Validate the modes against available link bandwidth rather than
maximum link bandwidth so that we have a better idea as to whether
a proposed mode can truly run beside existing stream.
v2: Put the Signed-off to the end of the commit message
Cc: dhinakaran.pandiyan@xxxxxxxxx
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp_mst.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 629337d..e7e87d7 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -352,13 +352,23 @@ static enum drm_mode_status
intel_dp_mst_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
+ int req_pbn = 0;
+ int avail_pbn = 0;
+ struct intel_connector *intel_connector = to_intel_connector(connector);
+ struct intel_dp *intel_dp = intel_connector->mst_port;
+ struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr;
+ struct drm_dp_mst_port *port = (struct drm_dp_mst_port *) (intel_connector->port);
int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
- /* TODO - validate mode against available PBN for link */
+ avail_pbn = drm_dp_mst_get_avail_pbn(mgr, port);
+ req_pbn = drm_dp_calc_pbn_mode(mode->clock, 24);
+ if (req_pbn > avail_pbn)
+ return MODE_H_ILLEGAL;
+
if (mode->clock < 10000)
return MODE_CLOCK_LOW;
- if (mode->flags & DRM_MODE_FLAG_DBLCLK)
+ if (mode->flags & DRM_MODE_FLAG_DBLCLK)
return MODE_H_ILLEGAL;
if (mode->clock > max_dotclk)
--
2.7.4
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