@@ -384,6 +384,19 @@ 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.
@@ -393,7 +406,7 @@ 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;
@@ -431,7 +444,7 @@ 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,
This is a note to let you know that I have just added a patch titled drm/radeon/dp: fix lane/clock setup for dp 1.2 capable devices to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.11.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From 8c91c647d1ca2c501a1f53a39f6e7e530634c99d Mon Sep 17 00:00:00 2001 From: Alex Deucher <alexander.deucher@amd.com> Date: Tue, 27 May 2014 13:48:05 -0400 Subject: drm/radeon/dp: fix lane/clock setup for dp 1.2 capable devices commit 3b6d9fd23e015b5397c438fd3cd74147d2c805b6 upstream. Only DCE5+ asics support DP 1.2. Noticed by ArtForz on IRC. Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/gpu/drm/radeon/atombios_dp.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) -- 1.9.1