diff options
| author | Felix Held <felix-coreboot@felixheld.de> | 2015-10-11 13:24:40 +0200 |
|---|---|---|
| committer | David Hendricks <dhendrix@chromium.org> | 2015-10-23 20:45:34 +0200 |
| commit | dfb53ef0a572576651b43609c981c811d6473668 (patch) | |
| tree | 7b8ed1a9bdc02efaae25894e5e5f3745384b04af /src/mainboard/asrock | |
| parent | 354c11d10e9e6278d08ea907f84bb2adac37cb32 (diff) | |
asrock/e350m1: disable unconnected GPP PCIe clocks
connections checked by desoldering the FCH and looking at the PCB
this lowers the power consumption by about 150-200mW measured on primary side
based on change #5397
Change-Id: I986c4cc73a247994f2a47fdfd03f585069ca9385
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: http://review.coreboot.org/11866
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/mainboard/asrock')
| -rw-r--r-- | src/mainboard/asrock/e350m1/mainboard.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/mainboard/asrock/e350m1/mainboard.c b/src/mainboard/asrock/e350m1/mainboard.c index ef9b5e9c50..808c6ee545 100644 --- a/src/mainboard/asrock/e350m1/mainboard.c +++ b/src/mainboard/asrock/e350m1/mainboard.c @@ -25,6 +25,7 @@ #include <cpu/amd/mtrr.h> #include <device/pci_def.h> #include <southbridge/amd/cimx/cimx_util.h> +#include "SBPLATFORM.h" //#define SMBUS_IO_BASE 0x6000 void set_pcie_reset(void); @@ -54,6 +55,20 @@ static void mainboard_enable(device_t dev) { printk(BIOS_INFO, "Mainboard " CONFIG_MAINBOARD_PART_NUMBER " Enable.\n"); + /* Power off unused clock pins of GPP PCIe devices */ + u8 *misc_mem_clk_cntrl = (u8 *)(ACPI_MMIO_BASE + MISC_BASE); + /* + * GPP CLK0 connected to unpopulated mini PCIe slot + * GPP CLK1 connected to ethernet chip + */ + write8(misc_mem_clk_cntrl + 0, 0xFF); + /* GPP CLK2 connected to the external USB3 controller */ + write8(misc_mem_clk_cntrl + 1, 0x0F); + write8(misc_mem_clk_cntrl + 2, 0x00); + write8(misc_mem_clk_cntrl + 3, 0x00); + /* SLT_GFX_CLK connected to PCIe slot */ + write8(misc_mem_clk_cntrl + 4, 0xF0); + /* * Initialize ASF registers to an arbitrary address because someone * long ago set things up this way inside the SPD read code. The |