diff options
| -rw-r--r-- | drivers/acpi/ec.c | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 7e1a445955b..6edfbe6f187 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -213,19 +213,14 @@ static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event) smp_mb(); switch (event) { - case ACPI_EC_EVENT_OBF: - if (acpi_ec_read_status(ec) & event) { - ec->burst.expect_event = 0; - return_VALUE(0); - } - break; - case ACPI_EC_EVENT_IBE: if (~acpi_ec_read_status(ec) & event) { ec->burst.expect_event = 0; return_VALUE(0); } break; + default: + break; } result = wait_event_timeout(ec->burst.wait, @@ -255,7 +250,11 @@ static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event) return_VALUE(-ETIME); } -static int acpi_ec_enter_burst_mode(union acpi_ec *ec) +/* + * Note: samsung nv5000 doesn't work with ec burst mode. + * http://bugzilla.kernel.org/show_bug.cgi?id=4980 + */ +int acpi_ec_enter_burst_mode(union acpi_ec *ec) { u32 tmp = 0; int status = 0; @@ -270,8 +269,6 @@ static int acpi_ec_enter_burst_mode(union acpi_ec *ec) acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->common.command_addr); status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); - if (status) - return_VALUE(-EINVAL); acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr); if (tmp != 0x90) { /* Burst ACK byte */ return_VALUE(-EINVAL); @@ -285,13 +282,25 @@ static int acpi_ec_enter_burst_mode(union acpi_ec *ec) return_VALUE(-1); } -static int acpi_ec_leave_burst_mode(union acpi_ec *ec) +int acpi_ec_leave_burst_mode(union acpi_ec *ec) { + int status = 0; ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode"); + status = acpi_ec_read_status(ec); + if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){ + status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); + if(status) + goto end; + acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr); + acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); + } atomic_set(&ec->burst.leaving_burst, 1); return_VALUE(0); +end: + printk("leave burst_mode:error \n"); + return_VALUE(-1); } static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data) @@ -424,7 +433,6 @@ static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data) WARN_ON(in_interrupt()); down(&ec->burst.sem); - acpi_ec_enter_burst_mode(ec); status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); if (status) { printk("read EC, IB not empty\n"); @@ -448,7 +456,6 @@ static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data) *data, address)); end: - acpi_ec_leave_burst_mode(ec); up(&ec->burst.sem); if (ec->common.global_lock) @@ -476,8 +483,6 @@ static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data) WARN_ON(in_interrupt()); down(&ec->burst.sem); - acpi_ec_enter_burst_mode(ec); - status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); if (status) { printk("write EC, IB not empty\n"); @@ -500,7 +505,6 @@ static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data) ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", data, address)); - acpi_ec_leave_burst_mode(ec); up(&ec->burst.sem); if (ec->common.global_lock) |