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mmc: sdhci: sdhci-pci-o2micro: Check if controller supports 8-bit width

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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: Raul E Rangel <rrangel@chromium.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Raul E Rangel 2019-06-17 14:10:13 -06:00 committed by Ulf Hansson
parent 99a934443d
commit de23f0b757
1 changed files with 11 additions and 1 deletions
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12
drivers/mmc/host/sdhci-pci-o2micro.c
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@ -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: