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| author | Julian Schroeder <julianmarcusschroeder@gmail.com> | 2021-10-12 10:58:49 -0500 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-10-13 22:01:52 +0000 |
| commit | 5412a81485b27a04c004acdb623d017ffa9bb587 (patch) | |
| tree | 6f6872b4e1fbc637ae28ce3ab2bff49c2d5bb4b1 /src/soc/amd/cezanne/fch.c | |
| parent | 07bf6ff781193081e45e2920682ea2cf08e69cc6 (diff) | |
| download | coreboot-5412a81485b27a04c004acdb623d017ffa9bb587.tar.gz coreboot-5412a81485b27a04c004acdb623d017ffa9bb587.tar.bz2 coreboot-5412a81485b27a04c004acdb623d017ffa9bb587.zip | |
src/soc/amd/cezanne: enable clock gating
Enabling clock gating for CGPLL to lower power consumption in S3
and S0i3 states. See also: Cezanne PPR chapter 7, rev 3.03.
BUG=b:185273565
TEST=iotools mmio_read32 0xfed80e2c and 0e30 show clk gating
enabled and suspend_stress_test works.
Change-Id: I33cbdeec62e49db90b680da37e5028df03a9c015
Signed-off-by: Julian Schroeder <julianmarcusschroeder@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58279
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Diffstat (limited to 'src/soc/amd/cezanne/fch.c')
| -rw-r--r-- | src/soc/amd/cezanne/fch.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/soc/amd/cezanne/fch.c b/src/soc/amd/cezanne/fch.c index ac79cc9e115e..dd19c310bc57 100644 --- a/src/soc/amd/cezanne/fch.c +++ b/src/soc/amd/cezanne/fch.c @@ -169,6 +169,28 @@ static void gpp_clk_setup(void) misc_write32(GPP_CLK_CNTRL, gpp_clk_ctl); } +static void cgpll_clock_gate_init(void) +{ + uint32_t t; + + t = misc_read32(MISC_CLKGATEDCNTL); + t |= ALINKCLK_GATEOFFEN; + t |= BLINKCLK_GATEOFFEN; + t |= XTAL_PAD_S3_TURNOFF_EN; + t |= XTAL_PAD_S5_TURNOFF_EN; + misc_write32(MISC_CLKGATEDCNTL, t); + + t = misc_read32(MISC_CGPLL_CONFIGURATION0); + t |= USB_PHY_CMCLK_S3_DIS; + t |= USB_PHY_CMCLK_S0I3_DIS; + t |= USB_PHY_CMCLK_S5_DIS; + misc_write32(MISC_CGPLL_CONFIGURATION0, t); + + t = pm_read32(PM_ISACONTROL); + t |= ABCLKGATEEN; + pm_write32(PM_ISACONTROL, t); +} + void fch_init(void *chip_info) { fch_init_resets(); @@ -181,6 +203,7 @@ void fch_init(void *chip_info) gpp_clk_setup(); fch_clk_output_48Mhz(); + cgpll_clock_gate_init(); } void fch_final(void *chip_info) |