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mb/siemens/mc_ehl5: Limit eMMC speed mode to DDR50

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Due to layout restrictions on mc_ehl5, the eMMC interface is limited to
operate in DDR50 mode. The alternative modes SDR104 and SDR50 are not
supported. Limit the capabilities in the eMMC controller to DDR50 mode
only so that the eMMC driver in OS will choose the right mode for
operation even if the attached eMMC card supports higher modes.

BUG=none
TEST=Boot into Linux and check dmesg output for mmc modes

Change-Id: Ie3214bc3e25e7af706a5c96244d0be50f4bb3094
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85314
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
This commit is contained in:
Mario Scheithauer 2024-11-26 08:57:09 +01:00 • committed by Werner Zeh
commit 7906bc6576
1 changed files with 9 additions and 0 deletions
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9
src/mainboard/siemens/mc_ehl/variants/mc_ehl5/mainboard.c
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@ -55,6 +55,15 @@ void variant_mainboard_final(void)
reg16 |= HOSTCTRL2_PRESET;
write16(res2mmio(res, HOSTCTRL2, 0), reg16);
}
dev = pcidev_path_on_root(PCH_DEVFN_EMMC);
if (dev) {
struct resource *res = probe_resource(dev, PCI_BASE_ADDRESS_0);
if (!res)
return;
disable_sdr_modes(res);
}
}
static void finalize_boot(void *unused)