diff options
| author | Pierre Ossman <drzeus@drzeus.cx> | 2006-11-08 23:06:35 +0100 |
|---|---|---|
| committer | Pierre Ossman <drzeus@drzeus.cx> | 2006-12-01 18:54:10 +0100 |
| commit | 077df884835ebf2b5db16aacd9a24691d89902a0 (patch) | |
| tree | 6d812005b3f5c9062ccd8dd2157a558a9bb1f0ed /drivers/mmc/sdhci.c | |
| parent | 7ccd266e676a3f0c6f8f897f58b684cac3dd1650 (diff) | |
mmc: sdhci high speed support
The SDHCI spec implies that is is incorrect to set a clock
frequency above 25 MHz without setting the high speed bit.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc/sdhci.c')
| -rw-r--r-- | drivers/mmc/sdhci.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 54990ed2677..cd98117632d 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -616,6 +616,7 @@ static void sdhci_finish_command(struct sdhci_host *host) static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) { int div; + u8 ctrl; u16 clk; unsigned long timeout; @@ -624,6 +625,13 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL); + ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL); + if (clock > 25000000) + ctrl |= SDHCI_CTRL_HISPD; + else + ctrl &= ~SDHCI_CTRL_HISPD; + writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL); + if (clock == 0) goto out; @@ -1291,6 +1299,13 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot) else if (caps & SDHCI_CAN_VDD_180) mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19; + if ((host->max_clk > 25000000) && !(caps & SDHCI_CAN_DO_HISPD)) { + printk(KERN_ERR "%s: Controller reports > 25 MHz base clock," + " but no high speed support.\n", + host->slot_descr); + mmc->f_max = 25000000; + } + if (mmc->ocr_avail == 0) { printk(KERN_ERR "%s: Hardware doesn't report any " "support voltages.\n", host->slot_descr); |