Some controllers misparse segment length 0 as being 0, not 65536. Add
a quirk to deal with it.
Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 10 +++++++---
include/linux/mmc/sdhci.h | 2 ++
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index a25db426..c0094c1 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1928,10 +1928,14 @@ 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
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 1fdc673..dfb2106 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -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 */
--
1.7.3.GIT
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