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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>
This commit is contained in:
Mario Scheithauer 2022-10-06 12:39:33 +02:00 committed by Martin Roth
parent c8c64c12a5
commit d78722f2f8
1 changed files with 8 additions and 0 deletions
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8
src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c
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@ -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);
}
}