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Message-ID: <20240603063834.5580-5-ben@jubnut.com>
Date: Mon, 3 Jun 2024 07:38:33 +0100
From: Ben Walsh <ben@...nut.com>
To: Benson Leung <bleung@...omium.org>,
Tzung-Bi Shih <tzungbi@...nel.org>,
Guenter Roeck <groeck@...omium.org>,
"Dustin L. Howett" <dustin@...ett.net>,
Kieran Levin <ktl@...me.work>,
Thomas Weißschuh <linux@...ssschuh.net>,
Mario Limonciello <mario.limonciello@....com>,
chrome-platform@...ts.linux.dev,
linux-kernel@...r.kernel.org
Cc: Ben Walsh <ben@...nut.com>
Subject: [PATCH v2 4/5] platform/chrome: cros_ec_lpc: Add a new quirk for AML mutex
Add a new quirk "CROS_EC_LPC_QUIRK_AML_MUTEX" which provides the name
of an AML mutex to protect MEC memory access.
Signed-off-by: Ben Walsh <ben@...nut.com>
---
drivers/platform/chrome/cros_ec_lpc.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index c1c26a7ba6d4..60627c5a596b 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -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;
};
/**
@@ -484,6 +492,18 @@ 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(adev, name);
+ if (ret) {
+ dev_err(dev, "failed to get AML mutex '%s'", name);
+ return ret;
+ }
+
+ dev_info(dev, "got AML mutex '%s'", name);
+ }
}
/*
--
2.45.1
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