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path: root/drivers/gpu/drm/radeon/radeon_i2c.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_i2c.c29
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 e71f2eb02ee2..bfd2ce5f5372 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);
+}
+