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| author | Alex Deucher <alexander.deucher@amd.com> | 2016-05-11 16:16:53 -0400 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-05-17 13:43:12 -0400 |
| commit | 6bdf63fe8999171e65f6b65bf837d3c5f8571da1 (patch) | |
| tree | a4d7270ce98fa5560374bdbf42679804b51ff445 | |
| parent | 3a1b9a74de5c10995d1fd842e3d2344d4e826ae1 (diff) | |
| download | lwn-6bdf63fe8999171e65f6b65bf837d3c5f8571da1.tar.gz lwn-6bdf63fe8999171e65f6b65bf837d3c5f8571da1.zip | |
drm/radeon: fix DP mode validation
[ Upstream commit ff0bd441bdfbfa09d05fdba9829a0401a46635c1 ]
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>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | drivers/gpu/drm/radeon/atombios_dp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c index 7ac42d063574..c868acb47e03 100644 --- a/drivers/gpu/drm/radeon/atombios_dp.c +++ b/drivers/gpu/drm/radeon/atombios_dp.c @@ -325,8 +325,8 @@ int radeon_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; |