tree a3f5c00b87efa64a26127c9bc1c73d3a51d703cd parent cbfc1bae55bbd053308ef0fa6b6448cd1ddf3e67 author Luming Yu <[EMAIL PROTECTED]> Wed, 10 Aug 2005 09:40:00 -0400 committer Len Brown <[EMAIL PROTECTED]> Fri, 12 Aug 2005 01:30:51 -0400
[ACPI] Fix "ec_burst=1" mode latency issue http://bugzilla.kernel.org/show_bug.cgi?id=3851 Signed-off-by: Luming Yu <[EMAIL PROTECTED]> Signed-off-by: Len Brown <[EMAIL PROTECTED]> drivers/acpi/ec.c | 169 ++++++++++++++++++------------------------------------ 1 files changed, 59 insertions(+), 110 deletions(-) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -234,18 +234,29 @@ static int acpi_ec_burst_wait(union acpi ec->burst.expect_event = event; smp_mb(); - result = wait_event_interruptible_timeout(ec->burst.wait, + 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; + } + + result = wait_event_timeout(ec->burst.wait, !ec->burst.expect_event, msecs_to_jiffies(ACPI_EC_DELAY)); ec->burst.expect_event = 0; smp_mb(); - if (result < 0){ - ACPI_DEBUG_PRINT((ACPI_DB_ERROR," result = %d ", result)); - return_VALUE(result); - } - /* * Verify that the event in question has actually happened by * querying EC status. Do the check even if operation timed-out @@ -280,14 +291,14 @@ acpi_ec_enter_burst_mode ( status = acpi_ec_read_status(ec); if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)){ + status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); + if(status) + goto end; 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){ - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); + if (status) return_VALUE(-EINVAL); - } acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr); - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); if(tmp != 0x90 ) {/* Burst ACK byte*/ return_VALUE(-EINVAL); } @@ -295,31 +306,19 @@ acpi_ec_enter_burst_mode ( atomic_set(&ec->burst.leaving_burst , 0); return_VALUE(0); +end: + printk("Error in acpi_ec_wait\n"); + return_VALUE(-1); } static int acpi_ec_leave_burst_mode ( union acpi_ec *ec) { - int status =0; ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode"); - atomic_set(&ec->burst.leaving_burst , 1); - status = acpi_ec_read_status(ec); - if (status != -EINVAL && - (status & ACPI_EC_FLAG_BURST)){ - acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr); - status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); - if (status){ - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); - ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n")); - return_VALUE(-EINVAL); - } - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); - status = acpi_ec_read_status(ec); - } - + atomic_set(&ec->burst.leaving_burst, 1); return_VALUE(0); } @@ -461,7 +460,6 @@ acpi_ec_burst_read ( if (!ec || !data) return_VALUE(-EINVAL); -retry: *data = 0; if (ec->common.global_lock) { @@ -473,26 +471,25 @@ retry: WARN_ON(in_interrupt()); down(&ec->burst.sem); - if(acpi_ec_enter_burst_mode(ec)) + acpi_ec_enter_burst_mode(ec); + status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); + if (status) { + printk("read EC, IB not empty\n"); goto end; - + } acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->common.command_addr); status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); if (status) { - goto end; + printk("read EC, IB not empty\n"); } acpi_hw_low_level_write(8, address, &ec->common.data_addr); status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); if (status){ - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); + printk("read EC, OB not full\n"); goto end; } - acpi_hw_low_level_read(8, data, &ec->common.data_addr); - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", *data, address)); @@ -503,15 +500,6 @@ end: if (ec->common.global_lock) acpi_release_global_lock(glk); - if(atomic_read(&ec->burst.leaving_burst) == 2){ - ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); - while(atomic_read(&ec->burst.pending_gpe)){ - msleep(1); - } - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); - goto retry; - } - return_VALUE(status); } @@ -524,13 +512,12 @@ acpi_ec_burst_write ( { int status = 0; u32 glk; - u32 tmp; ACPI_FUNCTION_TRACE("acpi_ec_write"); if (!ec) return_VALUE(-EINVAL); -retry: + if (ec->common.global_lock) { status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); if (ACPI_FAILURE(status)) @@ -540,61 +527,35 @@ retry: WARN_ON(in_interrupt()); down(&ec->burst.sem); - if(acpi_ec_enter_burst_mode(ec)) - goto end; + acpi_ec_enter_burst_mode(ec); - status = acpi_ec_read_status(ec); - if (status != -EINVAL && - !