From 0af2f653c504d302d83d3a648c0408882ff62d4c Mon Sep 17 00:00:00 2001 From: Len Brown Date: Tue, 20 Nov 2007 19:59:08 -0500 Subject: [PATCH 1/3] Revert "ACPI: EC: Workaround for optimized controllers" This reverts commit f2d68935ba08cf80f151bbdb5628381184e4a498. --- drivers/acpi/ec.c | 35 +++++++++++++---------------------- 1 file changed, 13 insertions(+), 22 deletions(-) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 390f8f8666da..06b78e5e33a1 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -75,8 +75,7 @@ enum { EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ EC_FLAGS_QUERY_PENDING, /* Query is pending */ EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */ - EC_FLAGS_NO_ADDRESS_GPE, /* Expect GPE only for non-address event */ - EC_FLAGS_ADDRESS, /* Address is being written */ + EC_FLAGS_ONLY_IBF_GPE, /* Expect GPE only for IBF = 0 event */ }; static int acpi_ec_remove(struct acpi_device *device, int type); @@ -167,45 +166,38 @@ static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) { - int ret = 0; - if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) && - test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags))) - force_poll = 1; if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) && likely(!force_poll)) { if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event), msecs_to_jiffies(ACPI_EC_DELAY))) - goto end; + return 0; clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); if (acpi_ec_check_status(ec, event)) { - if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) { - /* miss address GPE, don't expect it anymore */ - printk(KERN_INFO PREFIX "missing address confirmation," - "don't expect it any longer.\n"); - set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags); + if (event == ACPI_EC_EVENT_OBF_1) { + /* miss OBF = 1 GPE, don't expect it anymore */ + printk(KERN_INFO PREFIX "missing OBF_1 confirmation," + "switching to degraded mode.\n"); + set_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags); } else { /* missing GPEs, switch back to poll mode */ - printk(KERN_INFO PREFIX "missing confirmations," + printk(KERN_INFO PREFIX "missing IBF_1 confirmations," "switch off interrupt mode.\n"); clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); } - goto end; + return 0; } } else { unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); while (time_before(jiffies, delay)) { if (acpi_ec_check_status(ec, event)) - goto end; + return 0; } } printk(KERN_ERR PREFIX "acpi_ec_wait timeout," " status = %d, expect_event = %d\n", acpi_ec_read_status(ec), event); - ret = -ETIME; - end: - clear_bit(EC_FLAGS_ADDRESS, &ec->flags); - return ret; + return -ETIME; } static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, @@ -224,9 +216,6 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, "write_cmd timeout, command = %d\n", command); goto end; } - /* mark the address byte written to EC */ - if (rdata_len + wdata_len > 1) - set_bit(EC_FLAGS_ADDRESS, &ec->flags); set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); acpi_ec_write_data(ec, *(wdata++)); } @@ -242,6 +231,8 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); for (; rdata_len > 0; --rdata_len) { + if (test_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags)) + force_poll = 1; result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll); if (result) { printk(KERN_ERR PREFIX "read timeout, command = %d\n", From 3ebe08a749a0971a5407818169dc16212ef562f9 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?M=C3=A1rton=20N=C3=A9meth?= Date: Wed, 21 Nov 2007 03:23:26 +0300 Subject: [PATCH 2/3] ACPI: EC: use printk_ratelimit(), add some DEBUG mode messages MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sometimes it is usefull to see raw protocol dump. Uncomment '#define DEBUG' at the beginning of file to make EC really verbose. Signed-off-by: Márton Németh Signed-off-by: Alexey Starikovskiy Signed-off-by: Len Brown --- drivers/acpi/ec.c | 50 +++++++++++++++++++++++++++++------------------ 1 file changed, 31 insertions(+), 19 deletions(-) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 06b78e5e33a1..d5a5958d4b20 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -47,6 +47,9 @@ #undef PREFIX #define PREFIX "ACPI: EC: " +/* Uncomment next line to get verbose print outs*/ +/* #define DEBUG */ + /* EC status register */ #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ @@ -131,21 +134,27 @@ static struct acpi_ec { static inline u8 acpi_ec_read_status(struct acpi_ec *ec) { - return inb(ec->command_addr); + u8 x = inb(ec->command_addr); + pr_debug(PREFIX "---> status = 0x%2x\n", x); + return x; } static inline u8 acpi_ec_read_data(struct acpi_ec *ec) { + u8 x = inb(ec->data_addr); + pr_debug(PREFIX "---> data = 0x%2x\n", x); return inb(ec->data_addr); } static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) { + pr_debug(PREFIX "<--- command = 0x%2x\n", command); outb(command, ec->command_addr); } static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) { + pr_debug(PREFIX "<--- data = 0x%2x\n", data); outb(data, ec->data_addr); } @@ -175,13 +184,14 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) if (acpi_ec_check_status(ec, event)) { if (event == ACPI_EC_EVENT_OBF_1) { /* miss OBF = 1 GPE, don't expect it anymore */ - printk(KERN_INFO PREFIX "missing OBF_1 confirmation," + pr_info(PREFIX "missing OBF_1 confirmation," "switching to degraded mode.