https://bugzilla.kernel.org/show_bug.cgi?id=14733
--- Comment #82 from pcxz <aluigi.te...@alice.it> 2012-06-05 06:27:05 ---
This patch work ok for me ( i named it ec.diff ):
[code]
--- drivers/acpi/ec.c 2011-01-05 01:50:19.000000000 +0100
+++ drivers/acpi/ec.c 2011-01-10 15:55:23.000000000 +0100
@@ -223,6 +223,7 @@
if (ec_transaction_done(ec))
return 0;
} else {
+ msleep(1);
if (wait_event_timeout(ec->wait,
ec_transaction_done(ec),
msecs_to_jiffies(1)))
@@ -230,8 +231,8 @@
}
advance_transaction(ec, acpi_ec_read_status(ec));
} while (time_before(jiffies, delay));
- if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
- break;
+// if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
+// break;
pr_debug(PREFIX "controller reset, restart transaction\n");
spin_lock_irqsave(&ec->curr_lock, flags);
start_transaction(ec);
@@ -268,6 +269,15 @@
return (status & ACPI_EC_FLAG_IBF) == 0;
}
+/* try to clean input buffer with burst_disable transaction */
+static int acpi_ec_clean_buffer(struct acpi_ec *ec)
+{
+ struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
+ .wdata = NULL, .rdata = NULL,
+ .wlen = 0, .rlen = 0};
+ return acpi_ec_transaction_unlocked(ec, &t);
+}
+
static int ec_wait_ibf0(struct acpi_ec *ec)
{
unsigned long delay = jiffies + msecs_to_jiffies(ec_delay);
@@ -276,7 +286,8 @@
if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),
msecs_to_jiffies(1)))
return 0;
- return -ETIME;
+// return -ETIME;
+ return acpi_ec_clean_buffer(ec);
}
static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
[/code]
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