /* Device IRQ */
void __iomem * ioaddr; /* Mapped address */