diff options
| author | Mario Scheithauer <mario.scheithauer@siemens.com> | 2022-10-06 12:39:33 +0200 |
|---|---|---|
| committer | Martin Roth <martin.roth@amd.corp-partner.google.com> | 2022-10-07 22:03:54 +0000 |
| commit | d78722f2f85972cdf3e598cf2d374a216ae190c0 (patch) | |
| tree | 1ddbf804bdcde157d6aee6d150ece61109757a85 /src | |
| parent | c8c64c12a55a13116f33d00ebbf64e647f161a23 (diff) | |
mb/siemens/mc_ehl2: Use preset driver strength for SD-Card
The intention of predefining driver strength is to avoid that the OS
SD-Card driver changes this setting.
Change-Id: I02fdac94462da1cd77f8dc972faf16f28d94c946
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68166
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c | 8 |
1 files changed, 8 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 a798398254..339516057a 100644 --- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c +++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c @@ -9,6 +9,8 @@ #include <soc/pci_devs.h> #include <soc/pcr_ids.h> +#define HOSTCTRL2 0x3E +#define HOSTCTRL2_PRESET (1 << 15) #define SD_CAP_BYP 0x810 #define SD_CAP_BYP_EN 0x5A #define SD_CAP_BYP_REG1 0x814 @@ -34,6 +36,7 @@ void variant_mainboard_final(void) dev = pcidev_path_on_root(PCH_DEVFN_SDCARD); if (dev) { uint32_t reg; + uint16_t reg16; struct resource *res = probe_resource(dev, PCI_BASE_ADDRESS_0); if (!res) return; @@ -43,6 +46,11 @@ void variant_mainboard_final(void) reg &= ~(SD_CAP_BYP_SDR104 | SD_CAP_BYP_SDR50); reg |= SD_CAP_BYP_DDR50; write32(res2mmio(res, SD_CAP_BYP_REG1, 0), reg); + + /* Use preset driver strength from preset value registers. */ + reg16 = read16(res2mmio(res, HOSTCTRL2, 0)); + reg16 |= HOSTCTRL2_PRESET; + write16(res2mmio(res, HOSTCTRL2, 0), reg16); } } |