diff options
Diffstat (limited to 'src/drivers')
| -rw-r--r-- | src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c b/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c index e0058c4fe7..effa841690 100644 --- a/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c +++ b/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c @@ -415,15 +415,20 @@ static void sn65dsi86_bridge_link_training(uint8_t bus, uint8_t chip) sn65dsi86_bridge_dpcd_request(bus, chip, DP_BRIDGE_CONFIGURATION_SET, 1, DPCD_WRITE, &buf); - /* semi auto link training mode */ - i2c_writeb(bus, chip, SN_ML_TX_MODE_REG, 0xa); - - if (!wait_ms(500, - !(i2c_readb(bus, chip, SN_ML_TX_MODE_REG, &buf)) && - (buf & NORMAL_MODE))) { - printk(BIOS_ERR, "ERROR: Link training failed"); + int i; /* Kernel driver suggests to retry this up to 10 times if it fails. */ + for (i = 0; i < 10; i++) { + i2c_writeb(bus, chip, SN_ML_TX_MODE_REG, SEMI_AUTO_LINK_TRAINING); + + if (!wait_ms(500, !(i2c_readb(bus, chip, SN_ML_TX_MODE_REG, &buf)) && + (buf == NORMAL_MODE || buf == MAIN_LINK_OFF))) { + printk(BIOS_ERR, "ERROR: unexpected link training state: %#x\n", buf); + return; + } + if (buf == NORMAL_MODE) + return; } + printk(BIOS_ERR, "ERROR: Link training failed 10 times\n"); } static enum cb_err sn65dsi86_bridge_get_plug_in_status(uint8_t bus, uint8_t chip) |