leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/radeon/dp: fix lane/clock setup for dp 1.2 capable devices

Browse Source 
Only DCE5+ asics support DP 1.2.

Noticed by ArtForz on IRC.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2014-05-27 13:48:05 -04:00
parent af5d36539d
commit 3b6d9fd23e
1 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpu/drm/radeon/atombios_dp.c
View File

@ -291,6 +291,19 @@ static int dp_get_max_dp_pix_clock(int link_rate,
/***** radeon specific DP functions *****/
static int radeon_dp_get_max_link_rate(struct drm_connector *connector,
u8 dpcd[DP_DPCD_SIZE])
{
int max_link_rate;
if (radeon_connector_is_dp12_capable(connector))
max_link_rate = min(drm_dp_max_link_rate(dpcd), 540000);
else
max_link_rate = min(drm_dp_max_link_rate(dpcd), 270000);
return max_link_rate;
}
/* First get the min lane# when low rate is used according to pixel clock
* (prefer low rate), second check max lane# supported by DP panel,
* if the max lane# < low rate lane# then use max lane# instead.
@ -300,7 +313,7 @@ static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
int pix_clock)
{
int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
int max_link_rate = drm_dp_max_link_rate(dpcd);
int max_link_rate = radeon_dp_get_max_link_rate(connector, dpcd);
int max_lane_num = drm_dp_max_lane_count(dpcd);
int lane_num;
int max_dp_pix_clock;
@ -338,7 +351,7 @@ static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
return 540000;
}
return drm_dp_max_link_rate(dpcd);
return radeon_dp_get_max_link_rate(connector, dpcd);
}
static u8 radeon_dp_encoder_service(struct radeon_device *rdev,