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Commit de23f0b7 authored by Raul E Rangel's avatar Raul E Rangel Committed by Ulf Hansson
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mmc: sdhci: sdhci-pci-o2micro: Check if controller supports 8-bit width 



The O2 controller supports 8-bit EMMC access.

JESD84-B51 section A.6.3.a defines the bus testing procedure that
`mmc_select_bus_width()` implements. This is used to determine the actual
bus width of the eMMC.

Signed-off-by: default avatarRaul E Rangel <rrangel@chromium.org>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 99a93444

drivers/mmc/host/sdhci-pci-o2micro.c

+11 −1
Original line number Diff line number Diff line
@@ -395,11 +395,21 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot) 
{

	struct sdhci_pci_chip *chip;

	struct sdhci_host *host;

	u32 reg;

	u32 reg, caps;

	int ret;



	chip = slot->chip;

	host = slot->host;



	caps = sdhci_readl(host, SDHCI_CAPABILITIES);



	/*

	 * mmc_select_bus_width() will test the bus to determine the actual bus

	 * width.

	 */

	if (caps & SDHCI_CAN_DO_8BIT)

		host->mmc->caps |= MMC_CAP_8_BIT_DATA;



	switch (chip->pdev->device) {

	case PCI_DEVICE_ID_O2_SDS0:

	case PCI_DEVICE_ID_O2_SEABIRD0: