diff options
| -rw-r--r-- | src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c index 36252a79a3..a798398254 100644 --- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c +++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c @@ -6,8 +6,16 @@ #include <gpio.h> #include <intelblocks/pcr.h> #include <soc/gpio.h> +#include <soc/pci_devs.h> #include <soc/pcr_ids.h> +#define SD_CAP_BYP 0x810 +#define SD_CAP_BYP_EN 0x5A +#define SD_CAP_BYP_REG1 0x814 +#define SD_CAP_BYP_SDR50 (1 << 13) +#define SD_CAP_BYP_SDR104 (1 << 14) +#define SD_CAP_BYP_DDR50 (1 << 15) + void variant_mainboard_final(void) { struct device *dev; @@ -20,6 +28,22 @@ void variant_mainboard_final(void) dev = dev_find_device(PCI_VID_TI, PCI_DID_TI_XIO2001, 0); if (dev) pci_write_config8(dev, 0xd8, 0x3e); + + /* Limit SD-Card speed to DDR50 mode to avoid SDR104/SDR50 modes due to + layout limitations. */ + dev = pcidev_path_on_root(PCH_DEVFN_SDCARD); + if (dev) { + uint32_t reg; + struct resource *res = probe_resource(dev, PCI_BASE_ADDRESS_0); + if (!res) + return; + write32(res2mmio(res, SD_CAP_BYP, 0), SD_CAP_BYP_EN); + reg = read32(res2mmio(res, SD_CAP_BYP_REG1, 0)); + /* Disable SDR104 and SDR50 mode while keeping DDR50 mode enabled. */ + reg &= ~(SD_CAP_BYP_SDR104 | SD_CAP_BYP_SDR50); + reg |= SD_CAP_BYP_DDR50; + write32(res2mmio(res, SD_CAP_BYP_REG1, 0), reg); + } } static void finalize_boot(void *unused) |