diff options
| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2010-05-27 01:41:53 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 20:12:39 +0400 |
| commit | f27f47ef5b67106ff1cdeebf061387a7b30c12bc (patch) | |
| tree | 0238bc989cefa0df4e64eaa3c21c182c66c294c4 /drivers/mmc | |
| parent | 0e950fa686d53a57ee6c47f477ecfc681670c6a9 (diff) | |
| download | linux-f27f47ef5b67106ff1cdeebf061387a7b30c12bc.tar.xz | |
sdhci: implement CAP_CLOCK_BASE_BROKEN quirk
Some hosts (e.g. as found in CNS3xxx SOCs) report wrong value in
CLOCK_BASE capability field, and currently there is no way to force the
SDHCI core to use the platform-provided base clock value.
This patch implements CAP_CLOCK_BASE_BROKEN quirk. When enabled, the
SDHCI core will always use base clock frequency provided by the platform.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Richard Röjfors <richard.rojfors@pelagicore.com>
Cc: David Vrabel <david.vrabel@csr.com>
Cc: Pierre Ossman <pierre@ossman.eu>
Cc: Ben Dooks <ben@simtec.co.uk>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 3 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci.h | 2 |
2 files changed, 4 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 9d4fdfa685e5..02b365f5a4be 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1744,7 +1744,8 @@ int sdhci_add_host(struct sdhci_host *host) host->max_clk = (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT; host->max_clk *= 1000000; - if (host->max_clk == 0) { + if (host->max_clk == 0 || host->quirks & + SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) { if (!host->ops->get_max_clock) { printk(KERN_ERR "%s: Hardware doesn't specify base clock " diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 842f46f94284..831bf7f137f6 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -236,6 +236,8 @@ struct sdhci_host { #define SDHCI_QUIRK_DELAY_AFTER_POWER (1<<23) /* Controller uses SDCLK instead of TMCLK for data timeouts */ #define SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK (1<<24) +/* Controller reports wrong base clock capability */ +#define SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN (1<<25) int irq; /* Device IRQ */ void __iomem * ioaddr; /* Mapped address */ |