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mmc: sdhci: add quirk for max len ADMA descriptors

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Some controllers misparse segment length 0 as being 0, not 65536. Add
a quirk to deal with it.

Signed-off-by: Olof Johansson <olof@lixom.net>
Reviewed-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Olof Johansson 2011-01-01 18:37:32 -06:00 committed by Chris Ball
parent c288b85554
commit 30652aa36b
2 changed files with 9 additions and 3 deletions
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10
drivers/mmc/host/sdhci.c
View File

@ -1949,10 +1949,14 @@ int sdhci_add_host(struct sdhci_host *host)
* of bytes. When doing hardware scatter/gather, each entry cannot
* be larger than 64 KiB though.
*/
if (host->flags & SDHCI_USE_ADMA)
mmc->max_seg_size = 65536;
else
if (host->flags & SDHCI_USE_ADMA) {
if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
mmc->max_seg_size = 65535;
else
mmc->max_seg_size = 65536;
} else {
mmc->max_seg_size = mmc->max_req_size;
}
/*
* Maximum block size. This varies from controller to controller and

2
include/linux/mmc/sdhci.h
View File

@ -83,6 +83,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 (1<<28)
/* Controller doesn't have HISPD bit field in HI-SPEED SD card */
#define SDHCI_QUIRK_NO_HISPD_BIT (1<<29)
/* Controller treats ADMA descriptors with length 0000h incorrectly */
#define SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC (1<<30)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */