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| author | Pierre Ossman <drzeus@drzeus.cx> | 2007-12-02 19:45:19 +0100 |
|---|---|---|
| committer | Pierre Ossman <drzeus@drzeus.cx> | 2007-12-12 20:01:00 +0100 |
| commit | dc93441b3f5879a096dd117a81df541b0855ebbb (patch) | |
| tree | de8e7c3391d0f9522622498d0d27517a722ed251 | |
| parent | 75b8c133267053c9986a7c8db5131f0e7349e806 (diff) | |
| download | linux-dc93441b3f5879a096dd117a81df541b0855ebbb.tar.bz2 | |
sdhci: describe quirks
Add a comment for each quirk to describe what it does and why.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index ff59d2e0475b..17b4e391db35 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -26,12 +26,22 @@ static unsigned int debug_quirks = 0; +/* + * Different quirks to handle when the hardware deviates from a strict + * interpretation of the SDHCI specification. + */ + +/* Controller doesn't honor resets unless we touch the clock register */ #define SDHCI_QUIRK_CLOCK_BEFORE_RESET (1<<0) +/* Controller has bad caps bits, but really supports DMA */ #define SDHCI_QUIRK_FORCE_DMA (1<<1) /* Controller doesn't like some resets when there is no card inserted. */ #define SDHCI_QUIRK_NO_CARD_NO_RESET (1<<2) +/* Controller doesn't like clearing the power reg before a change */ #define SDHCI_QUIRK_SINGLE_POWER_WRITE (1<<3) +/* Controller has flaky internal state so reset it on each ios change */ #define SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS (1<<4) +/* Controller has an unusable DMA engine */ #define SDHCI_QUIRK_BROKEN_DMA (1<<5) static const struct pci_device_id pci_ids[] __devinitdata = { |