From 7906bc65768b9543d262586797274f5f93b15996 Mon Sep 17 00:00:00 2001 From: Mario Scheithauer Date: Tue, 26 Nov 2024 08:57:09 +0100 Subject: mb/siemens/mc_ehl5: Limit eMMC speed mode to DDR50 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 Reviewed-on: https://review.coreboot.org/c/coreboot/+/85314 Tested-by: build bot (Jenkins) Reviewed-by: Werner Zeh --- src/mainboard/siemens/mc_ehl/variants/mc_ehl5/mainboard.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'src/mainboard/siemens/mc_ehl') diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl5/mainboard.c b/src/mainboard/siemens/mc_ehl/variants/mc_ehl5/mainboard.c index e6e7e7129e..2c37c69698 100644 --- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl5/mainboard.c +++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl5/mainboard.c @@ -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) -- cgit v1.2.3