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| author | Alex Deucher <alexander.deucher@amd.com> | 2016-05-11 16:21:03 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-18 18:35:15 -0700 |
| commit | e23744bfad9fad9d1991298a449342e6f76dd1a6 (patch) | |
| tree | ad7fb2974d0e59a3cb3dfbd46fe438f88aaa3685 /drivers/gpu | |
| parent | df6ac4bcc9c820841b17b9af0f8c270b54e485cb (diff) | |
| download | linux-stable-e23744bfad9fad9d1991298a449342e6f76dd1a6.tar.gz linux-stable-e23744bfad9fad9d1991298a449342e6f76dd1a6.tar.bz2 linux-stable-e23744bfad9fad9d1991298a449342e6f76dd1a6.zip | |
drm/amdgpu: fix DP mode validation
commit c47b9e0944e483309d66c807d650ac8b8ceafb57 upstream.
Switch the order of the loops to walk the rates on the top
so we exhaust all DP 1.1 rate/lane combinations before trying
DP 1.2 rate/lane combos.
This avoids selecting rates that are supported by the monitor,
but not the connector leading to valid modes getting rejected.
bug:
https://bugs.freedesktop.org/show_bug.cgi?id=95206
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/atombios_dp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c index bf731e9f643e..7f85c2c1d681 100644 --- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c +++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c @@ -276,8 +276,8 @@ static int amdgpu_atombios_dp_get_dp_link_config(struct drm_connector *connector } } } else { - for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { - for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) { + for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) { + for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { max_pix_clock = (lane_num * link_rates[i] * 8) / bpp; if (max_pix_clock >= pix_clock) { *dp_lanes = lane_num; |