diff options
| author | Hannah Williams <hannah.williams@intel.com> | 2017-12-13 12:44:26 -0800 |
|---|---|---|
| committer | Aaron Durbin <adurbin@chromium.org> | 2018-02-05 18:53:16 +0000 |
| commit | 1177bf516540b62e54cefdf346bb6e8a7c376642 (patch) | |
| tree | 16816da12ba7ba556300e8a5599b0bb21f1a631c | |
| parent | 8b40b675a8e45f748e7fbf2495a7f01684fa0401 (diff) | |
soc/intel/common/block/pmc: Fix ACPI BAR and PCI_COMMAND in PMC config space
read_resources in common/block/pmc/pmc.c is corrupting the BAR
at offset 0x20.
pch_pmc_read_resources
|
pci_dev_read_resources
|
pci_get_resource
Within pci_get_resource, the BAR is read and written back. Since read of
ACPI BAR does not return the correct value, the subsequent write
corrupts the BAR. Hence re-programming the BAR. Also, reading PMC
STATUSCOMMAND register does not return bit 0 correctly in
pci_dev_enable_resources. This causes IO SPACE ACCESS to get disabled.
Hence making sure IO ACCESS gets enabled by setting dev->command
TEST=Can boot to OS
Without this change coreboot will be stuck at "Disabling ACPI via APMC:"
Change-Id: I27062419d06127951ecbbb641835d06ca39ff435
Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Reviewed-on: https://review.coreboot.org/23230
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
| -rw-r--r-- | src/soc/intel/apollolake/Kconfig | 1 | ||||
| -rw-r--r-- | src/soc/intel/common/block/pmc/Kconfig | 7 | ||||
| -rw-r--r-- | src/soc/intel/common/block/pmc/pmc.c | 17 |
3 files changed, 25 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/Kconfig b/src/soc/intel/apollolake/Kconfig index b7f2dc92c4..a9f49dbbfd 100644 --- a/src/soc/intel/apollolake/Kconfig +++ b/src/soc/intel/apollolake/Kconfig @@ -57,6 +57,7 @@ config CPU_SPECIFIC_OPTIONS select PCIEX_LENGTH_256MB select POSTCAR_CONSOLE select POSTCAR_STAGE + select PMC_INVALID_READ_AFTER_WRITE select REG_SCRIPT select RELOCATABLE_RAMSTAGE # Build fails if this is not selected select RTC diff --git a/src/soc/intel/common/block/pmc/Kconfig b/src/soc/intel/common/block/pmc/Kconfig index cfd12d8f3e..46f134e3b1 100644 --- a/src/soc/intel/common/block/pmc/Kconfig +++ b/src/soc/intel/common/block/pmc/Kconfig @@ -30,3 +30,10 @@ config POWER_STATE_PREVIOUS_AFTER_FAILURE power endchoice + +config PMC_INVALID_READ_AFTER_WRITE + bool + default n + help + Enable this for PMC devices where a read back of ACPI BAR and + IO access bit does not return the previously written value. diff --git a/src/soc/intel/common/block/pmc/pmc.c b/src/soc/intel/common/block/pmc/pmc.c index a3c5c4216c..f9563302df 100644 --- a/src/soc/intel/common/block/pmc/pmc.c +++ b/src/soc/intel/common/block/pmc/pmc.c @@ -65,6 +65,23 @@ static void pch_pmc_add_io_resources(struct device *dev, cfg->abase_addr, cfg->abase_size, IORESOURCE_IO | IORESOURCE_ASSIGNED | IORESOURCE_FIXED); + if (IS_ENABLED(CONFIG_PMC_INVALID_READ_AFTER_WRITE)) { + /* + * The ACPI IO BAR (offset 0x20) is not PCI compliant. We've + * observed cases where the BAR reads back as 0, but the IO + * window is open. This also means that it will not respond + * to PCI probing. + */ + pci_write_config16(dev, cfg->abase_offset, cfg->abase_addr); + /* + * In pci_dev_enable_resources, reading IO SPACE ACCESS bit in + * STATUSCOMMAND register does not read back the written + * value correctly, hence IO access gets disabled. This is + * seen in some PMC devices, hence this code makes sure + * IO access is available. + */ + dev->command |= PCI_COMMAND_IO; + } } static void pch_pmc_read_resources(struct device *dev) |