From 5423a0cb3f74c16e90683f8ee1cec6c240a9556e Mon Sep 17 00:00:00 2001 From: Alexey Starikovskiy Date: Sat, 21 Feb 2009 12:18:13 -0500 Subject: [PATCH] ACPI: EC: Add delay for slow MSI controller http://bugzilla.kernel.org/show_bug.cgi?id=12011 Signed-off-by: Alexey Starikovskiy Signed-off-by: Len Brown --- drivers/acpi/ec.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 5c2f5d343be..2fe15060dcd 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -120,6 +120,8 @@ static struct acpi_ec { spinlock_t curr_lock; } *boot_ec, *first_ec; +static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ + /* -------------------------------------------------------------------------- Transaction Management -------------------------------------------------------------------------- */ @@ -259,6 +261,8 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); acpi_disable_gpe(NULL, ec->gpe); } + if (EC_FLAGS_MSI) + udelay(ACPI_EC_DELAY); /* start transaction */ spin_lock_irqsave(&ec->curr_lock, tmp); /* following two actions should be kept atomic */ @@ -967,6 +971,11 @@ int __init acpi_ec_ecdt_probe(void) /* * Generate a boot ec context */ + if (dmi_name_in_vendors("Micro-Star") || + dmi_name_in_vendors("Notebook")) { + pr_info(PREFIX "Enabling special treatment for EC from MSI.\n"); + EC_FLAGS_MSI = 1; + } status = acpi_get_table(ACPI_SIG_ECDT, 1, (struct acpi_table_header **)&ecdt_ptr); if (ACPI_SUCCESS(status)) { -- 2.41.1