Messages in this thread Patch in this message | | | Date | Tue, 16 Mar 2010 21:34:27 +0300 | From | Anton Vorontsov <> | Subject | [PATCH 1/3] sdhci: Implement CAP_CLOCK_BASE_BROKEN quirk |
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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> --- drivers/mmc/host/sdhci.c | 3 ++- 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 d6ab62d..b03e875 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1743,7 +1743,8 @@ 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 842f46f..831bf7f 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 */ -- 1.7.0
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