diff options
| author | Abel Briggs <abelbriggs1@hotmail.com> | 2022-05-14 10:49:23 -0500 |
|---|---|---|
| committer | Martin L Roth <gaumless@tutanota.com> | 2022-06-24 03:04:23 +0000 |
| commit | cb3c368385307b23bf6597ee3c2f6bb9395ed11e (patch) | |
| tree | 831e91caf38406d65a68b2eef46bade9fdad2f00 /src/ec/acpi/ec.c | |
| parent | ccfbfdf0bbd642617e6a33779846cbff585516c7 (diff) | |
ec/acpi: Return error codes on timeout
The `send` and `recv` API functions currently print error messages
if a timeout occurs while polling the EC, but they perform the I/O
transaction regardless. This can put the EC in a bad state or
otherwise invoke undefined hardware behavior.
Most callers ignore the return value currently, but for callers
which do not, we should make sure our behavior is correct.
Signed-off-by: Abel Briggs <abelbriggs1@hotmail.com>
Change-Id: Ifb87dd1ac869807fd08463bd8fef36d0389b325e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64350
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/ec/acpi/ec.c')
| -rw-r--r-- | src/ec/acpi/ec.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/ec/acpi/ec.c b/src/ec/acpi/ec.c index 7d495a1264..fbd9acda70 100644 --- a/src/ec/acpi/ec.c +++ b/src/ec/acpi/ec.c @@ -47,7 +47,7 @@ int send_ec_command_timeout(u8 command, int timeout_us) if (!ec_ready_send(timeout_us)) { printk(BIOS_DEBUG, "Timeout while sending command 0x%02x to EC!\n", command); - // return -1; + return -1; } outb(command, ec_cmd_reg); @@ -65,7 +65,7 @@ int send_ec_data_timeout(u8 data, int timeout_us) if (!ec_ready_send(timeout_us)) { printk(BIOS_DEBUG, "Timeout while sending data 0x%02x to EC!\n", data); - // return -1; + return -1; } outb(data, ec_data_reg); @@ -73,18 +73,18 @@ int send_ec_data_timeout(u8 data, int timeout_us) return 0; } -u8 recv_ec_data(void) +int recv_ec_data(void) { return recv_ec_data_timeout(EC_RECV_TIMEOUT_US); } -u8 recv_ec_data_timeout(int timeout_us) +int recv_ec_data_timeout(int timeout_us) { u8 data; if (!ec_ready_recv(timeout_us)) { printk(BIOS_DEBUG, "Timeout while receiving data from EC!\n"); - // return -1; + return -1; } data = inb(ec_data_reg); |