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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>
This commit is contained in:
Abel Briggs 2022-05-14 10:49:23 -05:00 committed by Martin L Roth
parent ccfbfdf0bb
commit cb3c368385
2 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/ec/acpi/ec.c
View File

@ -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);

4
src/ec/acpi/ec.h
View File

@ -29,8 +29,8 @@ int send_ec_command(u8 command);
int send_ec_command_timeout(u8 command, int timeout);
int send_ec_data(u8 data);
int send_ec_data_timeout(u8 data, int timeout);
u8 recv_ec_data(void);
u8 recv_ec_data_timeout(int timeout);
int recv_ec_data(void);
int recv_ec_data_timeout(int timeout);
void ec_clear_out_queue(void);
u8 ec_status(void);
u8 ec_query(void);