\n"); set_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags); } else { /* missing GPEs, switch back to poll mode */ - printk(KERN_INFO PREFIX "missing IBF_1 confirmations," - "switch off interrupt mode.\n"); + if (printk_ratelimit()) + pr_info(PREFIX "missing IBF_1 confirmations," + "switch off interrupt mode.\n"); clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); } return 0; @@ -194,7 +204,7 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) return 0; } } - printk(KERN_ERR PREFIX "acpi_ec_wait timeout," + pr_err(PREFIX "acpi_ec_wait timeout," " status = %d, expect_event = %d\n", acpi_ec_read_status(ec), event); return -ETIME; @@ -208,11 +218,11 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, int result = 0; set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); acpi_ec_write_cmd(ec, command); - + pr_debug(PREFIX "transaction start\n"); for (; wdata_len > 0; --wdata_len) { result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); if (result) { - printk(KERN_ERR PREFIX + pr_err(PREFIX "write_cmd timeout, command = %d\n", command); goto end; } @@ -223,7 +233,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, if (!rdata_len) { result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); if (result) { - printk(KERN_ERR PREFIX + pr_err(PREFIX "finish-write timeout, command = %d\n", command); goto end; } @@ -235,8 +245,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, force_poll = 1; result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll); if (result) { - printk(KERN_ERR PREFIX "read timeout, command = %d\n", - command); + pr_err(PREFIX "read timeout, command = %d\n", command); goto end; } /* Don't expect GPE after last read */ @@ -245,6 +254,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, *(rdata++) = acpi_ec_read_data(ec); } end: + pr_debug(PREFIX "transaction end\n"); return result; } @@ -273,8 +283,8 @@ static int acpi_ec_transaction(struct acpi_ec *ec, u8 command, status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0); if (status) { - printk(KERN_ERR PREFIX - "input buffer is not empty, aborting transaction\n"); + pr_err(PREFIX "input buffer is not empty, " + "aborting transaction\n"); goto end; } @@ -488,6 +498,7 @@ static u32 acpi_ec_gpe_handler(void *data) acpi_status status = AE_OK; struct acpi_ec *ec = data; + pr_debug(PREFIX "~~~> interrupt\n"); clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) wake_up(&ec->wait); @@ -498,8 +509,9 @@ static u32 acpi_ec_gpe_handler(void *data) acpi_ec_gpe_query, ec); } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) { /* this is non-query, must be confirmation */ - printk(KERN_INFO PREFIX "non-query interrupt received," - " switching to interrupt mode\n"); + if (printk_ratelimit()) + pr_info(PREFIX "non-query interrupt received," + " switching to interrupt mode\n"); set_bit(EC_FLAGS_GPE_MODE, &ec->flags); } @@ -701,10 +713,10 @@ static void ec_remove_handlers(struct acpi_ec *ec) { if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) - printk(KERN_ERR PREFIX "failed to remove space handler\n"); + pr_err(PREFIX "failed to remove space handler\n"); if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler))) - printk(KERN_ERR PREFIX "failed to remove gpe handler\n"); + pr_err(PREFIX "failed to remove gpe handler\n"); ec->handlers_installed = 0; } @@ -747,9 +759,9 @@ static int acpi_ec_add(struct acpi_device *device) first_ec = ec; acpi_driver_data(device) = ec; acpi_ec_add_fs(device); - printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", + pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", ec->gpe, ec->command_addr, ec->data_addr); - printk(KERN_INFO PREFIX "driver started in %s mode\n", + pr_info(PREFIX "driver started in %s mode\n", (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); return 0; } @@ -875,7 +887,7 @@ int __init acpi_ec_ecdt_probe(void) status = acpi_get_table(ACPI_SIG_ECDT, 1, (struct acpi_table_header **)&ecdt_ptr); if (ACPI_SUCCESS(status)) { - printk(KERN_INFO PREFIX "EC description table is found, configuring boot EC\n"); + pr_info(PREFIX "EC description table is found, configuring boot EC\n"); boot_ec->command_addr = ecdt_ptr->control.address; boot_ec->data_addr = ecdt_ptr->data.address; boot_ec->gpe = ecdt_ptr->gpe; From e790cc8bbb990df900eabdda18a5a480d22a60c8 Mon Sep 17 00:00:00 2001 From: Alexey Starikovskiy Date: Wed, 21 Nov 2007 03:23:32 +0300 Subject: [PATCH 3/3] ACPI: EC: Workaround for optimized controllers (version 3) Some controllers fail to send confirmation GPE after