ACPI: EC: Add delay for slow MSI controller

http://bugzilla.kernel.org/show_bug.cgi?id=12011

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 5c2f5d3..2fe1506 100644 (file)
--- 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)) {