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sdhci: handle bug in JMB38x for sizes < 4 bytes 

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2008-07-29 00:11:16 +02:00
parent 94ad374a07
commit 4a3cba32cb
3 changed files with 13 additions and 1 deletions
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3
drivers/mmc/host/sdhci-pci.c
View File

@ -143,7 +143,8 @@ static int jmicron_probe(struct sdhci_pci_chip *chip)
chip->quirks |= SDHCI_QUIRK_32BIT_DMA_ADDR |
SDHCI_QUIRK_32BIT_DMA_SIZE |
SDHCI_QUIRK_32BIT_ADMA_SIZE |
SDHCI_QUIRK_RESET_AFTER_REQUEST;
SDHCI_QUIRK_RESET_AFTER_REQUEST |
SDHCI_QUIRK_BROKEN_SMALL_PIO;
}
/*

9
drivers/mmc/host/sdhci.c
View File

@ -278,6 +278,15 @@ static void sdhci_transfer_pio(struct sdhci_host *host)
else
mask = SDHCI_SPACE_AVAILABLE;
/*
* Some controllers (JMicron JMB38x) mess up the buffer bits
* for transfers < 4 bytes. As long as it is just one block,
* we can ignore the bits.
*/
if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
(host->data->blocks == 1))
mask = ~0;
while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
if (host->data->flags & MMC_DATA_READ)
sdhci_read_block_pio(host);

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

@ -206,6 +206,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER (1<<11)
/* Controller provides an incorrect timeout value for transfers */
#define SDHCI_QUIRK_BROKEN_TIMEOUT_VAL (1<<12)
/* Controller has an issue with buffer bits for small transfers */
#define SDHCI_QUIRK_BROKEN_SMALL_PIO (1<<13)
int irq; /* Device IRQ */
void __iomem * ioaddr; /* Mapped address */