[coreboot-gerrit] Patch set updated for coreboot: pcengines/apu1: disable unused clock outputs
Felix Held (felix-coreboot@felixheld.de)
gerrit at coreboot.org
Fri Nov 6 18:33:28 CET 2015
Felix Held (felix-coreboot at felixheld.de) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/12082
-gerrit
commit 9d473fab9967f4d95bcabd612349513b9988207a
Author: Felix Held <felix-coreboot at felixheld.de>
Date: Fri Nov 6 18:31:01 2015 +0100
pcengines/apu1: disable unused clock outputs
disable unconnected FCH clock outputs to save some power
Change-Id: Ib3efebb8656392d58d762c23827168017d273de8
Signed-off-by: Felix Held <felix-coreboot at felixheld.de>
---
src/mainboard/pcengines/apu1/mainboard.c | 12 ++++++++++++
src/mainboard/pcengines/apu1/platform_cfg.h | 4 ++--
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/src/mainboard/pcengines/apu1/mainboard.c b/src/mainboard/pcengines/apu1/mainboard.c
index f80f24e..82cf992 100644
--- a/src/mainboard/pcengines/apu1/mainboard.c
+++ b/src/mainboard/pcengines/apu1/mainboard.c
@@ -183,6 +183,18 @@ static void mainboard_enable(device_t dev)
config_gpio_mux();
+ /* Power off unused clock pins of GPP PCIe devices */
+ u8 *misc_mem_clk_cntrl = (u8 *)(ACPI_MMIO_BASE + MISC_BASE);
+ /* GPP CLK0-2 are connected to the 3 ethernet chips
+ * GPP CLK3-4 are connected to the miniPCIe slots */
+ write8(misc_mem_clk_cntrl + 0, 0xFF);
+ write8(misc_mem_clk_cntrl + 1, 0xFF);
+ /* GPP CLK5 is only connected to test pads -> disable */
+ write8(misc_mem_clk_cntrl + 2, 0x0F);
+ /* disable unconnected GPP CLK6-8 and SLT_GFX_CLK */
+ write8(misc_mem_clk_cntrl + 3, 0x00);
+ write8(misc_mem_clk_cntrl + 4, 0x00);
+
/* Initialize the PIRQ data structures for consumption */
pirq_setup();
}
diff --git a/src/mainboard/pcengines/apu1/platform_cfg.h b/src/mainboard/pcengines/apu1/platform_cfg.h
index 946f238..7172e82 100644
--- a/src/mainboard/pcengines/apu1/platform_cfg.h
+++ b/src/mainboard/pcengines/apu1/platform_cfg.h
@@ -69,12 +69,12 @@
* 0 - disable
* 1 - enable
* PCI SLOT 0 define at BIT0
- * PCI SLOT 1 define at BIT1
+ * PCI SLOT 1 define at BIT1 -> connected to LPC devices
* PCI SLOT 2 define at BIT2
* PCI SLOT 3 define at BIT3
* PCI SLOT 4 define at BIT4
*/
-#define PCI_CLOCK_CTRL 0x1F
+#define PCI_CLOCK_CTRL 0x02
/**
* @def SATA_CONTROLLER
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