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| author | Mykola Lysenko <Mykola.Lysenko@amd.com> | 2015-12-25 11:14:47 +0300 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-02-10 06:56:20 +0300 |
| commit | bc062e19a978e93b296f0b471314ed97735880fe (patch) | |
| tree | bd7b3a1a6a5129c13df0b1059cdc2aea837b32c5 /drivers/gpu | |
| parent | cdfaa058808a5476352558981d4cbe1c9e08492c (diff) | |
| download | linux-bc062e19a978e93b296f0b471314ed97735880fe.tar.xz | |
drm/dp/mst: fix in MSTB RAD initialization
[ Upstream commit 75af4c8c4c0f60d7ad135419805798f144e9baf9 ]
This fix is needed to support more then two
branch displays, so RAD address consist at
least of 2 elements
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Mykola Lysenko <Mykola.Lysenko@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index a42985530e4a..5518c632cf2b 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -956,17 +956,17 @@ static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, u8 *rad) { - int lct = port->parent->lct; + int parent_lct = port->parent->lct; int shift = 4; - int idx = lct / 2; - if (lct > 1) { - memcpy(rad, port->parent->rad, idx); - shift = (lct % 2) ? 4 : 0; + int idx = (parent_lct - 1) / 2; + if (parent_lct > 1) { + memcpy(rad, port->parent->rad, idx + 1); + shift = (parent_lct % 2) ? 4 : 0; } else rad[0] = 0; rad[idx] |= port->port_num << shift; - return lct + 1; + return parent_lct + 1; } /* |