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platform/chrome: cros_ec_lpc: Add a new quirk for AML mutex

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Add a new quirk "CROS_EC_LPC_QUIRK_AML_MUTEX" which provides the name
of an AML mutex to protect MEC memory access.

Tested-by: Dustin L. Howett <dustin@howett.net>
Signed-off-by: Ben Walsh <ben@jubnut.com>
Link: https://lore.kernel.org/r/20240605063351.14836-5-ben@jubnut.com
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
This commit is contained in:
Ben Walsh 2024-06-05 07:33:50 +01:00 committed by Tzung-Bi Shih
parent 040159e091
commit 38c31b1d73
1 changed files with 19 additions and 0 deletions
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19
drivers/platform/chrome/cros_ec_lpc.c
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@ -44,6 +44,11 @@ static bool cros_ec_lpc_acpi_device_found;
* the ACPI device.
*/
#define CROS_EC_LPC_QUIRK_ACPI_ID BIT(1)
/*
* Indicates that lpc_driver_data.quirk_aml_mutex_name should be used
* to find an AML mutex to protect access to Microchip EC.
*/
#define CROS_EC_LPC_QUIRK_AML_MUTEX BIT(2)
/**
* struct lpc_driver_data - driver data attached to a DMI device ID to indicate
@ -52,11 +57,14 @@ static bool cros_ec_lpc_acpi_device_found;
* @quirk_mmio_memory_base: The first I/O port addressing EC mapped memory (used
* when quirk ...REMAP_MEMORY is set.)
* @quirk_acpi_id: An ACPI HID to be used to find the ACPI device.
* @quirk_aml_mutex_name: The name of an AML mutex to be used to protect access
* to Microchip EC.
*/
struct lpc_driver_data {
u32 quirks;
u16 quirk_mmio_memory_base;
const char *quirk_acpi_id;
const char *quirk_aml_mutex_name;
};
/**
@ -482,6 +490,17 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
}
ACPI_COMPANION_SET(dev, adev);
}
if (quirks & CROS_EC_LPC_QUIRK_AML_MUTEX) {
const char *name
= driver_data->quirk_aml_mutex_name;
ret = cros_ec_lpc_mec_acpi_mutex(ACPI_COMPANION(dev), name);
if (ret) {
dev_err(dev, "failed to get AML mutex '%s'", name);
return ret;
}
dev_info(dev, "got AML mutex '%s'", name);
}
}
/*