address or data write. Detect this and don't expect such confirmation in future. This is a generalization of previous workaround (66c5f4e7367b0085652931b2f3366de29e7ff5ec), which did only read address. Reference: http://bugzilla.kernel.org/show_bug.cgi?id=9327 Signed-off-by: Alexey Starikovskiy Tested-by: Romano Giannetti Tested-by: Mats Johannesson Signed-off-by: Len Brown --- drivers/acpi/ec.c | 46 +++++++++++++++++++++++++---------- drivers/acpi/processor_core.c | 5 +++- 2 files changed, 37 insertions(+), 14 deletions(-) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index d5a5958d4b20..7d6b84119792 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -78,7 +78,10 @@ enum { EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ EC_FLAGS_QUERY_PENDING, /* Query is pending */ EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */ - EC_FLAGS_ONLY_IBF_GPE, /* Expect GPE only for IBF = 0 event */ + EC_FLAGS_NO_ADDRESS_GPE, /* Expect GPE only for non-address event */ + EC_FLAGS_ADDRESS, /* Address is being written */ + EC_FLAGS_NO_WDATA_GPE, /* Don't expect WDATA GPE event */ + EC_FLAGS_WDATA, /* Data is being written */ }; static int acpi_ec_remove(struct acpi_device *device, int type); @@ -175,39 +178,54 @@ static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) { + int ret = 0; + if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) && + test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags))) + force_poll = 1; + if (unlikely(test_bit(EC_FLAGS_WDATA, &ec->flags) && + test_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags))) + force_poll = 1; if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) && likely(!force_poll)) { if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event), msecs_to_jiffies(ACPI_EC_DELAY))) - return 0; + goto end; clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); if (acpi_ec_check_status(ec, event)) { - if (event == ACPI_EC_EVENT_OBF_1) { - /* miss OBF = 1 GPE, don't expect it anymore */ - pr_info(PREFIX "missing OBF_1 confirmation," - "switching to degraded mode.\n"); - set_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags); + if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) { + /* miss address GPE, don't expect it anymore */ + pr_info(PREFIX "missing address confirmation, " + "don't expect it any longer.\n"); + set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags); + } else if (test_bit(EC_FLAGS_WDATA, &ec->flags)) { + /* miss write data GPE, don't expect it */ + pr_info(PREFIX "missing write data confirmation, " + "don't expect it any longer.\n"); + set_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags); } else { /* missing GPEs, switch back to poll mode */ if (printk_ratelimit()) - pr_info(PREFIX "missing IBF_1 confirmations," + pr_info(PREFIX "missing confirmations, " "switch off interrupt mode.\n"); clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); } - return 0; + goto end; } } else { unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); while (time_before(jiffies, delay)) { if (acpi_ec_check_status(ec, event)) - return 0; + goto end; } } pr_err(PREFIX "acpi_ec_wait timeout," " status = %d, expect_event = %d\n", acpi_ec_read_status(ec), event); - return -ETIME; + ret = -ETIME; + end: + clear_bit(EC_FLAGS_ADDRESS, &ec->flags); + return ret; } static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, @@ -226,11 +244,15 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, "write_cmd timeout, command = %d\n", command); goto end; } + /* mark the address byte written to EC */ + if (rdata_len + wdata_len > 1) + set_bit(EC_FLAGS_ADDRESS, &ec->flags); set_bit(EC_FLAGS_WAIT_GPE, &ec->flags); acpi_ec_write_data(ec, *(wdata++)); } if (!rdata_len) { + set_bit(EC_FLAGS_WDATA, &ec->flags); result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll); if (result) { pr_err(PREFIX @@ -241,8 +263,6 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command, clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); for (; rdata_len > 0; --rdata_len) { - if (test_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags)) - force_poll = 1; result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll); if (result) { pr_err(PREFIX "read timeout, command = %d\n", command); diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 235a51e328c3..692b2a0a05b2 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -684,7 +684,7 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) { struct acpi_processor *pr = data; struct acpi_device *device = NULL; - + int saved; if (!pr) return; @@ -694,7 +694,10 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) switch (event) { case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: + saved = pr->performance_platform_limit; acpi_processor_ppc_has_changed(pr); + if (saved == pr->performance_platform_limit) + break; acpi_bus_generate_proc_event(device, event, pr->performance_platform_limit); acpi_bus_generate_netlink_event(device->pnp.device_class,