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authorOlof Johansson <olof@lixom.net>2011-01-02 01:37:32 +0100
committerChris Ball <cjb@laptop.org>2011-01-09 05:52:23 +0100
commit30652aa36b58d57fcc1a0acce51e391bbb6edf5e (patch)
tree80743c840e0456381b4e1aea223661eb694a976e /drivers/mmc
parentmmc: check for > 1 clk_requests when disabling gating (diff)
downloadlinux-30652aa36b58d57fcc1a0acce51e391bbb6edf5e.tar.xz
linux-30652aa36b58d57fcc1a0acce51e391bbb6edf5e.zip
mmc: sdhci: add quirk for max len ADMA descriptors
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index d5febe584b05..9e15f41f87be 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -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