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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>
This commit is contained in:
Simon Glass 2018-07-11 15:51:27 -06:00 committed by Martin Roth
parent 82eb80cc8c
commit e577168ae3
2 changed files with 10 additions and 0 deletions
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6
src/mainboard/google/kahlee/mainboard.c
View File

@ -150,6 +150,12 @@ static void mainboard_init(void *chip_info)
GPP_CLK2_CLOCK_REQ_MAP_MASK, GPP_CLK2_CLOCK_REQ_MAP_MASK,
GPP_CLK2_CLOCK_REQ_MAP_CLK_REQ2 << GPP_CLK2_CLOCK_REQ_MAP_CLK_REQ2 <<
GPP_CLK2_CLOCK_REQ_MAP_SHIFT); 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);
} }
/************************************************* /*************************************************

4
src/soc/amd/stoneyridge/include/soc/southbridge.h
View File

@ -366,6 +366,10 @@
#define GPP_CLK2_CLOCK_REQ_MAP_MASK (0xf << GPP_CLK2_CLOCK_REQ_MAP_SHIFT) #define GPP_CLK2_CLOCK_REQ_MAP_MASK (0xf << GPP_CLK2_CLOCK_REQ_MAP_SHIFT)
#define GPP_CLK2_CLOCK_REQ_MAP_CLK_REQ2 3 #define GPP_CLK2_CLOCK_REQ_MAP_CLK_REQ2 3
#define GPP_CLK0_CLOCK_REQ_MAP_SHIFT 0
#define GPP_CLK0_CLOCK_REQ_MAP_MASK (0xf << GPP_CLK0_CLOCK_REQ_MAP_SHIFT)
#define GPP_CLK0_CLOCK_REQ_MAP_CLK_REQ0 1
struct stoneyridge_aoac { struct stoneyridge_aoac {
int enable; int enable;
int status; int status;