diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_i2c.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c index e71f2eb..bfd2ce5 100644 --- a/drivers/gpu/drm/radeon/radeon_i2c.c +++ b/drivers/gpu/drm/radeon/radeon_i2c.c @@ -52,6 +52,10 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector) } }; + /* on hw with routers, select right port */ + if (radeon_connector->router.valid) + radeon_router_select_port(radeon_connector); + ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2); if (ret == 2) return true; @@ -1073,3 +1077,28 @@ void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus, addr, val); } +/* router switching */ +void radeon_router_select_port(struct radeon_connector *radeon_connector) +{ + u8 val; + + if (!radeon_connector->router.valid) + return; + + radeon_i2c_get_byte(radeon_connector->router_bus, + radeon_connector->router.i2c_addr, + 0x3, &val); + val &= radeon_connector->router.mux_control_pin; + radeon_i2c_put_byte(radeon_connector->router_bus, + radeon_connector->router.i2c_addr, + 0x3, val); + radeon_i2c_get_byte(radeon_connector->router_bus, + radeon_connector->router.i2c_addr, + 0x1, &val); + val &= radeon_connector->router.mux_control_pin; + val |= radeon_connector->router.mux_state; + radeon_i2c_put_byte(radeon_connector->router_bus, + radeon_connector->router.i2c_addr, + 0x1, val); +} + |