From 15ec44611904be0dcc97b84c29fbf964e5e2b36f Mon Sep 17 00:00:00 2001 From: Philip Rakity Date: Fri, 19 Nov 2010 16:48:39 -0500 Subject: mmc: sdhci: 8-bit bus width changes We now: * check for a v3 controller before setting 8-bit bus width * offer a callback for platform code to switch to 8-bit mode, which allows non-v3 controllers to support it * rely on mmc->caps |= MMC_CAP_8_BIT_DATA; in platform code to specify that the board designers have indeed brought out all the pins for 8-bit to the slot. We were previously relying only on whether the *controller* supported 8-bit, which doesn't tell us anything about the pin configuration in the board design. This fixes the MMC card regression reported by Maxim Levitsky here: http://thread.gmane.org/gmane.linux.kernel.mmc/4336 by no longer assuming that 8-bit works by default. Signed-off-by: Philip Rakity Tested-by: Giuseppe Cavallaro Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci-pxa.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/mmc/host/sdhci-pxa.c') diff --git a/drivers/mmc/host/sdhci-pxa.c b/drivers/mmc/host/sdhci-pxa.c index fc406ac5d19..5a61208cbc6 100644 --- a/drivers/mmc/host/sdhci-pxa.c +++ b/drivers/mmc/host/sdhci-pxa.c @@ -141,6 +141,10 @@ static int __devinit sdhci_pxa_probe(struct platform_device *pdev) if (pdata->quirks) host->quirks |= pdata->quirks; + /* If slot design supports 8 bit data, indicate this to MMC. */ + if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT) + host->mmc->caps |= MMC_CAP_8_BIT_DATA; + ret = sdhci_add_host(host); if (ret) { dev_err(&pdev->dev, "failed to add host\n"); -- cgit v1.2.3-70-g09d2