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soc/amd/picasso/acpi: don't announce unimplemented duty cycle control 

Picasso neither has the corresponding P_CNT register implemented nor
writes a _PTC ACPI object that would specify the P_CNT register. The
Picasso UEFI reference code also sets the duty_width FADT entry to 0.
This also aligns the Picasso code with the Cezanne code in this regard.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I74645e5c4e54a2ad6bc7f9e72f5f656027a79860
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73420
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
This commit is contained in:
Felix Held 2023-03-03 17:54:56 +01:00
parent cc34162734
commit 4b679b0648
1 changed files with 2 additions and 2 deletions
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4
src/soc/amd/picasso/acpi.c
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@ -86,8 +86,8 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
overridden by the _CST packages in the processor devices. */
fadt->p_lvl2_lat = ACPI_FADT_C2_NOT_SUPPORTED;
fadt->p_lvl3_lat = ACPI_FADT_C3_NOT_SUPPORTED;
fadt->duty_offset = 1; /* CLK_VAL bits 3:1 */
fadt->duty_width = 3; /* CLK_VAL bits 3:1 */
fadt->duty_offset = 0; /* Not supported */
fadt->duty_width = 0; /* Not supported */
fadt->day_alrm = RTC_DATE_ALARM;
fadt->iapc_boot_arch = cfg->fadt_boot_arch; /* legacy free default */
fadt->flags |= ACPI_FADT_WBINVD | /* See table 5-34 ACPI 6.3 spec */