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Code Issues Releases Wiki Activity

lspcon: restart MPU on programmer shutdown

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Programmer initialization stops the on-chip MPU, and it was never
restarted. Leaving it stopped seems to prevent some display detection
from working, so implement restarting the MPU on programmer shutdown.

BUG=b:190359231
TEST=display hotplug works reliably after device communication

Change-Id: I66cd68f8f6905a2bfaf5b085bf08dcb218f42855
Reviewed-on: https://review.coreboot.org/c/flashrom/+/55403
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Sam McNally <sammc@google.com>
This commit is contained in:
Peter Marheine
2021-06-11 09:27:30 +10:00
committed by Edward O'Callaghan
parent 508fb169ed
commit db2a639aec
1 changed files with 9 additions and 6 deletions
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15
lspcon_i2c_spi.c
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@@ -318,11 +318,13 @@ static int lspcon_i2c_clt2_spi_reset(int fd)
return ret;
}
static int lspcon_i2c_spi_reset_mpu_stop(int fd)
static int lspcon_i2c_spi_set_mpu_active(int fd, int running)
{
int ret = 0;
ret |= lspcon_i2c_spi_write_register(fd, MPU, 0xc0); // cmd mode
ret |= lspcon_i2c_spi_write_register(fd, MPU, 0x40); // stop mcu
// Cmd mode
ret |= lspcon_i2c_spi_write_register(fd, MPU, 0xc0);
// Stop or release MPU
ret |= lspcon_i2c_spi_write_register(fd, MPU, running ? 0 : 0x40);
return ret;
}
@@ -418,15 +420,16 @@ static const struct spi_master spi_master_i2c_lspcon = {
.write_aai = lspcon_i2c_spi_write_aai,
};
/* TODO: MPU still stopped at this point, probably need to reset it. */
static int lspcon_i2c_spi_shutdown(void *data)
{
int ret = 0;
struct lspcon_i2c_spi_data *lspcon_data =
(struct lspcon_i2c_spi_data *)data;
int fd = lspcon_data->fd;
ret |= lspcon_i2c_spi_enable_write_protection(fd);
ret |= lspcon_i2c_spi_toggle_register_protection(fd, 0);
ret |= lspcon_i2c_spi_set_mpu_active(fd, 1);
i2c_close(fd);
free(data);
@@ -439,9 +442,9 @@ static int lspcon_i2c_spi_init(void)
if (fd < 0)
return fd;
int ret = lspcon_i2c_spi_reset_mpu_stop(fd);
int ret = lspcon_i2c_spi_set_mpu_active(fd, 0);
if (ret) {
msg_perr("%s: call to reset_mpu_stop failed.\n", __func__);
msg_perr("%s: call to set_mpu_active failed.\n", __func__);
i2c_close(fd);
return ret;
}