mainboard/google/Kahlee: Select low-power mode for WiFi
Put the PCIe clock pins in power-saving mode for the WiFi module to save
power.
Note: This currently does not appear to have any effect on grunt.
BUG=b:110041917
BRANCH=none
TEST=boot without this patch:
$ iotools mem_read32 0xfed80e00
0x0046f3ff
With this patch:
$ iotools mem_read32 0xfed80e00
0x0046f3f1
Change-Id: I389815bc36b8610a30b0cbb9d73262ad392e0181
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://review.coreboot.org/27465
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/mainboard/google/kahlee/mainboard.c b/src/mainboard/google/kahlee/mainboard.c
index 2efcb20..2540bcd 100644
--- a/src/mainboard/google/kahlee/mainboard.c
+++ b/src/mainboard/google/kahlee/mainboard.c
@@ -150,6 +150,12 @@
GPP_CLK2_CLOCK_REQ_MAP_MASK,
GPP_CLK2_CLOCK_REQ_MAP_CLK_REQ2 <<
GPP_CLK2_CLOCK_REQ_MAP_SHIFT);
+
+ /* Same for the WiFi */
+ clrsetbits_le32((uint32_t *)(MISC_MMIO_BASE + GPP_CLK_CNTRL),
+ GPP_CLK0_CLOCK_REQ_MAP_MASK,
+ GPP_CLK0_CLOCK_REQ_MAP_CLK_REQ0 <<
+ GPP_CLK0_CLOCK_REQ_MAP_SHIFT);
}
/*************************************************