(status & ACPI_EC_FLAG_BURST)){ - 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) - goto end; - acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr); - if(tmp != 0x90 ) /* Burst ACK byte*/ - goto end; + status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); + if ( status) { + printk("write EC, IB not empty\n"); } - /*Now we are in burst mode*/ - acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->common.command_addr); status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); - if (status){ - goto end; + if (status) { + printk ("write EC, IB not empty\n"); } acpi_hw_low_level_write(8, address, &ec->common.data_addr); status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); if (status){ - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); - goto end; + printk("write EC, IB not empty\n"); } acpi_hw_low_level_write(8, data, &ec->common.data_addr); - status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); - if (status) - goto end; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", data, address)); -end: acpi_ec_leave_burst_mode(ec); up(&ec->burst.sem); if (ec->common.global_lock) acpi_release_global_lock(glk); - if(atomic_read(&ec->burst.leaving_burst) == 2){ - ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); - while(atomic_read(&ec->burst.pending_gpe)){ - msleep(1); - } - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); - goto retry; - } - return_VALUE(status); } @@ -719,8 +680,12 @@ acpi_ec_burst_query ( } down(&ec->burst.sem); - if(acpi_ec_enter_burst_mode(ec)) + + status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); + if (status) { + printk("query EC, IB not empty\n"); goto end; + } /* * Query the EC to find out which _Qxx method we need to evaluate. * Note that successful completion of the query causes the ACPI_EC_SCI @@ -729,27 +694,20 @@ acpi_ec_burst_query ( acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->common.command_addr); status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); if (status){ - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); + printk("query EC, OB not full\n"); goto end; } acpi_hw_low_level_read(8, data, &ec->common.data_addr); - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); if (!*data) status = -ENODATA; end: - acpi_ec_leave_burst_mode(ec); up(&ec->burst.sem); if (ec->common.global_lock) acpi_release_global_lock(glk); - if(atomic_read(&ec->burst.leaving_burst) == 2){ - ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); - acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR); - status = -ENODATA; - } return_VALUE(status); } @@ -885,31 +843,21 @@ acpi_ec_gpe_burst_handler ( if (!ec) return ACPI_INTERRUPT_NOT_HANDLED; - acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); - + acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR); value = acpi_ec_read_status(ec); - if((value & ACPI_EC_FLAG_IBF) && - !(value & ACPI_EC_FLAG_BURST) && - (atomic_read(&ec->burst.leaving_burst) == 0)) { - /* - * the embedded controller disables - * burst mode for any reason other - * than the burst disable command - * to process critical event. - */ - atomic_set(&ec->burst.leaving_burst , 2); /* block current pending transaction - and retry */ + switch ( ec->burst.expect_event) { + case ACPI_EC_EVENT_OBF: + if (!(value & ACPI_EC_FLAG_OBF)) + break; + case ACPI_EC_EVENT_IBE: + if ((value & ACPI_EC_FLAG_IBF)) + break; + ec->burst.expect_event = 0; wake_up(&ec->burst.wait); - }else { - if ((ec->burst.expect_event == ACPI_EC_EVENT_OBF && - (value & ACPI_EC_FLAG_OBF)) || - (ec->burst.expect_event == ACPI_EC_EVENT_IBE && - !(value & ACPI_EC_FLAG_IBF))) { - ec->burst.expect_event = 0; - wake_up(&ec->burst.wait); - return ACPI_INTERRUPT_HANDLED; - } + return ACPI_INTERRUPT_HANDLED; + default: + break; } if (value & ACPI_EC_FLAG_SCI){ @@ -1242,6 +1190,7 @@ acpi_ec_burst_add ( if (result) goto end; + printk("burst-mode-ec-10-Aug\n"); printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n", acpi_device_name(device), acpi_device_bid(device), (u32) ec->common.gpe_bit); - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
