diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/ec.c | 55 |
1 files changed, 36 insertions, 19 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 1fa14634c3f6..982b67faaaf3 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -77,11 +77,12 @@ enum ec_command { enum { EC_FLAGS_QUERY_PENDING, /* Query is pending */ - EC_FLAGS_GPE_STORM, /* GPE storm detected */ EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and * OpReg are installed */ EC_FLAGS_STARTED, /* Driver is started */ EC_FLAGS_STOPPED, /* Driver is stopped */ + EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the + * current command processing */ }; #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ @@ -229,8 +230,10 @@ static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) { if (open) acpi_enable_gpe(NULL, ec->gpe); - else + else { + BUG_ON(ec->reference_count < 1); acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); + } if (acpi_ec_is_gpe_raised(ec)) { /* * On some platforms, EN=1 writes cannot trigger GPE. So @@ -246,8 +249,10 @@ static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) { if (close) acpi_disable_gpe(NULL, ec->gpe); - else + else { + BUG_ON(ec->reference_count < 1); acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); + } } static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) @@ -290,6 +295,24 @@ static void acpi_ec_complete_request(struct acpi_ec *ec) wake_up(&ec->wait); } +static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag) +{ + if (!test_bit(flag, &ec->flags)) { + acpi_ec_disable_gpe(ec, false); + pr_debug("+++++ Polling enabled +++++\n"); + set_bit(flag, &ec->flags); + } +} + +static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag) +{ + if (test_bit(flag, &ec->flags)) { + clear_bit(flag, &ec->flags); + acpi_ec_enable_gpe(ec, false); + pr_debug("+++++ Polling disabled +++++\n"); + } +} + /* * acpi_ec_submit_flushable_request() - Increase the reference count unless * the flush operation is not in @@ -404,8 +427,13 @@ err: * otherwise will take a not handled IRQ as a false one. */ if (!(status & ACPI_EC_FLAG_SCI)) { - if (in_interrupt() && t) - ++t->irq_count; + if (in_interrupt() && t) { + if (t->irq_count < ec_storm_threshold) + ++t->irq_count; + /* Allow triggering on 0 threshold */ + if (t->irq_count == ec_storm_threshold) + acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM); + } } out: if (status & ACPI_EC_FLAG_SCI) @@ -482,6 +510,8 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, spin_unlock_irqrestore(&ec->lock, tmp); ret = ec_poll(ec); spin_lock_irqsave(&ec->lock, tmp); + if (t->irq_count == ec_storm_threshold) + acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM); pr_debug("***** Command(%s) stopped *****\n", acpi_ec_cmd_string(t->command)); ec->curr = NULL; @@ -509,24 +539,11 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) goto unlock; } } - /* disable GPE during transaction if storm is detected */ - if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { - /* It has to be disabled, so that it doesn't trigger. */ - acpi_ec_disable_gpe(ec, false); - } status = acpi_ec_transaction_unlocked(ec, t); - if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { + if (test_bit(EC_FLAGS_COMMAND_STORM, &ec->flags)) msleep(1); - /* It is safe to enable the GPE outside of the transaction. */ - acpi_ec_enable_gpe(ec, false); - } else if (t->irq_count > ec_storm_threshold) { - pr_info("GPE storm detected(%d GPEs), " - "transactions will use polling mode\n", - t->irq_count); - set_bit(EC_FLAGS_GPE_STORM, &ec->flags); - } if (ec->global_lock) acpi_release_global_lock(glk); unlock: |