drm/radeon/atom: Send out the full AUX address

AUX addresses are 20 bits long. Send out the entire address instead of
just the low 16 bits.

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index f81e0d7d0232..9cd49c584263 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -171,8 +171,9 @@ radeon_dp_aux_transfer_atom(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
                 return -E2BIG;
 
         tx_buf[0] = msg->address & 0xff;
-        tx_buf[1] = msg->address >> 8;
-        tx_buf[2] = msg->request << 4;
+        tx_buf[1] = (msg->address >> 8) & 0xff;
+        tx_buf[2] = (msg->request << 4) |
+                ((msg->address >> 16) & 0xf);
         tx_buf[3] = msg->size ? (msg->size - 1) : 0;
 
         switch (msg->request & ~DP_AUX_I2C_MOT) {