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68 lines
1.8 KiB
68 lines
1.8 KiB
From: Alexey Starikovskiy <astarikovskiy@suse.de>
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Subject: ACPI: EC: Don't degrade to poll mode at storm automatically.
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References: bnc#446142
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Patch-Mainline: no
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Signed-off-by: Thomas Renninger <trenn@suse.de>
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Not all users of semi-broken EC devices want to degrade to poll mode, so
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give them right to choose.
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Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
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---
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Documentation/kernel-parameters.txt | 5 +++++
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drivers/acpi/ec.c | 15 +++++++++++++++
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2 files changed, 20 insertions(+)
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--- a/Documentation/kernel-parameters.txt
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+++ b/Documentation/kernel-parameters.txt
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@@ -691,6 +691,11 @@ and is between 256 and 4096 characters.
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eata= [HW,SCSI]
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+ ec_intr= [HW,ACPI] ACPI Embedded Controller interrupt mode
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+ Format: <int>
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+ 0: polling mode
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+ non-0: interrupt mode (default)
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+
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edd= [EDD]
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Format: {"off" | "on" | "skip[mbr]"}
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--- a/drivers/acpi/ec.c
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+++ b/drivers/acpi/ec.c
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@@ -118,6 +118,8 @@ static struct acpi_ec {
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spinlock_t curr_lock;
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} *boot_ec, *first_ec;
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+int acpi_ec_intr = 1; /* Default is interrupt mode */
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+
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static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
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/* --------------------------------------------------------------------------
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@@ -754,6 +756,8 @@ static int ec_install_handlers(struct ac
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&acpi_ec_gpe_handler, ec);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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+ if (!acpi_ec_intr)
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+ set_bit(EC_FLAGS_NO_GPE, &ec->flags);
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acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
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acpi_enable_gpe(NULL, ec->gpe);
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status = acpi_install_address_space_handler(ec->handle,
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@@ -1034,3 +1038,14 @@ static void __exit acpi_ec_exit(void)
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return;
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}
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#endif /* 0 */
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+
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+static int __init acpi_ec_set_intr_mode(char *str)
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+{
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+ if (!get_option(&str, &acpi_ec_intr)) {
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+ acpi_ec_intr = 0;
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+ return 0;
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+ }
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+ return 1;
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+}
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+
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+__setup("ec_intr=", acpi_ec_set_intr_mode);
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